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物含妙理总堪寻分享 http://blog.sciencenet.cn/u/jixuanhou

博文

三论“下雪的时候比较冷，还是化雪的时候比较冷？”

已有 7057 次阅读 2009-12-22 23:55 |个人分类:科学视角|系统分类:科普集锦| 温度, 湿度, 下雪, 化雪, 冷热

    在鄙人发表博文《下雪的时候比较冷，还是化雪的时候比较冷？》以后，许多博友纷纷发表评论和博文来讨论这个问题，例如【1-5】。鄙人也再次发表博文《再论“下雪的时候比较冷，还是化雪的时候比较冷？”》，来进一步阐述自己的观点，也改正了一些错误。在这里先要着重说明的是，这本身是一个非平衡的问题，不能简单的运用平衡态的结论来讨论。然而以上的讨论都仅仅停留在理论阶段，并没有提供实际观测数据，有一点“纸上谈兵”的意味，因此我想利用实际数据和本人实际感受来谈谈这个问题。恰好最近欧洲普降大雪，鄙人所在的城市里昂也没有幸免，而昨天和今天气温回升，积雪已经融化，所以刚好提供了一次亲身实践机会。（最近各国首脑都聚集哥本哈根讨论如何应对温室效应，讽刺的是与此同时欧洲很多地方火车都因为大雪而晚点甚至停运，欧洲人要在冰天雪地中关注这次盛会。）

    首先把最近几天的天气状况用图表示出来：



可以看到降雪主要集中在12月18号到20号三天，而化雪过程在21号一天就基本完成。降雪之前，也就是17号之前气温都一直维持在华氏30度（摄氏-1度），而降雪期间气温骤降，最低跌至华氏14度（摄氏-10度）。降雪的后一天，也就是化雪的一天，21号，气温急剧回升，到21号夜里已经回升到华氏50度（摄氏10度）。在本文最后会列出这几天天气的实际测量数据。 【数据来自网站http://www.timeanddate.com/weather/france/lyon/historic?hd=20091214 】

    再说说人体感觉。下雪三天（18到20号）感觉非常寒冷。在室内暖气片已经烫手了，但是还是感觉冷。出门穿着羽绒服还是被冻得哆哆嗦嗦的，可以说是寒风刺骨。但是化雪天（21号）感觉不再寒冷了，虽然风很大，但是没有刺骨的感觉，甚至不需要穿羽绒服了。需要说明的是，不光是我一个人的感觉如此，我也问询了我周围的邻居，他们和我的感受是一样的。（说明鄙人不是有特异体质的人，也没有精神上的问题！）

    因此从这次的降雪和融雪过程来看，不论是物理上的“冷热”(也就是温度)，还是人体感受到的“冷热”，都是降雪冷，而化雪不冷。也至少说明“下雪不冷化雪冷”的谚语并不总是成立。或许有人会争论说我这里所说的事实只是个别情况，统计上来说“下雪不冷化雪冷”的谚语还是在大部分情况下成立的。我对此的回答是：“实践是检验真理的唯一标准”，我在这里是用事实说话的，而不是空口无凭的论证。如果要说统计上的问题，那么请给出多次的测量的结果，给出多次下雪化雪的实际数据。我个人认为我这篇博文是在众博文中最站得住脚的。

    另外还要指出，谚语并不一定是科学的归纳总结，因为人的心里因素也很重要。人会把出乎意料或者不好的事情记得特别清晰。例如，有人在书房打牌输了几次钱，输钱总是记忆深刻，而赢钱记忆不深刻，他就有可能会说：“在书(输)房打牌一定输钱”。对于下雪化雪问题也是一样，“下雪不冷化雪冷”算是一个出乎意料的结果，因此偶尔发生了这样的状况也可能让人记忆深刻，得出这样的结论。

    值得说明的是，本问题已经超越了下雪化雪冷热这样一个狭隘命题，而最有意义的是让大家知道中学课本上所谓的“标准答案”，并不一定标准，甚至有可能是荒谬的。强调了“质疑精神”重要性。

