Weather History for Alton, IL

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Sunday, February 17, 2013

  Actual Average Record
Temperature  
Mean Temperature 34 °F -  
Max Temperature 46 °F 43 °F 68 °F (2011)
Min Temperature 22 °F 29 °F 14 °F (2001)
Degree Days  
Heating Degree Days 31    
Moisture  
Dew Point 20 °F    
Average Humidity 64    
Maximum Humidity 85    
Minimum Humidity 29    
Precipitation  
Precipitation 0.00 in - - ()
Sea Level Pressure  
Sea Level Pressure 30.10 in    
Wind  
Wind Speed 5 mph (ESE)    
Max Wind Speed 18 mph    
Max Gust Speed 26 mph    
Visibility 10 miles    
Events Thunderstorm    
Averages and records for this station are not official NWS values.
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Date:

Astronomy

Feb. 17, 2013 Rise Set
Actual Time 6:48 AM CST 5:40 PM CST
Civil Twilight 6:21 AM CST 6:07 PM CST
Nautical Twilight 5:50 AM CST 6:38 PM CST
Astronomical Twilight 5:19 AM CST 7:09 PM CST
Moon 10:46 AM CST (2/17) 12:31 AM CST (2/17)
Length of Visible Light 11h 46m
Length of Day
10h 51m
Waxing Crescent, 49% of the Moon is Illuminated
Feb 17
Waxing Crescent
Feb 17
First Quarter
Feb 25
Full
Mar 4
Last Quarter
Mar 11
New

