Weather History for Chicago, IL

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Friday, February 17, 2012

  Actual Average Record
Temperature  
Mean Temperature 39 °F 28 °F  
Max Temperature 49 °F 36 °F 60 °F (1880)
Min Temperature 28 °F 21 °F -11 °F (1903)
Degree Days  
Heating Degree Days 26 37  
Month to date heating degree days 552 662  
Since 1 July heating degree days 3602 4352  
Cooling Degree Days 0 0  
Month to date cooling degree days 0 0  
Year to date cooling degree days 0 0  
Moisture  
Dew Point 26 °F    
Average Humidity 60    
Maximum Humidity 78    
Minimum Humidity 42    
Precipitation  
Precipitation 0.00 in 0.06 in 1.10 in (2008)
Month to date precipitation 0.41 0.97  
Year to date precipitation 2.27 2.70  
Snow  
Snow 0.00 in 0.40 in 8.50 in (1893)
Month to date snowfall 1.8 5.9  
Since 1 July snowfall 15.7 26.4  
Snow Depth 0.00 in    
Sea Level Pressure  
Sea Level Pressure 30.08 in    
Wind  
Wind Speed 9 mph (WSW)    
Max Wind Speed 22 mph    
Max Gust Speed 29 mph    
Visibility 10 miles    
Events      
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Date:

Astronomy

Feb. 17, 2012 Rise Set
Actual Time 6:45 AM CST 5:26 PM CST
Civil Twilight 6:16 AM CST 5:55 PM CST
Nautical Twilight 5:44 AM CST 6:27 PM CST
Astronomical Twilight 5:12 AM CST 7:00 PM CST
Moon 3:39 AM CST (2/17) 1:16 PM CST (2/17)
Length of Visible Light 11h 38m
Length of Day
10h 41m
Waning Crescent, 19% of the Moon is Illuminated
Feb 17
Waning Crescent
Feb 21
New
Feb 29
First Quarter
Mar 8
Full
Mar 14
Last Quarter

Hourly Weather History & Observations

Time (CST) Temp. Windchill Dew Point Humidity Pressure Visibility Wind Dir Wind Speed Gust Speed Precip Events Conditions
12:51 AM 32.0 °F 26.4 °F 24.1 °F 73% 30.14 in 10.0 mi West 5.8 mph - N/A   Clear
1:51 AM 30.9 °F 27.5 °F 23.0 °F 72% 30.15 in 10.0 mi West 3.5 mph - N/A   Clear
2:51 AM 30.0 °F 26.5 °F 23.0 °F 75% 30.15 in 10.0 mi WSW 3.5 mph - N/A   Clear
3:51 AM 28.9 °F 22.8 °F 21.9 °F 75% 30.16 in 10.0 mi WSW 5.8 mph - N/A   Clear
4:51 AM 28.9 °F 25.2 °F 23.0 °F 78% 30.16 in 10.0 mi WSW 3.5 mph - N/A   Clear
5:51 AM 28.0 °F 22.8 °F 23.0 °F 81% 30.16 in 10.0 mi WSW 4.6 mph - N/A   Clear
6:51 AM 28.0 °F 24.2 °F 23.0 °F 81% 30.16 in 10.0 mi SW 3.5 mph - N/A   Partly Cloudy
7:51 AM 30.9 °F 24.3 °F 25.0 °F 79% 30.17 in 10.0 mi West 6.9 mph - N/A   Partly Cloudy
8:51 AM 33.8 °F 28.6 °F 26.6 °F 75% 30.14 in 10.0 mi South 5.8 mph - N/A   Scattered Clouds
9:51 AM 39.2 °F 35.0 °F 26.6 °F 61% 30.13 in 10.0 mi SSW 5.8 mph - N/A   Mostly Cloudy
10:51 AM 39.9 °F 32.5 °F 25.0 °F 55% 30.14 in 10.0 mi South 12.7 mph - N/A   Mostly Cloudy
11:51 AM 43.0 °F 37.7 °F 24.1 °F 47% 30.12 in 10.0 mi SSW 9.2 mph - N/A   Overcast
12:51 PM 46.4 °F 40.4 °F 24.8 °F 43% 30.06 in 10.0 mi SSW 13.8 mph 19.6 mph N/A   Mostly Cloudy
1:51 PM 46.9 °F - 27.0 °F 46% 30.04 in 10.0 mi SSW 18.4 mph 24.2 mph N/A   Mostly Cloudy
2:51 PM 48.9 °F - 30.0 °F 48% 30.02 in 10.0 mi SW 15.0 mph 23.0 mph N/A   Mostly Cloudy
3:51 PM 48.0 °F - 28.9 °F 48% 30.01 in 10.0 mi SW 12.7 mph - N/A   Overcast
4:51 PM 48.0 °F - 30.9 °F 52% 30.00 in 10.0 mi SSW 10.4 mph - N/A   Overcast
5:51 PM 46.9 °F - 32.0 °F 56% 29.99 in 10.0 mi SSW 8.1 mph - N/A   Mostly Cloudy
6:51 PM 46.0 °F 41.4 °F 30.9 °F 56% 30.00 in 10.0 mi WSW 9.2 mph - N/A   Scattered Clouds
7:51 PM 44.1 °F 38.6 °F 32.0 °F 63% 30.01 in 10.0 mi West 10.4 mph - N/A   Partly Cloudy
8:51 PM 41.0 °F 35.2 °F 28.4 °F 61% 30.00 in 10.0 mi West 9.2 mph - N/A   Partly Cloudy
9:51 PM 39.0 °F 32.3 °F 28.0 °F 65% 30.03 in 10.0 mi WNW 10.4 mph - N/A   Partly Cloudy
10:51 PM 37.0 °F 30.4 °F 27.0 °F 67% 30.04 in 10.0 mi WNW 9.2 mph - N/A   Partly Cloudy
11:51 PM 36.0 °F 29.6 °F 27.0 °F 70% 30.03 in 10.0 mi WNW 8.1 mph - N/A   Partly Cloudy