    以下是里昂12月15号到22号的气象数据（每半小时记录一次）：

Detailed list of observations in Lyon / Bron

Expand/Collapse Detailed list for all week

          Wind      
Date Time Weather Weather Temp Speed Dir. Hum. Barometer Visibility
Expand/Collapse Weather on 15 Déc                  
Dec 15 3:00 PM Overcast. Chilly. Overcast. Chilly. 30 °F 10 mph Direction South 69% 29.86 "Hg N/A
Dec 15 4:00 PM Overcast. Chilly. Overcast. Chilly. 30 °F 12 mph Direction South 69% 29.86 "Hg N/A
Dec 15 5:00 PM Overcast. Chilly. Overcast. Chilly. 30 °F 13 mph Direction South-southeast 64% 29.86 "Hg N/A
Dec 15 6:00 PM Overcast. Chilly. Overcast. Chilly. 30 °F 10 mph Direction South 64% 29.86 "Hg N/A
Dec 15 6:30 PM Overcast. Chilly. Overcast. Chilly. 30 °F 13 mph Direction South-southeast 64% 29.86 "Hg N/A
Dec 15 7:00 PM Overcast. Chilly. Overcast. Chilly. 30 °F 12 mph Direction South-southeast 64% 29.89 "Hg N/A
Dec 15 7:30 PM Overcast. Chilly. Overcast. Chilly. 30 °F 12 mph Direction South-southeast 64% 29.86 "Hg N/A
Dec 15 8:00 PM Overcast. Chilly. Overcast. Chilly. 30 °F 13 mph Direction South-southeast 64% 29.86 "Hg N/A
Dec 15 8:30 PM Overcast. Chilly. Overcast. Chilly. 30 °F 13 mph Direction South-southeast 64% 29.86 "Hg N/A
Dec 15 9:00 PM Passing clouds. Chilly. Passing clouds. Chilly. 30 °F 13 mph Direction South-southeast 64% 29.86 "Hg N/A
Dec 15 9:30 PM Overcast. Chilly. Overcast. Chilly. 30 °F 14 mph Direction South-southeast 64% 29.86 "Hg N/A
Dec 15 10:00 PM Overcast. Chilly. Overcast. Chilly. 30 °F 10 mph Direction South-southeast 64% 29.86 "Hg N/A
Dec 15 10:30 PM Overcast. Chilly. Overcast. Chilly. 30 °F 12 mph Direction South-southeast 64% 29.86 "Hg N/A
Dec 15 11:00 PM Overcast. Chilly. Overcast. Chilly. 30 °F 13 mph Direction Southeast 64% 29.86 "Hg N/A
Dec 15 11:30 PM Overcast. Chilly. Overcast. Chilly. 30 °F 15 mph Direction South-southeast 64% 29.89 "Hg N/A
Expand/Collapse Weather on 16 Déc                  
Dec 16 12:00 Midnight Overcast. Chilly. Overcast. Chilly. 30 °F 10 mph Direction South-southeast 64% 29.89 "Hg N/A
Dec 16 12:30 AM Overcast. Chilly. Overcast. Chilly. 30 °F 12 mph Direction South-southeast 64% 29.89 "Hg N/A
Dec 16 1:00 AM Overcast. Chilly. Overcast. Chilly. 30 °F 9 mph Direction South-southeast 64% 29.89 "Hg N/A
Dec 16 1:30 AM Overcast. Chilly. Overcast. Chilly. 30 °F 12 mph Direction South-southeast 64% 29.89 "Hg N/A
Dec 16 2:00 AM Overcast. Chilly. Overcast. Chilly. 30 °F 12 mph Direction South-southeast 64% 29.89 "Hg N/A
Dec 16 2:30 AM Overcast. Chilly. Overcast. Chilly. 30 °F 10 mph Direction South-southeast 64% 29.89 "Hg N/A
Dec 16 3:00 AM Overcast. Chilly. Overcast. Chilly. 30 °F 13 mph Direction South-southeast 64% 29.89 "Hg N/A
Dec 16 3:30 AM Overcast. Chilly. Overcast. Chilly. 30 °F 14 mph Direction South-southeast 64% 29.89 "Hg N/A
Dec 16 4:00 AM Overcast. Chilly. Overcast. Chilly. 30 °F 12 mph Direction South-southeast 64% 29.89 "Hg N/A
Dec 16 4:30 AM Overcast. Chilly. Overcast. Chilly. 30 °F 12 mph Direction South-southeast 59% 29.89 "Hg N/A
Dec 16 5:00 AM Overcast. Chilly. Overcast. Chilly. 30 °F 12 mph Direction South 64% 29.86 "Hg N/A
Dec 16 5:30 AM Overcast. Chilly. Overcast. Chilly. 30 °F 13 mph Direction South-southeast 64% 29.86 "Hg N/A
Dec 16 6:00 AM Passing clouds. Chilly. Passing clouds. Chilly. 30 °F 13 mph Direction South-southeast 64% 29.86 "Hg N/A
Dec 16 7:00 AM Passing clouds. Chilly. Passing clouds. Chilly. 30 °F 8 mph Direction South-southeast 59% 29.83 "Hg N/A
Dec 16 8:00 AM Passing clouds. Chilly. Passing clouds. Chilly. 30 °F 9 mph Direction South 64% 29.83 "Hg N/A
Dec 16 9:00 AM Partly sunny. Chilly. Partly sunny. Chilly. 30 °F 10 mph Direction South-southeast 64% 29.86 "Hg N/A
Dec 16 10:00 AM Light snow. Partly sunny. Chilly. Light snow. Partly sunny. Chilly. 30 °F 12 mph Direction South-southeast 64% 29.86 "Hg N/A
Dec 16 11:00 AM Partly sunny. Chilly. Partly sunny. Chilly. 30 °F 13 mph Direction South-southeast 59% 29.86 "Hg N/A
Dec 16 12:00 Noon Light snow. Partly sunny. Chilly. Light snow. Partly sunny. Chilly. 30 °F 9 mph Direction South-southeast 64% 29.83 "Hg N/A
