Weather History for Helena, MT

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Saturday, January 12, 2013

  Actual Average Record
Temperature  
Mean Temperature -1 °F 23 °F  
Max Temperature 6 °F 33 °F 57 °F (1959)
Min Temperature -8 °F 12 °F -33 °F (1997)
Degree Days  
Heating Degree Days 66 42  
Month to date heating degree days 561 519  
Since 1 July heating degree days 3482 3740  
Cooling Degree Days 0 0  
Month to date cooling degree days 0 0  
Year to date cooling degree days 0 0  
Moisture  
Dew Point -4 °F    
Average Humidity 87    
Maximum Humidity 95    
Minimum Humidity 79    
Precipitation  
Precipitation T in 0.01 in 1.13 in (1881)
Month to date precipitation 0.34 0.15  
Year to date precipitation 0.34 0.15  
Snow  
Snow T in 0.20 in 13.00 in (1927)
Month to date snowfall 3.0 2.4  
Since 1 July snowfall 27.1 18.5  
Snow Depth 3.00 in    
Sea Level Pressure  
Sea Level Pressure 30.37 in    
Wind  
Wind Speed 1 mph (NW)    
Max Wind Speed 6 mph    
Max Gust Speed 7 mph    
Visibility 8 miles    
Events Snow    
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Astronomy

Jan. 12, 2013 Rise Set
Actual Time 8:09 AM MST 5:03 PM MST
Civil Twilight 7:35 AM MST 5:38 PM MST
Nautical Twilight 6:57 AM MST 6:15 PM MST
Astronomical Twilight 6:21 AM MST 6:52 PM MST
Moon 8:24 AM MST (1/12) 6:45 PM MST (1/12)
Length of Visible Light 10h 02m
Length of Day
8h 54m
New Moon, 1% of the Moon is Illuminated
Jan 12
New Moon
Jan 18
First Quarter
Jan 26
Full
Feb 3
Last Quarter
Feb 10
New

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 1.4 °F - -4.0 °F 78% 30.07 in 10.0 mi Calm Calm - N/A   Scattered Clouds
1:53 AM -0.9 °F -8.9 °F -5.1 °F 83% 30.36 in 10.0 mi NW 3.5 mph - N/A   Overcast
2:53 AM -0.9 °F - -5.1 °F 83% 30.37 in 10.0 mi Calm Calm - N/A   Clear
3:53 AM -2.0 °F -10.1 °F -6.0 °F 83% 30.36 in 10.0 mi West 3.5 mph - N/A   Unknown
4:53 AM -2.0 °F -10.1 °F -6.0 °F 83% 30.36 in 10.0 mi WSW 3.5 mph - N/A   Clear
5:53 AM -5.1 °F - -9.0 °F 83% 30.36 in 10.0 mi Calm Calm - N/A   Clear
6:53 AM -5.1 °F -15.8 °F -9.0 °F 83% 30.38 in 10.0 mi West 4.6 mph - N/A   Clear
7:53 AM -5.1 °F - -9.9 °F 80% 30.40 in 10.0 mi Calm Calm - N/A   Clear
8:53 AM -4.0 °F -12.4 °F -8.0 °F 83% 30.42 in 10.0 mi West 3.5 mph - N/A   Mostly Cloudy
9:53 AM -2.9 °F -11.2 °F -8.0 °F 79% 30.43 in 5.0 mi ENE 3.5 mph - N/A   Haze
10:53 AM -2.0 °F - -7.1 °F 79% 30.43 in 3.0 mi Calm Calm - 0.00 in   Haze
11:53 AM -0.0 °F - -5.1 °F 79% 30.42 in 9.0 mi Calm Calm - N/A   Overcast
12:53 PM 3.0 °F -6.4 °F -2.9 °F 76% 30.42 in 3.0 mi NW 4.6 mph - 0.00 in Snow Light Snow
1:08 PM 3.2 °F -4.2 °F -2.2 °F 78% 30.12 in 2.5 mi NW 3.5 mph - 0.00 in Snow Light Snow
1:22 PM 5.0 °F - -0.4 °F 78% 30.11 in 3.0 mi Calm Calm - 0.00 in Snow Light Snow
1:53 PM 5.0 °F -2.1 °F -2.0 °F 73% 30.43 in 5.0 mi NNE 3.5 mph - 0.00 in   Haze
2:35 PM 3.2 °F - -0.4 °F 85% 30.13 in 1.8 mi Calm Calm - 0.00 in Snow Light Snow
2:53 PM 3.9 °F - -0.9 °F 80% 30.43 in 3.0 mi Calm Calm - 0.00 in   Haze
3:53 PM 5.0 °F - -0.9 °F 76% 30.44 in 10.0 mi Calm Calm - N/A   Mostly Cloudy
4:53 PM 3.9 °F - -2.0 °F 76% 30.45 in 10.0 mi Calm Calm - N/A   Scattered Clouds
5:53 PM 1.4 °F - -0.4 °F 92% 30.14 in 10.0 mi Calm Calm - N/A   Clear
6:53 PM -0.0 °F - -5.1 °F 79% 30.48 in 9.0 mi Calm Calm - N/A   Mostly Cloudy
7:53 PM 1.9 °F - -2.0 °F 83% 30.48 in 9.0 mi Calm Calm - N/A   Overcast
8:53 PM 1.0 °F -6.7 °F -2.9 °F 83% 30.48 in 9.0 mi NNW 3.5 mph - N/A   Overcast
9:53 PM -0.0 °F - -4.0 °F 83% 30.48 in 10.0 mi Calm Calm - N/A   Overcast
10:53 PM 1.9 °F - -2.0 °F 83% 30.47 in 8.0 mi Calm Calm - N/A   Overcast
11:53 PM 1.9 °F - -2.0 °F 83% 30.47 in 8.0 mi Calm Calm - N/A   Overcast