Weather History for Helena, MT

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Monday, December 10, 2012

  Actual Average Record
Temperature  
Mean Temperature 30 °F 22 °F  
Max Temperature 34 °F 32 °F 63 °F (1939)
Min Temperature 26 °F 13 °F -27 °F (1972)
Degree Days  
Heating Degree Days 35 43  
Month to date heating degree days 318 413  
Since 1 July heating degree days 1996 2295  
Cooling Degree Days 0 0  
Month to date cooling degree days 0 0  
Year to date cooling degree days 531 406  
Moisture  
Dew Point 19 °F    
Average Humidity 60    
Maximum Humidity 69    
Minimum Humidity 51    
Precipitation  
Precipitation T in 0.01 in 0.51 in (1929)
Month to date precipitation 0.46 0.14  
Year to date precipitation 9.36 10.96  
Snow  
Snow T in 0.30 in 3.20 in (1929)
Month to date snowfall 3.5 2.4  
Since 1 July snowfall 20.5 11.2  
Snow Depth 3.00 in    
Sea Level Pressure  
Sea Level Pressure 30.08 in    
Wind  
Wind Speed 15 mph (West)    
Max Wind Speed 29 mph    
Max Gust Speed 37 mph    
Visibility 10 miles    
Events Snow    
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Daily Weather History Graph

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Astronomy

Dec. 10, 2012 Rise Set
Actual Time 8:01 AM MST 4:40 PM MST
Civil Twilight 7:26 AM MST 5:15 PM MST
Nautical Twilight 6:48 AM MST 5:53 PM MST
Astronomical Twilight 6:11 AM MST 6:30 PM MST
Moon 4:42 AM MST (12/10) 2:38 PM MST (12/10)
Length of Visible Light 9h 48m
Length of Day
8h 38m
Waning Crescent, 10% of the Moon is Illuminated
Dec 10
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 27.0 °F 19.5 °F 16.0 °F 63% 30.18 in 10.0 mi WSW 6.9 mph - N/A   Overcast
1:53 AM 28.0 °F 21.7 °F 17.1 °F 63% 30.13 in 10.0 mi WSW 5.8 mph - N/A   Overcast
2:53 AM 28.0 °F 22.8 °F 17.1 °F 63% 30.13 in 10.0 mi North 4.6 mph - N/A   Overcast
3:53 AM 28.0 °F 20.8 °F 18.0 °F 66% 30.12 in 10.0 mi West 6.9 mph - N/A   Overcast
4:53 AM 28.0 °F 20.8 °F 19.0 °F 69% 30.11 in 10.0 mi West 6.9 mph - N/A   Overcast
5:53 AM 30.2 °F 20.2 °F 19.4 °F 64% 29.89 in 10.0 mi West 12.7 mph - N/A   Scattered Clouds
6:53 AM 28.9 °F - 19.9 °F 69% 30.08 in 5.0 mi Calm Calm - N/A   Haze
7:18 AM 30.2 °F 17.8 °F 21.2 °F 69% 29.91 in 5.0 mi West 19.6 mph 23.0 mph N/A Snow Light Snow
7:53 AM 32.0 °F 19.5 °F 19.0 °F 59% 30.07 in 10.0 mi West 21.9 mph 27.6 mph 0.00 in   Overcast
8:53 AM 30.9 °F 18.1 °F 19.0 °F 61% 30.08 in 10.0 mi West 21.9 mph 33.4 mph N/A   Mostly Cloudy
9:53 AM 30.9 °F 18.4 °F 18.0 °F 59% 30.11 in 10.0 mi West 20.7 mph 29.9 mph N/A   Mostly Cloudy
10:53 AM 32.0 °F 18.9 °F 19.0 °F 59% 30.12 in 10.0 mi West 24.2 mph 32.2 mph N/A   Clear
11:53 AM 33.1 °F 21.2 °F 18.0 °F 54% 30.12 in 10.0 mi West 20.7 mph 33.4 mph N/A   Clear
12:53 PM 33.1 °F 19.8 °F 17.1 °F 52% 30.10 in 10.0 mi West 26.5 mph 35.7 mph N/A   Clear
1:53 PM 33.1 °F 21.5 °F 18.0 °F 54% 30.08 in 10.0 mi West 19.6 mph 35.7 mph N/A   Clear
2:53 PM 33.1 °F 22.2 °F 17.1 °F 52% 30.06 in 10.0 mi West 17.3 mph 25.3 mph N/A   Partly Cloudy
3:53 PM 33.1 °F 23.0 °F 18.0 °F 54% 30.08 in 10.0 mi West 15.0 mph 24.2 mph N/A   Overcast
4:53 PM 30.9 °F 19.4 °F 21.0 °F 67% 30.08 in 10.0 mi West 17.3 mph - N/A   Mostly Cloudy
5:53 PM 32.0 °F 20.8 °F 21.0 °F 64% 30.09 in 10.0 mi West 17.3 mph - N/A   Mostly Cloudy
6:53 PM 30.9 °F 19.4 °F 19.9 °F 64% 30.09 in 10.0 mi West 17.3 mph - N/A   Mostly Cloudy
7:53 PM 32.0 °F 19.8 °F 19.0 °F 59% 30.08 in 10.0 mi West 20.7 mph 25.3 mph N/A   Scattered Clouds
8:53 PM 32.0 °F 20.8 °F 19.9 °F 61% 30.07 in 10.0 mi West 17.3 mph - N/A   Mostly Cloudy
9:53 PM 33.1 °F 22.2 °F 21.0 °F 61% 30.05 in 10.0 mi West 17.3 mph 25.3 mph N/A   Overcast
10:53 PM 33.1 °F 21.9 °F 21.9 °F 64% 30.04 in 10.0 mi West 18.4 mph 27.6 mph N/A   Overcast
11:53 PM 33.1 °F 27.7 °F 23.0 °F 66% 30.04 in 10.0 mi West 5.8 mph - N/A   Overcast