Dec 16 1:00 PM Broken clouds. Chilly. Broken clouds. Chilly. 30 °F 8 mph Direction South 64% 29.80 "Hg N/A
Dec 16 2:00 PM Broken clouds. Chilly. Broken clouds. Chilly. 30 °F 7 mph Direction South 69% 29.77 "Hg N/A
Dec 16 3:00 PM Broken clouds. Chilly. Broken clouds. Chilly. 30 °F 8 mph Direction South-southeast 69% 29.77 "Hg N/A
Dec 16 4:00 PM Light snow. Broken clouds. Chilly. Light snow. Broken clouds. Chilly. 30 °F 7 mph Direction South 69% 29.77 "Hg N/A
Dec 16 5:00 PM Partly cloudy. Chilly. Partly cloudy. Chilly. 30 °F 8 mph Direction South 75% 29.77 "Hg N/A
Dec 16 6:00 PM Overcast. Chilly. Overcast. Chilly. 30 °F 8 mph Direction South 75% 29.77 "Hg N/A
Dec 16 6:30 PM Overcast. Chilly. Overcast. Chilly. 30 °F 9 mph Direction South-southeast 75% 29.77 "Hg N/A
Dec 16 7:00 PM Overcast. Chilly. Overcast. Chilly. 30 °F 9 mph Direction South-southeast 75% 29.77 "Hg N/A
Dec 16 7:30 PM Overcast. Chilly. Overcast. Chilly. 30 °F 9 mph Direction South-southeast 75% 29.77 "Hg N/A
Dec 16 8:00 PM Overcast. Chilly. Overcast. Chilly. 30 °F 8 mph Direction South-southeast 75% 29.77 "Hg N/A
Dec 16 8:30 PM Overcast. Chilly. Overcast. Chilly. 30 °F 9 mph Direction South-southeast 75% 29.77 "Hg N/A
Dec 16 9:00 PM Partly cloudy. Chilly. Partly cloudy. Chilly. 30 °F 8 mph Direction South-southeast 80% 29.77 "Hg N/A
Dec 16 9:30 PM Passing clouds. Chilly. Passing clouds. Chilly. 30 °F 6 mph Direction South-southeast 80% 29.77 "Hg 5 mi
Dec 16 10:00 PM Passing clouds. Chilly. Passing clouds. Chilly. 30 °F 6 mph Direction South 80% 29.77 "Hg 6 mi
Dec 16 10:30 PM Passing clouds. Chilly. Passing clouds. Chilly. 30 °F 5 mph Direction South 80% 29.77 "Hg 6 mi
Dec 16 11:00 PM Passing clouds. Chilly. Passing clouds. Chilly. 30 °F 6 mph Direction South 80% 29.77 "Hg N/A
Dec 16 11:30 PM Passing clouds. Chilly. Passing clouds. Chilly. 30 °F 8 mph Direction South 80% 29.77 "Hg 6 mi
Expand/Collapse Weather on 17 Déc                  
Dec 17 12:00 Midnight Light snow. Passing clouds. Chilly. Light snow. Passing clouds. Chilly. 30 °F 8 mph Direction South-southeast 80% 29.77 "Hg 5 mi
Dec 17 12:30 AM Passing clouds. Chilly. Passing clouds. Chilly. 30 °F 8 mph Direction South-southeast 80% 29.77 "Hg N/A
Dec 17 1:00 AM Passing clouds. Chilly. Passing clouds. Chilly. 30 °F 8 mph Direction South-southeast 80% 29.77 "Hg N/A
Dec 17 1:30 AM Passing clouds. Chilly. Passing clouds. Chilly. 30 °F 9 mph Direction South 80% 29.77 "Hg N/A
Dec 17 2:00 AM Passing clouds. Chilly. Passing clouds. Chilly. 30 °F 10 mph Direction South 80% 29.74 "Hg N/A
Dec 17 2:30 AM Passing clouds. Chilly. Passing clouds. Chilly. 30 °F 10 mph Direction South 80% 29.74 "Hg N/A
Dec 17 3:00 AM Passing clouds. Chilly. Passing clouds. Chilly. 30 °F 9 mph Direction South 80% 29.77 "Hg N/A
Dec 17 3:30 AM Passing clouds. Chilly. Passing clouds. Chilly. 30 °F 12 mph Direction South 80% 29.77 "Hg N/A
Dec 17 4:00 AM Mostly cloudy. Chilly. Mostly cloudy. Chilly. 30 °F 8 mph Direction South 80% 29.77 "Hg N/A
Dec 17 4:30 AM Mostly cloudy. Chilly. Mostly cloudy. Chilly. 30 °F 9 mph Direction South 80% 29.77 "Hg N/A
Dec 17 5:00 AM Passing clouds. Chilly. Passing clouds. Chilly. 28 °F 12 mph Direction South-southeast 86% 29.77 "Hg N/A
Dec 17 5:30 AM Passing clouds. Chilly. Passing clouds. Chilly. 28 °F 9 mph Direction South 86% 29.77 "Hg N/A
Dec 17 6:00 AM Light snow. Passing clouds. Chilly. Light snow. Passing clouds. Chilly. 30 °F 10 mph Direction South 80% 29.77 "Hg 6 mi
Dec 17 7:00 AM Light snow. Partly cloudy. Chilly. Light snow. Partly cloudy. Chilly. 30 °F 9 mph Direction South 75% 29.77 "Hg 6 mi
Dec 17 8:00 AM Partly cloudy. Chilly. Partly cloudy. Chilly. 30 °F 9 mph Direction South 75% 29.77 "Hg N/A
Dec 17 9:00 AM Partly sunny. Chilly. Partly sunny. Chilly. 28 °F 7 mph Direction South 74% 29.80 "Hg N/A
Dec 17 10:00 AM Partly sunny. Chilly. Partly sunny. Chilly. 30 °F 8 mph Direction South 69% 29.80 "Hg N/A
Dec 17 11:00 AM Scattered clouds. Chilly. Scattered clouds. Chilly. 30 °F 9 mph Direction South 59% 29.80 "Hg N/A
