Weather History for Chicago, IL

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Saturday, July 21, 2012

  Actual Average Record
Temperature  
Mean Temperature 76 °F 74 °F  
Max Temperature 87 °F 84 °F 103 °F (1901)
Min Temperature 65 °F 64 °F 51 °F (1970)
Degree Days  
Heating Degree Days 0 0  
Month to date heating degree days 0 0  
Since 1 June heating degree days 14 48  
Since 1 July heating degree days 0 0  
Cooling Degree Days 11 9  
Month to date cooling degree days 364 188  
Year to date cooling degree days 826 407  
Since 1 June cooling degree days 655 353  
Growing Degree Days 26 (Base 50)    
Moisture  
Dew Point 63 °F    
Average Humidity 62    
Maximum Humidity 81    
Minimum Humidity 42    
Precipitation  
Precipitation 0.00 in 0.13 in 1.78 in (1999)
Month to date precipitation 2.21 2.36  
Year to date precipitation 15.32 18.89  
Snow  
Snow 0.00 in 0.00 in 0.00 in ()
Month to date snowfall 0.0 0.0  
Since 1 June snowfall 0.0 0.0  
Since 1 July snowfall 0.0 0.0  
Snow Depth 0.00 in    
Sea Level Pressure  
Sea Level Pressure 30.06 in    
Wind  
Wind Speed 5 mph (WSW)    
Max Wind Speed 12 mph    
Max Gust Speed 14 mph    
Visibility 10 miles    
Events      
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Date:

Astronomy

Jul. 21, 2012 Rise Set
Actual Time 5:35 AM CDT 8:20 PM CDT
Civil Twilight 5:02 AM CDT 8:53 PM CDT
Nautical Twilight 4:21 AM CDT 9:34 PM CDT
Astronomical Twilight 3:34 AM CDT 10:21 PM CDT
Moon 8:19 AM CDT (7/21) 9:28 PM CDT (7/21)
Length of Visible Light 15h 50m
Length of Day
14h 45m
Waxing Crescent, 7% of the Moon is Illuminated
Jul 21
Waxing Crescent
Jul 26
First Quarter
Aug 1
Full
Aug 9
Last Quarter
Aug 17
New

Hourly Weather History & Observations

Time (CDT) Temp. Heat Index Dew Point Humidity Pressure Visibility Wind Dir Wind Speed Gust Speed Precip Events Conditions
12:51 AM 68.0 °F - 61.0 °F 78% 30.07 in 10.0 mi Calm Calm - N/A   Clear
1:51 AM 69.1 °F - 61.0 °F 75% 30.08 in 10.0 mi Calm Calm - N/A   Clear
2:51 AM 66.9 °F - 61.0 °F 81% 30.07 in 10.0 mi Calm Calm - N/A   Scattered Clouds
3:51 AM 66.9 °F - 61.0 °F 81% 30.07 in 10.0 mi Calm Calm - N/A   Scattered Clouds
4:51 AM 66.0 °F - 61.0 °F 84% 30.06 in 10.0 mi WSW 3.5 mph - N/A   Partly Cloudy
5:51 AM 66.0 °F - 60.1 °F 81% 30.07 in 10.0 mi WSW 3.5 mph - N/A   Scattered Clouds
6:51 AM 68.0 °F - 62.1 °F 81% 30.11 in 10.0 mi West 6.9 mph - N/A   Scattered Clouds
7:51 AM 73.0 °F - 64.0 °F 73% 30.09 in 10.0 mi South 4.6 mph - N/A   Partly Cloudy
8:51 AM 75.9 °F - 61.0 °F 60% 30.09 in 10.0 mi SSW 8.1 mph - N/A   Mostly Cloudy
9:51 AM 79.0 °F - 60.1 °F 52% 30.11 in 10.0 mi SW 6.9 mph - N/A   Mostly Cloudy
10:51 AM 82.0 °F 82.7 °F 61.0 °F 49% 30.11 in 10.0 mi West 8.1 mph - N/A   Mostly Cloudy
11:51 AM 84.0 °F 84.0 °F 60.1 °F 44% 30.09 in 10.0 mi West 6.9 mph - N/A   Mostly Cloudy
12:51 PM 86.0 °F 86.1 °F 61.0 °F 43% 30.08 in 10.0 mi WNW 6.9 mph - N/A   Mostly Cloudy
1:51 PM 87.1 °F 87.8 °F 63.0 °F 44% 30.06 in 10.0 mi West 5.8 mph - N/A   Overcast
2:51 PM 86.0 °F 86.3 °F 62.1 °F 44% 30.05 in 10.0 mi SW 9.2 mph - N/A   Overcast
3:51 PM 86.0 °F 86.8 °F 63.0 °F 46% 30.04 in 10.0 mi WSW 4.6 mph - N/A   Overcast
4:51 PM 84.9 °F 86.6 °F 64.9 °F 51% 30.03 in 10.0 mi SW 6.9 mph - N/A   Overcast
5:51 PM 84.9 °F 87.1 °F 66.0 °F 53% 30.02 in 10.0 mi SSW 9.2 mph - N/A   Overcast
6:51 PM 84.0 °F 86.3 °F 66.0 °F 55% 30.01 in 10.0 mi West 5.8 mph - N/A   Mostly Cloudy
7:51 PM 82.9 °F 84.6 °F 64.9 °F 54% 30.02 in 10.0 mi West 4.6 mph - N/A   Mostly Cloudy
8:51 PM 82.0 °F 84.5 °F 66.9 °F 60% 30.02 in 10.0 mi West 4.6 mph - N/A   Overcast
9:51 PM 81.0 °F 83.3 °F 66.9 °F 62% 30.03 in 10.0 mi West 3.5 mph - N/A   Overcast
10:51 PM 79.0 °F - 66.9 °F 66% 30.03 in 10.0 mi West 3.5 mph - N/A   Scattered Clouds
11:51 PM 75.9 °F - 66.9 °F 74% 30.03 in 10.0 mi SW 4.6 mph - N/A   Scattered Clouds