Hourly Weather History & Observations

Time (CST) Temp. Windchill Dew Point Humidity Pressure Visibility Wind Dir Wind Speed Gust Speed Precip Events Conditions
12:15 AM 26.2 °F - 18.1 °F 71% 30.17 in 10.0 mi Calm Calm - N/A Thunderstorm Thunderstorm
12:35 AM 27.5 °F - 17.4 °F 66% 30.17 in 10.0 mi Calm Calm - N/A   Clear
12:55 AM 24.6 °F - 18.3 °F 77% 30.18 in 10.0 mi Calm Calm - N/A Thunderstorm Thunderstorm
1:15 AM 23.9 °F - 18.5 °F 80% 30.18 in 10.0 mi Calm Calm - N/A Thunderstorm Thunderstorm
1:35 AM 23.9 °F - 19.4 °F 83% 30.18 in 10.0 mi Calm Calm - N/A Thunderstorm Thunderstorm
1:55 AM 23.5 °F - 18.3 °F 80% 30.18 in 10.0 mi Calm Calm - N/A Thunderstorm Thunderstorm
2:15 AM 23.2 °F - 18.5 °F 82% 30.17 in 10.0 mi Calm Calm - N/A   Clear
2:35 AM 24.4 °F 20.1 °F 19.4 °F 81% 30.17 in 10.0 mi NE 3.5 mph - N/A   Clear
2:55 AM 23.9 °F - 18.5 °F 80% 30.17 in 10.0 mi Calm Calm - N/A Thunderstorm Thunderstorm
3:15 AM 23.7 °F - 19.2 °F 83% 30.17 in 10.0 mi Calm Calm - N/A Thunderstorm Thunderstorm
3:35 AM 22.1 °F - 16.9 °F 80% 30.17 in 10.0 mi Calm Calm - N/A   Clear
3:55 AM 23.7 °F 19.3 °F 19.0 °F 82% 30.17 in 10.0 mi ENE 3.5 mph - N/A Thunderstorm Thunderstorm
4:15 AM 23.2 °F - 18.3 °F 82% 30.17 in 10.0 mi Calm Calm - N/A Thunderstorm Thunderstorm
4:35 AM 22.1 °F - 18.1 °F 85% 30.17 in 10.0 mi Calm Calm - N/A Thunderstorm Thunderstorm
4:55 AM 23.5 °F - 19.6 °F 85% 30.18 in 10.0 mi Calm Calm - N/A Thunderstorm Thunderstorm
5:15 AM 22.8 °F 16.7 °F 18.7 °F 84% 30.18 in 10.0 mi ENE 4.6 mph - N/A Thunderstorm Thunderstorm
5:35 AM 24.8 °F 17.9 °F 20.1 °F 82% 30.19 in 10.0 mi East 5.8 mph - N/A   Clear
5:55 AM 24.8 °F 19.1 °F 19.4 °F 80% 30.19 in 10.0 mi East 4.6 mph - N/A Thunderstorm Thunderstorm
6:45 AM 24.8 °F 16.9 °F 19.4 °F 80% 30.19 in 10.0 mi East 6.9 mph - N/A   Scattered Clouds
7:45 AM 37.4 °F 28.9 °F 21.2 °F 52% 30.20 in 10.0 mi East 13.8 mph - N/A   Mostly Cloudy
8:50 AM 30.2 °F 20.8 °F 23.0 °F 75% 30.21 in 10.0 mi ESE 11.5 mph - N/A   Overcast
9:45 AM 33.8 °F 25.3 °F 23.0 °F 65% 30.20 in 10.0 mi ESE 11.5 mph - N/A   Overcast
10:45 AM 37.4 °F 28.9 °F 17.6 °F 45% 30.18 in 10.0 mi ESE 13.8 mph - N/A   Scattered Clouds
11:50 AM 41.0 °F 33.5 °F 14.0 °F 33% 30.16 in 10.0 mi ESE 13.8 mph - N/A   Scattered Clouds
1:50 PM 44.6 °F 37.4 °F 14.0 °F 29% 30.09 in 10.0 mi SE 16.1 mph 26.5 mph N/A   Mostly Cloudy
2:50 PM 46.4 °F 39.8 °F 15.8 °F 29% 30.06 in 10.0 mi SE 16.1 mph 23.0 mph N/A   Mostly Cloudy
4:50 PM 46.4 °F 41.1 °F 17.6 °F 32% 30.02 in 10.0 mi SE 11.5 mph 20.7 mph N/A   Mostly Cloudy
5:50 PM 42.8 °F 35.8 °F 21.2 °F 42% 30.00 in 10.0 mi ESE 13.8 mph - N/A   Scattered Clouds
7:50 PM 41.0 °F 32.8 °F 24.8 °F 53% 30.01 in 10.0 mi SE 16.1 mph - N/A   Mostly Cloudy
8:50 PM 41.0 °F 32.2 °F 24.8 °F 53% 29.99 in 10.0 mi SE 18.4 mph - N/A   Mostly Cloudy
9:15 PM 40.3 °F 33.0 °F 24.8 °F 54% 29.99 in 10.0 mi SE 12.7 mph - N/A   Clear
9:35 PM 40.3 °F 33.0 °F 24.6 °F 54% 29.98 in 10.0 mi SE 12.7 mph - N/A   Clear
9:50 PM 41.0 °F 32.5 °F 24.8 °F 53% 29.97 in 10.0 mi SE 17.3 mph - N/A   Mostly Cloudy
9:55 PM 40.1 °F 32.4 °F 24.4 °F 54% 29.97 in 10.0 mi ESE 13.8 mph - N/A   Clear
10:15 PM 40.3 °F 32.6 °F 24.3 °F 53% 29.97 in 10.0 mi SE 13.8 mph 21.9 mph N/A   Clear
10:35 PM 39.9 °F 31.4 °F 24.4 °F 54% 29.96 in 10.0 mi SE 16.1 mph - N/A   Clear
10:55 PM 40.6 °F 32.7 °F 24.4 °F 53% 29.95 in 10.0 mi SE 15.0 mph 19.6 mph N/A   Clear
11:15 PM 40.3 °F 32.6 °F 24.4 °F 53% 29.94 in 10.0 mi SE 13.8 mph - N/A   Clear
11:35 PM 39.6 °F 32.5 °F 24.6 °F 55% 29.94 in 10.0 mi SE 11.5 mph - N/A   Clear
11:55 PM 39.0 °F 32.3 °F 24.8 °F 57% 29.94 in 10.0 mi SE 10.4 mph - N/A   Clear