Dec 17 12:00 Noon Scattered clouds. Chilly. Scattered clouds. Chilly. 32 °F 9 mph Direction South 51% 29.80 "Hg N/A
Dec 17 1:00 PM Passing clouds. Chilly. Passing clouds. Chilly. 34 °F 9 mph Direction South-southwest 48% 29.80 "Hg N/A
Dec 17 2:00 PM Scattered clouds. Chilly. Scattered clouds. Chilly. 32 °F 13 mph Direction South 47% 29.80 "Hg N/A
Dec 17 3:00 PM Partly sunny. Chilly. Partly sunny. Chilly. 32 °F 8 mph Direction South 47% 29.80 "Hg N/A
Dec 17 4:00 PM Partly sunny. Chilly. Partly sunny. Chilly. 32 °F 7 mph Direction South 51% 29.80 "Hg N/A
Dec 17 5:00 PM Partly cloudy. Chilly. Partly cloudy. Chilly. 30 °F 3 mph Direction South 55% 29.80 "Hg N/A
Dec 17 6:00 PM Passing clouds. Chilly. Passing clouds. Chilly. 30 °F No wind - 55% 29.80 "Hg N/A
Dec 17 6:30 PM Clear. Chilly. Clear. Chilly. 30 °F 3 mph Direction East 59% 29.80 "Hg N/A
Dec 17 7:00 PM Light snow. Ice fog. Chilly. Light snow. Ice fog. Chilly. 30 °F 3 mph Direction East-northeast 69% 29.80 "Hg 1 mi
Dec 17 7:30 PM Light snow. Passing clouds. Chilly. Light snow. Passing clouds. Chilly. 28 °F 3 mph Direction North-northeast 80% 29.80 "Hg N/A
Dec 17 8:00 PM Light snow. Ice fog. Chilly. Light snow. Ice fog. Chilly. 28 °F 3 mph Direction North 86% 29.80 "Hg 2 mi
Dec 17 8:30 PM Passing clouds. Chilly. Passing clouds. Chilly. 28 °F 3 mph Direction North 86% 29.77 "Hg N/A
Dec 17 9:00 PM Light snow. Passing clouds. Chilly. Light snow. Passing clouds. Chilly. 28 °F 3 mph Direction North-northwest 86% 29.77 "Hg 6 mi
Dec 17 9:30 PM Light snow. Ice fog. Chilly. Light snow. Ice fog. Chilly. 28 °F 3 mph Direction North 86% 29.77 "Hg 3 mi
Dec 17 10:00 PM Passing clouds. Chilly. Passing clouds. Chilly. 28 °F 6 mph Direction North 80% 29.77 "Hg N/A
Dec 17 10:30 PM Low clouds. Chilly. Low clouds. Chilly. 28 °F 5 mph Direction North 86% 29.77 "Hg N/A
Dec 17 11:00 PM Overcast. Chilly. Overcast. Chilly. 28 °F 3 mph Direction North-northwest 86% 29.77 "Hg N/A
Dec 17 11:30 PM Overcast. Chilly. Overcast. Chilly. 28 °F 6 mph Direction North 86% 29.77 "Hg N/A
Expand/Collapse Weather on 18 Déc                  
Dec 18 12:00 Midnight Overcast. Chilly. Overcast. Chilly. 28 °F 6 mph Direction North 86% 29.74 "Hg N/A
Dec 18 12:30 AM Overcast. Chilly. Overcast. Chilly. 28 °F 5 mph Direction North 86% 29.74 "Hg N/A
Dec 18 1:00 AM Overcast. Chilly. Overcast. Chilly. 28 °F 5 mph Direction North-northwest 86% 29.74 "Hg N/A
Dec 18 1:30 AM Overcast. Chilly. Overcast. Chilly. 28 °F 5 mph Direction North 86% 29.74 "Hg N/A
Dec 18 2:00 AM Light snow. Overcast. Chilly. Light snow. Overcast. Chilly. 28 °F 7 mph Direction North 86% 29.71 "Hg N/A
Dec 18 2:30 AM Light snow. Ice fog. Chilly. Light snow. Ice fog. Chilly. 28 °F 6 mph Direction North 86% 29.71 "Hg 2 mi
Dec 18 3:00 AM Light snow. Ice fog. Chilly. Light snow. Ice fog. Chilly. 28 °F 3 mph Direction North 93% 29.71 "Hg 1 mi
Dec 18 3:30 AM Light snow. Ice fog. Chilly. Light snow. Ice fog. Chilly. 28 °F 5 mph Direction North 93% 29.71 "Hg 1 mi
Dec 18 4:00 AM Light snow. Ice fog. Chilly. Light snow. Ice fog. Chilly. 28 °F 3 mph Direction Northwest 93% 29.68 "Hg 1 mi
Dec 18 4:30 AM Light snow. Ice fog. Chilly. Light snow. Ice fog. Chilly. 28 °F 3 mph Direction North 93% 29.68 "Hg 1 mi
Dec 18 5:00 AM Light snow. Ice fog. Chilly. Light snow. Ice fog. Chilly. 28 °F 3 mph Direction North-northwest 93% 29.65 "Hg 3 mi
Dec 18 5:30 AM Overcast. Chilly. Overcast. Chilly. 28 °F 1 mph Direction South 93% 29.65 "Hg 4 mi
Dec 18 6:00 AM Partly cloudy. Chilly. Partly cloudy. Chilly. 28 °F No wind - 93% 29.65 "Hg 4 mi
Dec 18 7:00 AM Passing clouds. Chilly. Passing clouds. Chilly. 28 °F 2 mph Direction Northwest 93% 29.65 "Hg 4 mi
Dec 18 8:00 AM Passing clouds. Chilly. Passing clouds. Chilly. 28 °F 6 mph Direction North 93% 29.62 "Hg 4 mi
Dec 18 9:00 AM Partly sunny. Chilly. Partly sunny. Chilly. 28 °F No wind - 93% 29.62 "Hg 4 mi
Dec 18 10:00 AM Scattered showers. Partly sunny. Chilly. Scattered showers. Partly sunny. Chilly. 30 °F No wind - 86% 29.62 "Hg 4 mi
Dec 18 11:00 AM Light snow. Ice fog. Chilly. Light snow. Ice fog. Chilly. 32 °F No wind - 87% 29.62 "Hg 2 mi
