Weather History for Helena, MT

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Sunday, December 9, 2012

  Actual Average Record
Temperature  
Mean Temperature 12 °F 22 °F  
Max Temperature 27 °F 32 °F 59 °F (1957)
Min Temperature -4 °F 13 °F -30 °F (1972)
Degree Days  
Heating Degree Days 53 42  
Month to date heating degree days 283 370  
Since 1 July heating degree days 1961 2252  
Cooling Degree Days 0 0  
Month to date cooling degree days 0 0  
Year to date cooling degree days 531 406  
Moisture  
Dew Point 1 °F    
Average Humidity 71    
Maximum Humidity 95    
Minimum Humidity 46    
Precipitation  
Precipitation 0.00 in 0.01 in 0.49 in (1917)
Month to date precipitation 0.46 0.13  
Year to date precipitation 9.36 10.95  
Snow  
Snow 0.00 in 0.20 in 18.00 in (1906)
Month to date snowfall 3.5 2.1  
Since 1 July snowfall 20.5 10.9  
Snow Depth 3.00 in    
Sea Level Pressure  
Sea Level Pressure 30.39 in    
Wind  
Wind Speed 5 mph (West)    
Max Wind Speed 30 mph    
Max Gust Speed 36 mph    
Visibility 8 miles    
Events Fog    
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Astronomy

Dec. 09, 2012 Rise Set
Actual Time 8:00 AM MST 4:40 PM MST
Civil Twilight 7:25 AM MST 5:15 PM MST
Nautical Twilight 6:47 AM MST 5:53 PM MST
Astronomical Twilight 6:10 AM MST 6:30 PM MST
Moon 3:26 AM MST (12/9) 1:59 PM MST (12/9)
Length of Visible Light 9h 49m
Length of Day
8h 39m
Waning Crescent, 18% of the Moon is Illuminated
Dec 9
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 3.9 °F - -0.0 °F 84% 30.45 in 10.0 mi Calm Calm - N/A   Clear
1:53 AM 1.9 °F -5.6 °F -2.9 °F 80% 30.47 in 10.0 mi NNW 3.5 mph - N/A   Clear
2:53 AM 1.0 °F - -2.9 °F 83% 30.48 in 10.0 mi Calm Calm - N/A   Clear
3:53 AM 1.0 °F -6.7 °F -2.9 °F 83% 30.49 in 10.0 mi SSE 3.5 mph - N/A   Clear
4:53 AM 1.0 °F - -2.9 °F 83% 30.52 in 10.0 mi Calm Calm - N/A   Clear
5:53 AM -0.9 °F -8.9 °F -4.0 °F 87% 30.55 in 10.0 mi NNW 3.5 mph - N/A   Clear
6:53 AM -2.9 °F - -6.0 °F 87% 30.58 in 10.0 mi Calm Calm - N/A   Clear
7:25 AM -4.0 °F - -7.6 °F 85% 30.29 in 8.0 mi Calm Calm - N/A   Scattered Clouds
7:29 AM -4.0 °F - -7.6 °F 85% 30.29 in 0.8 mi Calm Calm - N/A   Mist
7:39 AM -2.2 °F - -5.8 °F 85% 30.28 in 0.2 mi Calm Calm - N/A Fog Light Freezing Fog
7:46 AM -2.2 °F - -5.8 °F 85% 30.29 in 1.0 mi Calm Calm - N/A   Mist
7:53 AM -2.9 °F - -7.1 °F 82% 30.59 in 1.0 mi Calm Calm - N/A   Mist
7:56 AM -2.2 °F - -5.8 °F 85% 30.29 in 0.2 mi Calm Calm - N/A Fog Light Freezing Fog
8:20 AM -2.2 °F - -7.6 °F 78% 30.29 in 0.2 mi Calm Calm - N/A Fog Light Freezing Fog
8:29 AM -2.2 °F - -5.8 °F 85% 30.30 in 1.0 mi Calm Calm - N/A   Mist
8:31 AM -2.2 °F - -5.8 °F 85% 30.29 in 1.5 mi Calm Calm - N/A   Partly Cloudy
8:37 AM -2.2 °F - -5.8 °F 85% 30.30 in 3.0 mi Calm Calm - N/A   Partly Cloudy
8:53 AM -2.9 °F - -6.0 °F 87% 30.60 in 5.0 mi Calm Calm - N/A   Clear
9:53 AM 1.9 °F - -0.0 °F 91% 30.58 in 8.0 mi Calm Calm - N/A   Clear
10:53 AM 1.0 °F - -2.9 °F 83% 30.57 in 10.0 mi Calm Calm - N/A   Partly Cloudy
10:55 AM 1.4 °F - -2.2 °F 85% 30.27 in 1.2 mi Calm Calm - N/A   Haze
11:02 AM 1.4 °F - -2.2 °F 85% 30.27 in 10.0 mi Calm Calm - N/A   Clear
11:53 AM 7.0 °F - 3.0 °F 84% 30.53 in 10.0 mi Calm Calm - N/A   Clear
12:53 PM 10.0 °F 1.8 °F 3.0 °F 73% 30.48 in 10.0 mi NW 4.6 mph - N/A   Clear
1:53 PM 14.0 °F - 6.1 °F 71% 30.44 in 10.0 mi Calm Calm - N/A   Partly Cloudy
2:53 PM 12.9 °F - 7.0 °F 77% 30.43 in 10.0 mi Calm Calm - N/A   Overcast
3:53 PM 15.1 °F 9.4 °F 9.0 °F 77% 30.39 in 10.0 mi North 3.5 mph - N/A   Overcast
4:53 PM 18.0 °F 9.8 °F 10.9 °F 74% 30.35 in 10.0 mi WSW 5.8 mph - N/A   Overcast
5:53 PM 24.1 °F 11.0 °F 6.1 °F 46% 30.31 in 10.0 mi West 16.1 mph 26.5 mph N/A   Overcast
6:53 PM 24.1 °F 13.7 °F 7.0 °F 48% 30.31 in 10.0 mi West 10.4 mph 26.5 mph N/A   Mostly Cloudy
7:53 PM 24.1 °F 13.1 °F 9.0 °F 53% 30.30 in 10.0 mi West 11.5 mph 18.4 mph N/A   Mostly Cloudy
8:53 PM 25.0 °F 13.6 °F 9.0 °F 51% 30.28 in 10.0 mi SW 12.7 mph 24.2 mph N/A   Scattered Clouds
9:53 PM 26.1 °F 14.5 °F 12.0 °F 55% 30.27 in 10.0 mi WSW 13.8 mph 19.6 mph N/A   Overcast
10:53 PM 25.0 °F 13.1 °F 14.0 °F 63% 30.24 in 10.0 mi WSW 13.8 mph 26.5 mph N/A   Overcast
11:53 PM 25.0 °F 19.3 °F 15.1 °F 66% 30.20 in 10.0 mi NW 4.6 mph - N/A   Overcast