Weather History for Helena, MT

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Wednesday, December 5, 2012

  Actual Average Record
Temperature  
Mean Temperature 42 °F 24 °F  
Max Temperature 55 °F 34 °F 60 °F (1939)
Min Temperature 29 °F 14 °F -28 °F (1972)
Degree Days  
Heating Degree Days 23 41  
Month to date heating degree days 115 202  
Since 1 July heating degree days 1793 2084  
Cooling Degree Days 0 0  
Month to date cooling degree days 0 0  
Year to date cooling degree days 531 406  
Moisture  
Dew Point 26 °F    
Average Humidity 45    
Maximum Humidity 56    
Minimum Humidity 34    
Precipitation  
Precipitation T in 0.02 in 0.35 in (1986)
Month to date precipitation 0.08 0.08  
Year to date precipitation 8.98 10.90  
Snow  
Snow 0.00 in 0.20 in 5.00 in (1909)
Month to date snowfall 0.0 1.1  
Since 1 July snowfall 17.0 9.9  
Snow Depth 0.00 in    
Sea Level Pressure  
Sea Level Pressure 29.90 in    
Wind  
Wind Speed 12 mph (WSW)    
Max Wind Speed 30 mph    
Max Gust Speed 44 mph    
Visibility 10 miles    
Events Rain    
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Astronomy

Dec. 05, 2012 Rise Set
Actual Time 7:56 AM MST 4:40 PM MST
Civil Twilight 7:22 AM MST 5:15 PM MST
Nautical Twilight 6:43 AM MST 5:53 PM MST
Astronomical Twilight 6:07 AM MST 6:30 PM MST
Moon 11:53 PM MST (12/5) 12:05 PM MST (12/5)
Length of Visible Light 9h 53m
Length of Day
8h 44m
Waning Gibbous, 59% of the Moon is Illuminated
Dec 5
Waning Gibbous
Dec 6
Last Quarter
Dec 13
New
Dec 19
First Quarter
Dec 28
Full

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 50.0 °F - 32.0 °F 50% 29.86 in 10.0 mi SSW 17.3 mph 25.3 mph N/A   Clear
1:53 AM 50.0 °F - 32.0 °F 50% 29.82 in - SSW 21.9 mph 36.8 mph N/A   Clear
2:53 AM 50.0 °F - 32.0 °F 50% 29.79 in 10.0 mi South 19.6 mph 36.8 mph N/A   Clear
3:53 AM 50.0 °F - 32.0 °F 50% 29.78 in 10.0 mi South 21.9 mph 32.2 mph N/A   Clear
4:53 AM 50.0 °F - 32.0 °F 50% 29.78 in 10.0 mi South 15.0 mph 26.5 mph N/A   Scattered Clouds
5:53 AM 51.1 °F - 32.0 °F 48% 29.77 in 10.0 mi NNW 3.5 mph - N/A   Overcast
7:53 AM 48.9 °F - 34.0 °F 56% 29.75 in 10.0 mi SSE 15.0 mph 20.7 mph N/A   Partly Cloudy
8:53 AM 50.0 °F - 34.0 °F 54% 29.74 in 10.0 mi South 13.8 mph 20.7 mph N/A   Clear
9:53 AM 55.0 °F - 32.0 °F 42% 29.75 in 10.0 mi NW 6.9 mph 18.4 mph N/A   Mostly Cloudy
10:53 AM 46.9 °F - 37.0 °F 68% 29.82 in 10.0 mi WNW 15.0 mph - 0.00 in Rain Light Rain
11:00 AM 46.4 °F 41.1 °F 37.4 °F 71% 29.79 in 10.0 mi NW 11.5 mph - N/A   Mostly Cloudy
11:53 AM 46.9 °F - 35.1 °F 63% 29.83 in 10.0 mi West 9.2 mph 23.0 mph 0.00 in   Mostly Cloudy
12:53 PM 50.0 °F - 28.9 °F 44% 29.83 in 10.0 mi WNW 11.5 mph - N/A   Scattered Clouds
1:53 PM 48.0 °F - 25.0 °F 41% 29.87 in 10.0 mi West 13.8 mph 23.0 mph N/A   Clear
2:53 PM 46.9 °F - 19.9 °F 34% 29.87 in 10.0 mi WSW 23.0 mph 32.2 mph N/A   Clear
3:53 PM 44.1 °F 37.1 °F 19.0 °F 37% 29.91 in 10.0 mi West 15.0 mph 40.3 mph N/A   Clear
4:53 PM 41.0 °F 33.9 °F 17.6 °F 39% 29.90 in 10.0 mi WNW 12.7 mph 18.4 mph N/A   Clear
5:53 PM 37.0 °F 28.9 °F 18.0 °F 46% 29.99 in - West 12.7 mph - N/A   Clear
6:53 PM 37.0 °F - 16.0 °F 42% 30.04 in 10.0 mi Calm Calm - N/A   Clear
7:53 PM 33.1 °F 27.7 °F 16.0 °F 50% 30.09 in 10.0 mi WNW 5.8 mph - N/A   Clear
8:53 PM 33.1 °F 30.0 °F 17.1 °F 52% 30.11 in 10.0 mi SW 3.5 mph - N/A   Clear
9:53 PM 33.1 °F 25.5 °F 17.1 °F 52% 30.10 in - SW 9.2 mph - N/A   Clear
10:53 PM 32.0 °F - 17.1 °F 54% 30.13 in - Calm Calm - N/A   Clear
11:53 PM 34.0 °F 28.8 °F 17.1 °F 50% 30.13 in - SSW 5.8 mph - N/A   Partly Cloudy