Weather History for Helena, MT

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Tuesday, December 11, 2012

  Actual Average Record
Temperature  
Mean Temperature 37 °F 22 °F  
Max Temperature 44 °F 32 °F 59 °F (2004)
Min Temperature 30 °F 12 °F -22 °F (1961)
Degree Days  
Heating Degree Days 28 43  
Month to date heating degree days 346 456  
Since 1 July heating degree days 2024 2338  
Cooling Degree Days 0 0  
Month to date cooling degree days 0 0  
Year to date cooling degree days 531 406  
Moisture  
Dew Point 24 °F    
Average Humidity 58    
Maximum Humidity 78    
Minimum Humidity 37    
Precipitation  
Precipitation 0.00 in 0.02 in 0.78 in (1917)
Month to date precipitation 0.46 0.16  
Year to date precipitation 9.36 10.98  
Snow  
Snow 0.00 in 0.20 in 11.00 in (1917)
Month to date snowfall 3.5 2.6  
Since 1 July snowfall 20.5 11.4  
Snow Depth 2.00 in    
Sea Level Pressure  
Sea Level Pressure 29.76 in    
Wind  
Wind Speed 6 mph (SW)    
Max Wind Speed 21 mph    
Max Gust Speed 26 mph    
Visibility 10 miles    
Events      
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Date:

Astronomy

Dec. 11, 2012 Rise Set
Actual Time 8:02 AM MST 4:40 PM MST
Civil Twilight 7:27 AM MST 5:15 PM MST
Nautical Twilight 6:49 AM MST 5:53 PM MST
Astronomical Twilight 6:12 AM MST 6:30 PM MST
Moon 5:58 AM MST (12/11) 3:25 PM MST (12/11)
Length of Visible Light 9h 47m
Length of Day
8h 37m
Waning Crescent, 4% of the Moon is Illuminated
Dec 11
Waning Crescent
Dec 13
New
Dec 19
First Quarter
Dec 28
Full
Jan 4
Last 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 34.0 °F - 21.9 °F 61% 30.01 in 10.0 mi Calm Calm - N/A   Overcast
1:53 AM 35.1 °F 26.4 °F 23.0 °F 61% 29.98 in 10.0 mi West 12.7 mph 21.9 mph N/A   Overcast
2:53 AM 35.1 °F 25.9 °F 23.0 °F 61% 29.97 in 10.0 mi West 13.8 mph - N/A   Mostly Cloudy
3:53 AM 35.1 °F 28.6 °F 23.0 °F 61% 29.94 in 10.0 mi West 8.1 mph - N/A   Clear
4:53 AM 33.1 °F 27.7 °F 23.0 °F 66% 29.92 in 10.0 mi SSE 5.8 mph - N/A   Scattered Clouds
5:53 AM 32.0 °F 28.7 °F 24.1 °F 73% 29.88 in 10.0 mi East 3.5 mph - N/A   Overcast
6:53 AM 30.9 °F 26.2 °F 24.1 °F 76% 29.86 in 10.0 mi ESE 4.6 mph - N/A   Overcast
7:53 AM 30.9 °F 27.5 °F 24.1 °F 76% 29.83 in 10.0 mi ESE 3.5 mph - N/A   Mostly Cloudy
8:53 AM 30.9 °F - 24.1 °F 76% 29.81 in 10.0 mi Calm Calm - N/A   Partly Cloudy
9:53 AM 32.0 °F 27.5 °F 24.1 °F 73% 29.80 in 10.0 mi West 4.6 mph - N/A   Clear
10:53 AM 30.9 °F - 24.1 °F 76% 29.80 in 10.0 mi Calm Calm - N/A   Partly Cloudy
11:53 AM 37.0 °F 29.8 °F 24.1 °F 59% 29.73 in 10.0 mi SSW 10.4 mph 18.4 mph N/A   Scattered Clouds
12:53 PM 41.0 °F 36.4 °F 25.0 °F 53% 29.65 in 10.0 mi Variable 6.9 mph - N/A   Mostly Cloudy
1:53 PM 36.0 °F - 26.1 °F 67% 29.65 in 10.0 mi Calm Calm - N/A   Scattered Clouds
2:53 PM 44.1 °F 38.6 °F 19.9 °F 38% 29.60 in 10.0 mi West 10.4 mph - N/A   Partly Cloudy
3:53 PM 43.0 °F 36.0 °F 19.9 °F 40% 29.62 in 10.0 mi West 13.8 mph - N/A   Scattered Clouds
4:53 PM 39.9 °F 36.7 °F 21.0 °F 47% 29.63 in 10.0 mi WNW 4.6 mph - N/A   Overcast
5:53 PM 39.0 °F 31.4 °F 24.1 °F 55% 29.64 in 10.0 mi West 12.7 mph - N/A   Overcast
6:53 PM 37.9 °F 35.5 °F 24.1 °F 57% 29.63 in 10.0 mi West 3.5 mph - N/A   Mostly Cloudy
7:53 PM 34.0 °F 28.0 °F 25.0 °F 70% 29.63 in 10.0 mi SE 6.9 mph - N/A   Clear
8:53 PM 35.1 °F 30.1 °F 25.0 °F 67% 29.63 in 10.0 mi South 5.8 mph - N/A   Overcast
9:53 PM 34.0 °F 29.8 °F 25.0 °F 70% 29.63 in 10.0 mi SSW 4.6 mph - N/A   Partly Cloudy
10:53 PM 34.0 °F - 25.0 °F 70% 29.63 in 10.0 mi Calm Calm - N/A   Overcast
11:53 PM 33.1 °F 28.7 °F 26.1 °F 75% 29.63 in 10.0 mi SW 4.6 mph - N/A   Overcast