Dec 18 12:00 Noon Light snow. Ice fog. Chilly. Light snow. Ice fog. Chilly. 30 °F 3 mph Direction North 93% 29.62 "Hg 1 mi
Dec 18 1:00 PM Light snow. Ice fog. Chilly. Light snow. Ice fog. Chilly. 32 °F 3 mph Direction North-northwest 93% 29.59 "Hg 1 mi
Dec 18 2:00 PM Partly sunny. Chilly. Partly sunny. Chilly. 34 °F 2 mph Direction South 87% 29.56 "Hg 3 mi
Dec 18 3:00 PM Partly sunny. Chilly. Partly sunny. Chilly. 34 °F 2 mph Direction South 87% 29.59 "Hg 3 mi
Dec 18 4:00 PM Light snow. Fog. Chilly. Light snow. Fog. Chilly. 34 °F 3 mph Direction East-southeast 87% 29.59 "Hg N/A
Dec 18 5:00 PM Snow. Fog. Chilly. Snow. Fog. Chilly. 32 °F 6 mph Direction South 93% 29.59 "Hg 0 mi
Dec 18 6:00 PM Partly cloudy. Chilly. Partly cloudy. Chilly. 32 °F 5 mph Direction South-southeast 93% 29.59 "Hg 6 mi
Dec 18 6:30 PM Passing clouds. Chilly. Passing clouds. Chilly. 32 °F 3 mph Direction East-southeast 87% 29.62 "Hg N/A
Dec 18 7:00 PM Light snow. Passing clouds. Chilly. Light snow. Passing clouds. Chilly. 30 °F 13 mph Direction Southeast 93% 29.62 "Hg N/A
Dec 18 7:30 PM Light snow. Passing clouds. Chilly. Light snow. Passing clouds. Chilly. 30 °F 9 mph Direction Southeast 93% 29.62 "Hg N/A
Dec 18 8:00 PM Light snow. Partly cloudy. Chilly. Light snow. Partly cloudy. Chilly. 30 °F 10 mph Direction Southeast 86% 29.62 "Hg 4 mi
Dec 18 8:30 PM Light snow. Ice fog. Chilly. Light snow. Ice fog. Chilly. 30 °F 9 mph Direction Southeast 86% 29.62 "Hg 3 mi
Dec 18 9:00 PM Light snow. Ice fog. Chilly. Light snow. Ice fog. Chilly. 28 °F 7 mph Direction Southeast 93% 29.62 "Hg 3 mi
Dec 18 9:30 PM Light snow. Ice fog. Chilly. Light snow. Ice fog. Chilly. 28 °F 10 mph Direction Southeast 93% 29.62 "Hg 3 mi
Dec 18 10:00 PM Light snow. Ice fog. Chilly. Light snow. Ice fog. Chilly. 28 °F 9 mph Direction Southeast 93% 29.62 "Hg 2 mi
Dec 18 10:30 PM Light snow. Ice fog. Chilly. Light snow. Ice fog. Chilly. 28 °F 9 mph Direction South 93% 29.62 "Hg 2 mi
Dec 18 11:00 PM Light snow. Mostly cloudy. Chilly. Light snow. Mostly cloudy. Chilly. 28 °F 16 mph Direction South-southeast 93% 29.65 "Hg 4 mi
Dec 18 11:30 PM Overcast. Chilly. Overcast. Chilly. 28 °F 17 mph Direction South-southeast 86% 29.65 "Hg 6 mi
Expand/Collapse Weather on 19 Déc                  
Dec 19 12:00 Midnight Overcast. Chilly. Overcast. Chilly. 28 °F 17 mph Direction South-southeast 80% 29.65 "Hg N/A
Dec 19 12:30 AM Mostly cloudy. Chilly. Mostly cloudy. Chilly. 27 °F 15 mph Direction South 80% 29.65 "Hg N/A
Dec 19 1:00 AM Passing clouds. Chilly. Passing clouds. Chilly. 27 °F 14 mph Direction South 80% 29.65 "Hg N/A
Dec 19 1:30 AM Partly cloudy. Chilly. Partly cloudy. Chilly. 27 °F 16 mph Direction South-southeast 80% 29.68 "Hg N/A
Dec 19 2:00 AM Clear. Chilly. Clear. Chilly. 27 °F 17 mph Direction South-southeast 74% 29.68 "Hg N/A
Dec 19 2:30 AM Clear. Cold. Clear. Cold. 25 °F 17 mph Direction South 80% 29.68 "Hg N/A
Dec 19 3:00 AM Clear. Cold. Clear. Cold. 25 °F 15 mph Direction South-southeast 74% 29.71 "Hg N/A
Dec 19 3:30 AM Passing clouds. Cold. Passing clouds. Cold. 25 °F 9 mph Direction South 74% 29.71 "Hg N/A
Dec 19 4:00 AM Passing clouds. Cold. Passing clouds. Cold. 25 °F 12 mph Direction South 74% 29.71 "Hg N/A
Dec 19 4:30 AM Passing clouds. Cold. Passing clouds. Cold. 25 °F 13 mph Direction South-southeast 80% 29.71 "Hg N/A
Dec 19 5:00 AM Passing clouds. Cold. Passing clouds. Cold. 25 °F 14 mph Direction South 80% 29.71 "Hg N/A
Dec 19 6:00 AM Passing clouds. Cold. Passing clouds. Cold. 25 °F 13 mph Direction South 80% 29.71 "Hg N/A
Dec 19 7:00 AM Light snow. Passing clouds. Cold. Light snow. Passing clouds. Cold. 25 °F 12 mph Direction South 80% 29.71 "Hg N/A
Dec 19 8:00 AM Light snow. Passing clouds. Cold. Light snow. Passing clouds. Cold. 25 °F 7 mph Direction South 80% 29.71 "Hg 4 mi
Dec 19 9:00 AM Partly sunny. Cold. Partly sunny. Cold. 21 °F 7 mph Direction East-southeast 86% 29.74 "Hg 4 mi
Dec 19 10:00 AM Light snow. Partly sunny. Cold. Light snow. Partly sunny. Cold. 23 °F 8 mph Direction East-southeast 80% 29.74 "Hg 4 mi
