Weather History for Chicago, IL

Thursday, December 31, 2009 — View Current Weather Conditions
Thursday, December 31, 2009
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Daily Weekly Monthly Custom
  Actual Average Record
Temperature
Mean Temperature 21 °F 24 °F  
Max Temperature 32 °F 32 °F 68 °F (1875)
Min Temperature 9 °F 17 °F -10 °F (1967)
Degree Days
Heating Degree Days 44 40  
Month to date heating degree days 1188 1153  
Since 1 July heating degree days 2341 2411  
Cooling Degree Days 0 0  
Month to date cooling degree days 0 0  
Year to date cooling degree days 589 843  
Moisture
Dew Point -    
Average Humidity 77    
Maximum Humidity 92    
Minimum Humidity 61    
Precipitation
Precipitation 0.01 in 0.06 in 0.89 in (1978)
Month to date precipitation 2.73 2.25  
Year to date precipitation 42.57 36.89  
Snow
Snow T in 0.30 in 7.60 in (1978)
Month to date snowfall 20.8 8.2  
Since 1 July snowfall 20.8 9.6  
Snow Depth -    
Wind
Wind Speed 9 mph (North)    
Max Wind Speed 15 mph    
Max Gust Speed 20 mph    
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary
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Astronomy
Dec. 31, 2009 Rise Set
Actual Time 7:19 AM CST 4:30 PM CST
Civil Twilight 6:47 AM CST 5:01 PM CST
Nautical Twilight 6:12 AM CST 5:36 PM CST
Astronomical Twilight 5:38 AM CST 6:10 PM CST
Moon 4:31 PM CST (12/31) 7:16 AM CST (12/31)
Length Of Visible Light 10h 13m
Length of Day
9h 10m
Full, 100% of the Moon is Illuminated
Dec 31
Full
Dec 31
Full
Jan 7
Last Quarter
Jan 15
New
Jan 23
First Quarter
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Hourly Weather History & Observations
Time (CST) Temp. Windchill Dew Point Humidity Pressure Visibility Wind Dir Wind Speed Gust Speed Precip Events Conditions
12:19 AM 30.2 °F 25.4 °F 28.4 °F 93% 29.89 in 1.0 mi SW 4.6 mph - 0.01 in Snow Light Snow
12:32 AM 30.2 °F 24.3 °F 28.4 °F 93% 29.88 in 3.0 mi SW 5.8 mph - 0.01 in Snow Light Snow
12:41 AM 30.2 °F 24.3 °F 28.4 °F 93% 29.88 in 3.0 mi SW 5.8 mph - 0.01 in Snow Light Snow
12:51 AM 30.9 °F 25.2 °F 28.9 °F 92% 29.90 in 3.0 mi SW 5.8 mph - 0.01 in Snow Light Snow
1:13 AM 30.2 °F 24.3 °F 28.4 °F 93% 29.88 in 3.0 mi SW 5.8 mph - 0.00 in Snow Light Snow
1:51 AM 30.9 °F 24.3 °F 28.9 °F 92% 29.91 in 5.0 mi SW 6.9 mph - 0.00 in Snow Light Snow
2:51 AM 30.9 °F 25.2 °F 28.9 °F 92% 29.91 in 7.0 mi WSW 5.8 mph - 0.00 in   Overcast
3:51 AM 32.0 °F 27.5 °F 28.9 °F 88% 29.90 in 9.0 mi West 4.6 mph - N/A   Overcast
4:51 AM 32.0 °F 26.4 °F 28.9 °F 88% 29.91 in 8.0 mi WSW 5.8 mph - N/A   Overcast
5:51 AM 30.2 °F 23.4 °F 28.4 °F 93% 29.91 in 6.0 mi WSW 6.9 mph - N/A Snow Light Snow
6:51 AM 32.0 °F 26.4 °F 28.9 °F 88% 29.94 in 4.0 mi WSW 5.8 mph - 0.00 in Snow Light Snow
7:51 AM 32.0 °F 26.4 °F 28.9 °F 88% 29.95 in 3.0 mi West 5.8 mph - 0.00 in Snow Light Snow
8:18 AM 32.0 °F 23.0 °F 28.4 °F 87% 29.94 in 5.0 mi West 11.5 mph 17.3 mph 0.00 in   Overcast
8:51 AM 32.0 °F 25.6 °F 28.9 °F 88% 29.97 in 7.0 mi West 6.9 mph - 0.00 in   Overcast
9:20 AM 32.0 °F 24.8 °F 28.4 °F 87% 29.95 in 8.0 mi WNW 8.1 mph - N/A   Overcast
9:51 AM 32.0 °F 23.6 °F 27.0 °F 82% 29.98 in 8.0 mi WNW 10.4 mph - N/A   Overcast
10:19 AM 32.0 °F 23.6 °F 26.6 °F 80% 29.96 in 7.0 mi West 10.4 mph - N/A   Overcast
10:51 AM 30.9 °F 22.2 °F 26.1 °F 82% 29.99 in 6.0 mi WNW 10.4 mph - N/A   Haze
11:51 AM 28.9 °F 19.8 °F 23.0 °F 78% 29.99 in 7.0 mi WNW 10.4 mph - N/A   Overcast
12:51 PM 28.0 °F 20.0 °F 23.0 °F 81% 30.00 in 6.0 mi West 8.1 mph - N/A   Haze
1:51 PM 26.1 °F 14.0 °F 19.9 °F 78% 30.02 in 5.0 mi WNW 15.0 mph 19.6 mph N/A   Haze
2:51 PM 24.1 °F 12.5 °F 18.0 °F 77% 30.06 in 5.0 mi West 12.7 mph - N/A   Haze
3:51 PM 21.0 °F 8.1 °F 14.0 °F 74% 30.08 in 5.0 mi NW 13.8 mph - 0.00 in Snow Light Snow
4:24 PM 19.4 °F 5.0 °F 10.4 °F 68% 30.08 in 8.0 mi NW 16.1 mph - 0.00 in Snow Light Snow
4:51 PM 19.0 °F 6.8 °F 9.0 °F 65% 30.12 in 9.0 mi WNW 11.5 mph - 0.00 in Snow Light Snow
5:32 PM 17.6 °F 1.7 °F 6.8 °F 63% 30.11 in 9.0 mi NW 18.4 mph - 0.00 in Snow Light Snow
5:51 PM 16.0 °F 1.1 °F 5.0 °F 62% 30.15 in 9.0 mi NW 15.0 mph - 0.00 in Snow Light Snow
6:51 PM 15.1 °F 3.3 °F 3.0 °F 59% 30.18 in 10.0 mi NW 9.2 mph - 0.00 in   Partly Cloudy
7:51 PM 14.0 °F 2.0 °F 3.0 °F 62% 30.19 in 10.0 mi WNW 9.2 mph - N/A   Scattered Clouds
8:51 PM 12.0 °F 0.5 °F 3.0 °F 67% 30.19 in 10.0 mi West 8.1 mph - N/A   Partly Cloudy
9:51 PM 10.9 °F -1.8 °F 1.9 °F 67% 30.20 in 10.0 mi WNW 9.2 mph - N/A   Clear
10:51 PM 10.0 °F -5.2 °F 1.9 °F 70% 30.22 in 10.0 mi WNW 12.7 mph - N/A   Clear
11:51 PM 9.0 °F -6.6 °F 1.9 °F 73% 30.23 in 10.0 mi WNW 12.7 mph - N/A   Clear
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