Weather History for Helena, MT

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Tuesday, December 4, 2012

  Actual Average Record
Temperature  
Mean Temperature 42 °F 24 °F  
Max Temperature 51 °F 34 °F 64 °F (1918)
Min Temperature 32 °F 15 °F -24 °F (1972)
Degree Days  
Heating Degree Days 23 41  
Month to date heating degree days 92 161  
Since 1 July heating degree days 1770 2043  
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 50    
Maximum Humidity 61    
Minimum Humidity 39    
Precipitation  
Precipitation 0.00 in 0.01 in 0.32 in (1977)
Month to date precipitation 0.08 0.06  
Year to date precipitation 8.98 10.88  
Snow  
Snow 0.00 in 0.20 in 5.80 in (1977)
Month to date snowfall 0.0 0.9  
Since 1 July snowfall 17.0 9.7  
Snow Depth 0.00 in    
Sea Level Pressure  
Sea Level Pressure 30.01 in    
Wind  
Wind Speed 9 mph (South)    
Max Wind Speed 25 mph    
Max Gust Speed 33 mph    
Visibility 10 miles    
Events      
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Astronomy

Dec. 04, 2012 Rise Set
Actual Time 7:55 AM MST 4:41 PM MST
Civil Twilight 7:21 AM MST 5:15 PM MST
Nautical Twilight 6:43 AM MST 5:53 PM MST
Astronomical Twilight 6:06 AM MST 6:30 PM MST
Moon 10:46 PM MST (12/4) 11:38 AM MST (12/4)
Length of Visible Light 9h 54m
Length of Day
8h 45m
Waning Gibbous, 69% of the Moon is Illuminated
Dec 4
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 39.9 °F 32.1 °F 19.9 °F 45% 30.17 in 10.0 mi SSW 13.8 mph - N/A   Clear
1:53 AM 41.0 °F 33.9 °F 19.0 °F 41% 30.14 in 10.0 mi SW 12.7 mph 23.0 mph N/A   Clear
2:53 AM 35.1 °F 32.2 °F 21.0 °F 57% 30.15 in 10.0 mi East 3.5 mph - N/A   Clear
3:53 AM 36.0 °F 30.3 °F 19.9 °F 52% 30.11 in 10.0 mi ESE 6.9 mph - N/A   Clear
4:53 AM 33.1 °F - 21.9 °F 64% 30.10 in 10.0 mi Calm Calm - N/A   Mostly Cloudy
5:53 AM 36.0 °F 31.1 °F 21.0 °F 55% 30.08 in 10.0 mi ESE 5.8 mph - N/A   Overcast
6:53 AM 39.9 °F 31.1 °F 21.0 °F 47% 30.09 in 10.0 mi SSW 17.3 mph 28.8 mph N/A   Overcast
7:53 AM 39.0 °F 34.0 °F 25.0 °F 57% 30.05 in 10.0 mi South 6.9 mph - N/A   Overcast
8:53 AM 39.0 °F 32.3 °F 25.0 °F 57% 30.03 in 10.0 mi ESE 10.4 mph 23.0 mph N/A   Overcast
9:53 AM 44.1 °F - 24.1 °F 45% 30.01 in 10.0 mi Calm Calm - N/A   Overcast
10:53 AM 42.1 °F 37.1 °F 26.1 °F 53% 30.01 in - West 8.1 mph - N/A   Unknown
11:53 AM 46.9 °F - 27.0 °F 46% 29.98 in 10.0 mi Variable 3.5 mph - N/A   Mostly Cloudy
12:53 PM 50.0 °F - 27.0 °F 41% 29.95 in 10.0 mi South 18.4 mph 26.5 mph N/A   Mostly Cloudy
1:53 PM 50.0 °F - 27.0 °F 41% 29.95 in 10.0 mi South 19.6 mph 29.9 mph N/A   Overcast
2:53 PM 50.0 °F - 28.0 °F 43% 29.96 in 10.0 mi South 12.7 mph 27.6 mph N/A   Overcast
3:53 PM 51.1 °F - 28.0 °F 41% 29.97 in 10.0 mi SSE 5.8 mph - N/A   Mostly Cloudy
4:53 PM 50.0 °F - 28.9 °F 44% 29.98 in 10.0 mi South 12.7 mph 23.0 mph N/A   Overcast
5:53 PM 50.0 °F - 28.9 °F 44% 29.96 in 10.0 mi SE 10.4 mph - N/A   Mostly Cloudy
6:53 PM 48.9 °F - 30.9 °F 50% 29.94 in 10.0 mi Variable 3.5 mph - N/A   Clear
7:53 PM 48.9 °F - 32.0 °F 52% 29.96 in 10.0 mi ESE 5.8 mph - N/A   Clear
8:53 PM 48.9 °F - 32.0 °F 52% 29.95 in 10.0 mi Calm Calm - N/A   Overcast
9:53 PM 48.9 °F - 33.1 °F 54% 29.94 in 10.0 mi SSW 8.1 mph - N/A   Overcast
10:53 PM 50.0 °F - 33.1 °F 52% 29.92 in 10.0 mi SSW 11.5 mph 23.0 mph N/A   Overcast
11:53 PM 50.0 °F - 32.0 °F 50% 29.89 in 10.0 mi South 12.7 mph 21.9 mph N/A   Scattered Clouds