Weather History for Helena, MT

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Monday, January 21, 2013

  Actual Average Record
Temperature  
Mean Temperature 24 °F 24 °F  
Max Temperature 32 °F 34 °F 52 °F (1950)
Min Temperature 15 °F 14 °F -32 °F (1962)
Degree Days  
Heating Degree Days 41 41  
Month to date heating degree days 936 893  
Since 1 July heating degree days 3857 4114  
Cooling Degree Days 0 0  
Month to date cooling degree days 0 0  
Year to date cooling degree days 0 0  
Moisture  
Dew Point 16 °F    
Average Humidity 78    
Maximum Humidity 92    
Minimum Humidity 63    
Precipitation  
Precipitation 0.00 in 0.01 in 0.52 in (1969)
Month to date precipitation 0.35 0.25  
Year to date precipitation 0.35 0.25  
Snow  
Snow 0.00 in 0.20 in 6.70 in (1969)
Month to date snowfall 5.3 4.2  
Since 1 July snowfall 29.4 20.3  
Snow Depth 1.00 in    
Sea Level Pressure  
Sea Level Pressure 30.34 in    
Wind  
Wind Speed 2 mph (WNW)    
Max Wind Speed 7 mph    
Max Gust Speed 9 mph    
Visibility 8 miles    
Events      
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Astronomy

Jan. 21, 2013 Rise Set
Actual Time 8:03 AM MST 5:16 PM MST
Civil Twilight 7:29 AM MST 5:49 PM MST
Nautical Twilight 6:52 AM MST 6:26 PM MST
Astronomical Twilight 6:16 AM MST 7:02 PM MST
Moon 12:57 PM MST (1/21) 3:35 AM MST (1/21)
Length of Visible Light 10h 19m
Length of Day
9h 12m
Waxing Gibbous, 75% of the Moon is Illuminated
Jan 21
Waxing Gibbous
Jan 26
Full
Feb 3
Last Quarter
Feb 10
New
Feb 17
First 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 21.9 °F - 17.1 °F 82% 30.42 in 10.0 mi Calm Calm - N/A   Overcast
1:53 AM 21.0 °F - 16.0 °F 81% 30.40 in 10.0 mi Calm Calm - N/A   Clear
2:53 AM 21.0 °F - 16.0 °F 81% 30.41 in 10.0 mi Calm Calm - N/A   Clear
3:53 AM 21.9 °F 17.2 °F 16.0 °F 78% 30.39 in 10.0 mi West 3.5 mph - N/A   Mostly Cloudy
4:53 AM 19.0 °F - 16.0 °F 88% 30.40 in 10.0 mi Calm Calm - N/A   Partly Cloudy
5:53 AM 19.0 °F - 15.1 °F 85% 30.40 in 10.0 mi Calm Calm - N/A   Clear
6:53 AM 18.0 °F - 14.0 °F 84% 30.41 in 10.0 mi Calm Calm - N/A   Partly Cloudy
7:53 AM 16.0 °F 10.4 °F 14.0 °F 92% 30.40 in 8.0 mi NW 3.5 mph - N/A   Clear
8:53 AM 19.9 °F 14.9 °F 15.1 °F 81% 30.39 in 6.0 mi NW 3.5 mph - N/A   Haze
9:53 AM 19.9 °F 14.9 °F 15.1 °F 81% 30.40 in 6.0 mi NNW 3.5 mph - N/A   Haze
10:53 AM 21.0 °F - 15.1 °F 78% 30.40 in 7.0 mi Calm Calm - N/A   Clear
11:53 AM 23.0 °F - 17.1 °F 78% 30.37 in 7.0 mi Calm Calm - N/A   Clear
12:53 PM 24.1 °F - 17.1 °F 75% 30.33 in 10.0 mi Calm Calm - N/A   Scattered Clouds
1:53 PM 27.0 °F - 18.0 °F 69% 30.29 in 6.0 mi Calm Calm - N/A   Haze
2:53 PM 27.0 °F 23.0 °F 18.0 °F 69% 30.27 in 7.0 mi West 3.5 mph - N/A   Clear
3:53 PM 30.0 °F - 19.0 °F 64% 30.25 in 7.0 mi Calm Calm - N/A   Clear
4:53 PM 28.0 °F - 18.0 °F 66% 30.25 in 8.0 mi Calm Calm - N/A   Clear
5:53 PM 27.0 °F 23.0 °F 18.0 °F 69% 30.25 in 8.0 mi West 3.5 mph - N/A   Clear
6:53 PM 27.0 °F - 18.0 °F 69% 30.26 in 9.0 mi Calm Calm - N/A   Clear
7:53 PM 25.0 °F 19.3 °F 18.0 °F 75% 30.27 in 9.0 mi NW 4.6 mph - N/A   Clear
8:53 PM 25.0 °F 18.1 °F 18.0 °F 75% 30.26 in 9.0 mi West 5.8 mph - N/A   Clear
9:53 PM 23.0 °F - 17.1 °F 78% 30.27 in 9.0 mi Calm Calm - N/A   Clear
10:53 PM 21.0 °F 13.4 °F 15.1 °F 78% 30.29 in 10.0 mi NNW 5.8 mph - N/A   Clear
11:53 PM 21.0 °F 13.4 °F 15.1 °F 78% 30.28 in 9.0 mi SW 5.8 mph - N/A   Clear