Dec 19 11:00 AM Light snow. Ice fog. Cold. Light snow. Ice fog. Cold. 23 °F 9 mph Direction Southeast 86% 29.74 "Hg 1 mi
Dec 19 12:00 Noon Light snow. Ice fog. Cold. Light snow. Ice fog. Cold. 23 °F 3 mph Direction South 86% 29.74 "Hg 2 mi
Dec 19 1:00 PM Light snow. Ice fog. Cold. Light snow. Ice fog. Cold. 23 °F 3 mph Direction South 93% 29.74 "Hg 1 mi
Dec 19 2:00 PM Light snow. Broken clouds. Cold. Light snow. Broken clouds. Cold. 25 °F 17 mph Direction South-southeast 69% 29.71 "Hg 4 mi
Dec 19 3:00 PM Light snow. Partly sunny. Cold. Light snow. Partly sunny. Cold. 25 °F 13 mph Direction South 69% 29.74 "Hg N/A
Dec 19 4:00 PM Light snow. Partly sunny. Cold. Light snow. Partly sunny. Cold. 25 °F 12 mph Direction South 74% 29.77 "Hg 5 mi
Dec 19 5:00 PM Light snow. Passing clouds. Cold. Light snow. Passing clouds. Cold. 23 °F 7 mph Direction South-southwest 86% 29.77 "Hg 4 mi
Dec 19 6:00 PM Overcast. Cold. Overcast. Cold. 23 °F 7 mph Direction South 80% 29.80 "Hg N/A
Dec 19 6:30 PM Overcast. Cold. Overcast. Cold. 23 °F 9 mph Direction South 80% 29.80 "Hg N/A
Dec 19 7:00 PM Overcast. Cold. Overcast. Cold. 23 °F 7 mph Direction South 74% 29.83 "Hg N/A
Dec 19 7:30 PM Overcast. Cold. Overcast. Cold. 23 °F 9 mph Direction South 74% 29.83 "Hg N/A
Dec 19 8:00 PM Mostly cloudy. Cold. Mostly cloudy. Cold. 21 °F 8 mph Direction South 74% 29.83 "Hg N/A
Dec 19 8:30 PM Mostly cloudy. Cold. Mostly cloudy. Cold. 21 °F 7 mph Direction South-southwest 74% 29.86 "Hg N/A
Dec 19 9:00 PM Overcast. Cold. Overcast. Cold. 21 °F 6 mph Direction Southwest 74% 29.86 "Hg N/A
Dec 19 9:30 PM Overcast. Cold. Overcast. Cold. 19 °F 10 mph Direction Southwest 73% 29.86 "Hg N/A
Dec 19 10:00 PM Passing clouds. Cold. Passing clouds. Cold. 19 °F 8 mph Direction South-southwest 73% 29.86 "Hg N/A
Dec 19 10:30 PM Passing clouds. Cold. Passing clouds. Cold. 19 °F 3 mph Direction South-southwest 73% 29.89 "Hg N/A
Dec 19 11:00 PM Passing clouds. Cold. Passing clouds. Cold. 19 °F 6 mph Direction South 73% 29.89 "Hg N/A
Dec 19 11:30 PM Passing clouds. Cold. Passing clouds. Cold. 18 °F 5 mph Direction South 79% 29.89 "Hg N/A
Expand/Collapse Weather on 20 Déc                  
Dec 20 12:00 Midnight Low clouds. Cold. Low clouds. Cold. 19 °F 3 mph Direction South 79% 29.89 "Hg N/A
Dec 20 12:30 AM Overcast. Cold. Overcast. Cold. 19 °F 3 mph Direction South-southwest 79% 29.89 "Hg N/A
Dec 20 1:00 AM Overcast. Cold. Overcast. Cold. 19 °F 2 mph Direction Southwest 79% 29.89 "Hg N/A
Dec 20 1:30 AM Overcast. Cold. Overcast. Cold. 19 °F No wind - 73% 29.89 "Hg N/A
Dec 20 2:00 AM Overcast. Cold. Overcast. Cold. 19 °F 3 mph Direction West-northwest 79% 29.92 "Hg N/A
Dec 20 2:30 AM Overcast. Cold. Overcast. Cold. 18 °F 3 mph Direction West-northwest 86% 29.92 "Hg N/A
Dec 20 3:00 AM Overcast. Cold. Overcast. Cold. 18 °F 5 mph Direction West 86% 29.92 "Hg N/A
Dec 20 3:30 AM Overcast. Cold. Overcast. Cold. 18 °F 3 mph Direction West-southwest 86% 29.92 "Hg N/A
Dec 20 4:00 AM Overcast. Cold. Overcast. Cold. 18 °F 1 mph Direction West 86% 29.92 "Hg N/A
Dec 20 4:30 AM Overcast. Cold. Overcast. Cold. 18 °F 1 mph Direction West 86% 29.92 "Hg N/A
Dec 20 5:00 AM Overcast. Cold. Overcast. Cold. 18 °F 3 mph Direction West 86% 29.92 "Hg 6 mi
Dec 20 5:30 AM Overcast. Cold. Overcast. Cold. 18 °F 2 mph Direction Northwest 86% 29.92 "Hg 6 mi
Dec 20 6:00 AM Passing clouds. Cold. Passing clouds. Cold. 18 °F 2 mph Direction South 86% 29.89 "Hg N/A
Dec 20 7:00 AM Passing clouds. Cold. Passing clouds. Cold. 16 °F 3 mph Direction West 86% 29.89 "Hg N/A
Dec 20 8:00 AM Passing clouds. Cold. Passing clouds. Cold. 14 °F 2 mph Direction West 85% 29.89 "Hg N/A
Dec 20 9:00 AM Scattered clouds. Cold. Scattered clouds. Cold. 16 °F No wind - 93% 29.92 "Hg 5 mi
Dec 20 10:00 AM Scattered clouds. Cold. Scattered clouds. Cold. 19 °F 3 mph Direction Northwest 79% 29.89 "Hg N/A
Dec 20 11:00 AM Sunny. Cold. Sunny. Cold. 23 °F 6 mph Direction North-northwest 74% 29.89 "Hg 10 mi
Dec 20 12:00 Noon Light snow. Clear. Chilly. Light snow. Clear. Chilly. 27 °F 6 mph Direction North 69% 29.89 "Hg N/A
