Weather History for Helena, MT

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Tuesday, February 15, 2011

  Actual Average Record
Temperature  
Mean Temperature 50 °F 28 °F  
Max Temperature 58 °F 39 °F 58 °F (1982)
Min Temperature 42 °F 17 °F -33 °F (1936)
Degree Days  
Heating Degree Days 15 37  
Month to date heating degree days 570 580  
Since 1 July heating degree days 5140 5098  
Cooling Degree Days 0 0  
Month to date cooling degree days 0 0  
Year to date cooling degree days 0 0  
Moisture  
Dew Point 20 °F    
Average Humidity 33    
Maximum Humidity 45    
Minimum Humidity 21    
Precipitation  
Precipitation 0.00 in 0.01 in 0.30 in (1986)
Month to date precipitation 0.42 0.15  
Year to date precipitation 0.64 0.51  
Snow  
Snow 0.00 in 0.20 in 5.30 in (1942)
Month to date snowfall 7.3 2.8  
Since 1 July snowfall 27.1 25.1  
Snow Depth 0.00 in    
Sea Level Pressure  
Sea Level Pressure 29.62 in    
Wind  
Wind Speed 14 mph (SSW)    
Max Wind Speed 31 mph    
Max Gust Speed 45 mph    
Visibility 10 miles    
Events      
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Astronomy

Feb. 15, 2011 Rise Set
Actual Time 7:31 AM MST 5:52 PM MST
Civil Twilight 7:00 AM MST 6:24 PM MST
Nautical Twilight 6:25 AM MST 6:59 PM MST
Astronomical Twilight 5:50 AM MST 7:34 PM MST
Moon 2:58 PM MST (2/15) 5:37 AM MST (2/15)
Length of Visible Light 11h 23m
Length of Day
10h 20m
Waxing Gibbous, 91% of the Moon is Illuminated
Feb 15
Waxing Gibbous
Feb 18
Full
Feb 24
Last Quarter
Mar 4
New
Mar 12
First Quarter

Hourly Weather History & Observations

Time (MST) Temp. Windchill Dew Point Humidity Pressure Visibility Wind Dir Wind Speed Gust Speed Precip Events Conditions
12:53 AM 43.0 °F 37.2 °F 23.0 °F 45% 29.77 in 10.0 mi SSE 10.4 mph 17.3 mph N/A   Partly Cloudy
1:53 AM 45.0 °F 40.1 °F 21.9 °F 40% 29.75 in 10.0 mi SSE 9.2 mph - N/A   Partly Cloudy
2:53 AM 46.0 °F 40.6 °F 21.9 °F 39% 29.73 in 10.0 mi South 11.5 mph - N/A   Partly Cloudy
3:53 AM 46.9 °F - 21.9 °F 37% 29.70 in 10.0 mi SSW 11.5 mph - N/A   Clear
4:53 AM 42.8 °F 36.6 °F 23.0 °F 46% 29.67 in 10.0 mi South 11.5 mph - N/A   Clear
5:53 AM 46.0 °F 40.6 °F 21.9 °F 39% 29.70 in 10.0 mi SSW 11.5 mph - N/A   Clear
6:53 AM 46.9 °F - 21.0 °F 36% 29.68 in 10.0 mi SSW 16.1 mph 25.3 mph N/A   Clear
7:53 AM 46.9 °F - 19.9 °F 34% 29.68 in 10.0 mi South 13.8 mph 24.2 mph N/A   Clear
8:53 AM 48.0 °F - 19.9 °F 33% 29.68 in 10.0 mi South 12.7 mph - N/A   Clear
9:53 AM 51.1 °F - 21.0 °F 31% 29.68 in 10.0 mi South 16.1 mph 21.9 mph N/A   Clear
10:53 AM 53.1 °F - 21.0 °F 29% 29.65 in 10.0 mi South 11.5 mph 20.7 mph N/A   Partly Cloudy
11:53 AM 55.0 °F - 21.0 °F 27% 29.62 in 10.0 mi SSW 18.4 mph 25.3 mph N/A   Mostly Cloudy
12:53 PM 57.0 °F - 19.0 °F 23% 29.60 in 10.0 mi SW 21.9 mph 33.4 mph N/A   Partly Cloudy
1:53 PM 57.0 °F - 18.0 °F 22% 29.59 in 10.0 mi SW 20.7 mph 40.3 mph N/A   Clear
2:53 PM 57.9 °F - 17.1 °F 20% 29.56 in 10.0 mi WSW 27.6 mph 40.3 mph N/A   Clear
3:53 PM 55.9 °F - 17.1 °F 22% 29.56 in 10.0 mi SSW 10.4 mph 19.6 mph N/A   Partly Cloudy
4:53 PM 55.9 °F - 17.1 °F 22% 29.57 in 10.0 mi SW 13.8 mph - N/A   Partly Cloudy
5:53 PM 53.1 °F - 19.0 °F 26% 29.57 in 10.0 mi SSW 9.2 mph - N/A   Mostly Cloudy
6:53 PM 51.1 °F - 21.0 °F 31% 29.56 in 10.0 mi South 19.6 mph 26.5 mph N/A   Scattered Clouds
7:53 PM 48.9 °F - 21.0 °F 33% 29.55 in 10.0 mi South 15.0 mph - N/A   Partly Cloudy
8:53 PM 46.9 °F - 19.9 °F 34% 29.54 in 10.0 mi South 10.4 mph 20.7 mph N/A   Clear
9:53 PM 48.9 °F - 18.0 °F 29% 29.52 in 10.0 mi SSW 13.8 mph 26.5 mph N/A   Clear
10:53 PM 48.9 °F - 18.0 °F 29% 29.51 in 10.0 mi SSW 10.4 mph 19.6 mph N/A   Clear
11:53 PM 43.0 °F 36.8 °F 21.9 °F 43% 29.50 in 10.0 mi SE 11.5 mph - N/A   Clear