Dec 20 1:00 PM Partly sunny. Chilly. Partly sunny. Chilly. 28 °F 8 mph Direction North-northwest 64% 29.86 "Hg N/A
Dec 20 2:00 PM Light snow. Partly sunny. Chilly. Light snow. Partly sunny. Chilly. 28 °F 8 mph Direction North 64% 29.83 "Hg N/A
Dec 20 3:00 PM Partly sunny. Chilly. Partly sunny. Chilly. 28 °F 8 mph Direction North-northwest 80% 29.83 "Hg N/A
Dec 20 5:00 PM Passing clouds. Chilly. Passing clouds. Chilly. 30 °F 10 mph Direction North 69% 29.80 "Hg N/A
Dec 20 6:00 PM Clear. Chilly. Clear. Chilly. 30 °F 14 mph Direction North 69% 29.80 "Hg N/A
Dec 20 6:30 PM Clear. Chilly. Clear. Chilly. 30 °F 16 mph Direction North 69% 29.80 "Hg N/A
Dec 20 7:00 PM Clear. Chilly. Clear. Chilly. 30 °F 17 mph Direction North 69% 29.80 "Hg N/A
Dec 20 7:30 PM Clear. Chilly. Clear. Chilly. 30 °F 15 mph Direction North 69% 29.80 "Hg N/A
Dec 20 8:00 PM Clear. Chilly. Clear. Chilly. 30 °F 16 mph Direction North 64% 29.80 "Hg N/A
Dec 20 8:30 PM Clear. Chilly. Clear. Chilly. 32 °F 17 mph Direction North 64% 29.80 "Hg N/A
Dec 20 9:00 PM Clear. Chilly. Clear. Chilly. 32 °F 15 mph Direction North 64% 29.80 "Hg N/A
Dec 20 9:30 PM Clear. Chilly. Clear. Chilly. 32 °F 13 mph Direction North 64% 29.80 "Hg N/A
Dec 20 10:00 PM Passing clouds. Chilly. Passing clouds. Chilly. 34 °F 9 mph Direction North 60% 29.80 "Hg N/A
Dec 20 10:30 PM Passing clouds. Chilly. Passing clouds. Chilly. 34 °F 13 mph Direction North 60% 29.80 "Hg N/A
Dec 20 11:00 PM Clear. Chilly. Clear. Chilly. 34 °F 12 mph Direction North 65% 29.80 "Hg N/A
Dec 20 11:30 PM Clear. Chilly. Clear. Chilly. 34 °F 12 mph Direction North 65% 29.80 "Hg N/A
Expand/Collapse Weather on 21 Déc                  
Dec 21 12:00 Midnight Passing clouds. Chilly. Passing clouds. Chilly. 36 °F 10 mph Direction North 60% 29.80 "Hg N/A
Dec 21 12:30 AM Clear. Chilly. Clear. Chilly. 36 °F 12 mph Direction North 60% 29.80 "Hg N/A
Dec 21 1:00 AM Clear. Chilly. Clear. Chilly. 36 °F 17 mph Direction North 60% 29.80 "Hg N/A
Dec 21 1:30 AM Clear. Chilly. Clear. Chilly. 36 °F 10 mph Direction North 60% 29.80 "Hg N/A
Dec 21 2:00 AM Clear. Chilly. Clear. Chilly. 36 °F 15 mph Direction North 60% 29.80 "Hg N/A
Dec 21 2:30 AM Clear. Chilly. Clear. Chilly. 36 °F 12 mph Direction North 56% 29.80 "Hg N/A
Dec 21 3:00 AM Clear. Chilly. Clear. Chilly. 36 °F 12 mph Direction North 56% 29.77 "Hg N/A
Dec 21 3:30 AM Clear. Chilly. Clear. Chilly. 36 °F 15 mph Direction North 56% 29.77 "Hg N/A
Dec 21 4:00 AM Clear. Chilly. Clear. Chilly. 36 °F 9 mph Direction North 56% 29.74 "Hg N/A
Dec 21 4:30 AM Clear. Chilly. Clear. Chilly. 36 °F 14 mph Direction North 56% 29.74 "Hg N/A
Dec 21 5:00 AM Clear. Chilly. Clear. Chilly. 36 °F 12 mph Direction North 56% 29.74 "Hg N/A
Dec 21 5:30 AM Clear. Chilly. Clear. Chilly. 36 °F 13 mph Direction North 56% 29.71 "Hg N/A
Dec 21 6:00 AM Passing clouds. Chilly. Passing clouds. Chilly. 36 °F 12 mph Direction North 56% 29.71 "Hg N/A
Dec 21 7:00 AM Passing clouds. Chilly. Passing clouds. Chilly. 36 °F 14 mph Direction North 60% 29.68 "Hg N/A
Dec 21 8:00 AM Passing clouds. Chilly. Passing clouds. Chilly. 36 °F 17 mph Direction North 60% 29.62 "Hg N/A
Dec 21 9:00 AM Broken clouds. Chilly. Broken clouds. Chilly. 37 °F 10 mph Direction North 60% 29.59 "Hg N/A
Dec 21 10:05 AM Broken clouds. Nippy. Broken clouds. Nippy. 41 °F 15 mph Direction North 61% 29.59 "Hg N/A
Dec 21 11:00 AM More clouds than sun. Nippy. More clouds than sun. Nippy. 41 °F 12 mph Direction North 61% 29.56 "Hg N/A
Dec 21 12:00 Noon More clouds than sun. Nippy. More clouds than sun. Nippy. 43 °F 21 mph Direction North 61% 29.53 "Hg N/A
Dec 21 1:00 PM More clouds than sun. Nippy. More clouds than sun. Nippy. 43 °F 18 mph Direction North-northeast 71% 29.47 "Hg N/A
Dec 21 2:00 PM More clouds than sun. Nippy. More clouds than sun. Nippy. 45 °F 22 mph Direction North 66% 29.42 "Hg N/A
Dec 21 3:00 PM Mostly cloudy. Nippy. Mostly cloudy. Nippy. 45 °F 25 mph Direction North 71% 29.39 "Hg N/A
Dec 21 4:00 PM Cloudy. Nippy. Cloudy. Nippy. 45 °F 32 mph Direction North 71% 29.36 "Hg N/A
Dec 21 5:00 PM Overcast. Cool. Overcast. Cool. 46 °F 28 mph Direction North 71% 29.33 "Hg N/A
Dec 21 6:00 PM Clear. Cool. Clear. Cool. 46 °F 26 mph Direction North 71% 29.33 "Hg N/A
Dec 21 6:30 PM Passing clouds. Cool. Passing clouds. Cool. 46 °F 26 mph Direction North 71% 29.33 "Hg N/A
Dec 21 7:00 PM Clear. Cool. Clear. Cool. 46 °F 28 mph Direction North 76% 29.33 "Hg N/A
Dec 21 7:30 PM Clear. Cool. Clear. Cool. 48 °F 32 mph Direction North 71% 29.30 "Hg N/A
Dec 21 8:00 PM Clear. Cool. Clear. Cool. 46 °F 29 mph Direction North 76% 29.30 "Hg N/A
Dec 21 8:30 PM Clear. Cool. Clear. Cool. 48 °F 26 mph Direction North 71% 29.30 "Hg N/A
Dec 21 9:00 PM Clear. Cool. Clear. Cool. 48 °F 20 mph Direction North 71% 29.30 "Hg N/A
Dec 21 9:30 PM Clear. Cool. Clear. Cool. 48 °F 20 mph Direction North 71% 29.33 "Hg N/A
Dec 21 10:00 PM Passing clouds. Cool. Passing clouds. Cool. 48 °F 24 mph Direction North 76% 29.33 "Hg N/A
Dec 21 10:30 PM Passing clouds. Cool. Passing clouds. Cool. 48 °F 18 mph Direction North 76% 29.33 "Hg N/A
Dec 21 11:00 PM Passing clouds. Cool. Passing clouds. Cool. 48 °F 21 mph Direction North 82% 29.30 "Hg N/A
Dec 21 11:30 PM Passing clouds. Cool. Passing clouds. Cool. 48 °F 22 mph Direction North 82% 29.33 "Hg N/A
Expand/Collapse Weather on 22 Déc                  
Dec 22 12:00 Midnight Passing clouds. Cool. Passing clouds. Cool. 50 °F 28 mph Direction North 76% 29.30 "Hg N/A
Dec 22 12:30 AM Passing clouds. Cool. Passing clouds. Cool. 50 °F 24 mph Direction North 76% 29.33 "Hg N/A
Dec 22 1:00 AM Passing clouds. Cool. Passing clouds. Cool. 50 °F 23 mph Direction North 82% 29.33 "Hg N/A
Dec 22 1:30 AM Passing clouds. Cool. Passing clouds. Cool. 50 °F 23 mph Direction North 82% 29.33 "Hg N/A
Dec 22 2:00 AM Partly cloudy. Cool. Partly cloudy. Cool. 52 °F 24 mph Direction North 77% 29.30 "Hg N/A
Dec 22 2:30 AM Passing clouds. Cool. Passing clouds. Cool. 52 °F 21 mph Direction North 82% 29.33 "Hg N/A
Dec 22 3:00 AM Passing clouds. Cool. Passing clouds. Cool. 52 °F 23 mph Direction North 77% 29.33 "Hg N/A
Dec 22 3:30 AM Passing clouds. Cool. Passing clouds. Cool. 52 °F 22 mph Direction North 77% 29.33 "Hg N/A
Dec 22 4:00 AM Passing clouds. Cool. Passing clouds. Cool. 52 °F 23 mph Direction North 77% 29.33 "Hg N/A
Dec 22 4:30 AM Passing clouds. Cool. Passing clouds. Cool. 52 °F 22 mph Direction North 77% 29.33 "Hg N/A
Dec 22 5:00 AM Passing clouds. Cool. Passing clouds. Cool. 52 °F 20 mph Direction North 77% 29.33 "Hg N/A
Dec 22 5:30 AM Passing clouds. Cool. Passing clouds. Cool. 52 °F 20 mph Direction North-northeast 77% 29.33 "Hg N/A
Dec 22 6:00 AM Partly cloudy. Cool. Partly cloudy. Cool. 52 °F 22 mph Direction North 82% 29.33 "Hg N/A
Dec 22 7:00 AM Partly cloudy. Cool. Partly cloudy. Cool. 54 °F 20 mph Direction North 77% 29.36 "Hg N/A
Dec 22 8:00 AM Partly cloudy. Cool. Partly cloudy. Cool. 54 °F 21 mph Direction North 77% 29.36 "Hg N/A
Dec 22 9:00 AM Broken clouds. Cool. Broken clouds. Cool. 54 °F 21 mph Direction North 77% 29.36 "Hg N/A
Dec 22 10:00 AM Broken clouds. Cool. Broken clouds. Cool. 54 °F 26 mph Direction North 77% 29.39 "Hg N/A
Dec 22 11:00 AM Partly sunny. Cool. Partly sunny. Cool. 54 °F 22 mph Direction North 77% 29.39 "Hg N/A
Dec 22 12:00 Noon Partly sunny. Cool. Partly sunny. Cool. 55 °F 23 mph Direction North 72% 29.36 "Hg N/A
Dec 22 1:00 PM Broken clouds. Cool. Broken clouds. Cool. 55 °F 20 mph Direction North 72% 29.36 "Hg N/A
Dec 22 2:00 PM Broken clouds. Cool. Broken clouds. Cool. 55 °F 16 mph Direction North-northeast 72% 29.33 "Hg N/A
Dec 22 3:00 PM Broken clouds. Cool. Broken clouds. Cool. 55 °F 9 mph Direction North-northeast 67% 29.30 "Hg N/A

参考文献

【1】唐建民，“下雪不冷化雪冷”新说，http://159.226.26.14/m/user_content.aspx?id=36827

【2】唐建民，北极熊是否会觉得“下雪不冷化雪冷”，http://159.226.26.14/m/user_content.aspx?id=43056

【3】吕喆，为何“下雪不冷化雪冷”，http://www.sciencenet.cn/m/user_content.aspx?id=275090

【4】吕喆，为何“下雪不冷化雪冷”（续），http://www.sciencenet.cn/m/user_content.aspx?id=275445

【5】麻庭光，下雪不冷化雪冷？，http://www.sciencenet.cn/m/user_content.aspx?id=275421

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