Weather History for Helena, MT

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Wednesday, December 12, 2012

  Actual Average Record
Temperature  
Mean Temperature 33 °F 22 °F  
Max Temperature 38 °F 32 °F 62 °F (1921)
Min Temperature 28 °F 12 °F -23 °F (1922)
Degree Days  
Heating Degree Days 32 43  
Month to date heating degree days 378 499  
Since 1 July heating degree days 2056 2381  
Cooling Degree Days 0 0  
Month to date cooling degree days 0 0  
Year to date cooling degree days 531 406  
Moisture  
Dew Point 28 °F    
Average Humidity 81    
Maximum Humidity 92    
Minimum Humidity 70    
Precipitation  
Precipitation 0.01 in 0.01 in 0.60 in (1937)
Month to date precipitation 0.47 0.17  
Year to date precipitation 9.37 10.99  
Snow  
Snow 0.00 in 0.30 in 5.70 in (1985)
Month to date snowfall 3.5 2.9  
Since 1 July snowfall 20.5 11.7  
Snow Depth 2.00 in    
Sea Level Pressure  
Sea Level Pressure 29.71 in    
Wind  
Wind Speed 2 mph (SW)    
Max Wind Speed 8 mph    
Max Gust Speed 10 mph    
Visibility 7 miles    
Events Snow    
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Date:

Astronomy

Dec. 12, 2012 Rise Set
Actual Time 8:03 AM MST 4:40 PM MST
Civil Twilight 7:28 AM MST 5:15 PM MST
Nautical Twilight 6:50 AM MST 5:53 PM MST
Astronomical Twilight 6:13 AM MST 6:30 PM MST
Moon 7:10 AM MST (12/12) 4:22 PM MST (12/12)
Length of Visible Light 9h 46m
Length of Day
8h 36m
Waning Crescent, 0% of the Moon is Illuminated
Dec 12
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 29.8 °F 26.1 °F 73% 29.61 in 10.0 mi SSE 4.6 mph - N/A   Overcast
1:53 AM 35.1 °F 31.0 °F 26.1 °F 70% 29.62 in 10.0 mi South 4.6 mph - N/A   Overcast
2:53 AM 33.1 °F - 26.1 °F 75% 29.59 in 10.0 mi Calm Calm - N/A   Overcast
3:53 AM 30.0 °F 25.2 °F 25.0 °F 82% 29.60 in 10.0 mi WNW 4.6 mph - N/A   Overcast
4:53 AM 32.0 °F 26.4 °F 26.1 °F 79% 29.62 in 10.0 mi West 5.8 mph - N/A   Overcast
5:53 AM 32.0 °F - 27.0 °F 82% 29.62 in 10.0 mi Calm Calm - N/A   Overcast
6:53 AM 32.0 °F 27.5 °F 28.0 °F 85% 29.64 in 3.0 mi SSE 4.6 mph - 0.00 in Snow Light Snow
7:03 AM 32.0 °F 28.7 °F 28.4 °F 87% 29.53 in 2.5 mi South 3.5 mph - 0.00 in Snow Light Snow
7:11 AM 32.0 °F 27.5 °F 28.4 °F 87% 29.53 in 3.0 mi South 4.6 mph - 0.01 in Snow Light Snow
7:38 AM 32.0 °F - 30.2 °F 93% 29.53 in 3.0 mi Calm Calm - 0.01 in Snow Light Snow
7:53 AM 32.0 °F - 30.0 °F 92% 29.65 in 9.0 mi Calm Calm - 0.01 in Snow Light Snow
8:51 AM 30.2 °F - 28.4 °F 93% 29.55 in 2.0 mi Calm Calm - 0.00 in Snow Light Snow
8:53 AM 30.0 °F - 28.0 °F 92% 29.68 in 2.0 mi Calm Calm - 0.00 in Snow Light Snow
9:07 AM 30.2 °F - 28.4 °F 93% 29.56 in 3.0 mi Calm Calm - 0.00 in Snow Light Snow
9:14 AM 30.2 °F - 28.4 °F 93% 29.56 in 2.0 mi Calm Calm - 0.00 in Snow Light Snow
9:53 AM 30.9 °F - 28.0 °F 89% 29.69 in 4.0 mi Calm Calm - 0.00 in   Overcast
10:53 AM 32.0 °F 27.5 °F 28.9 °F 88% 29.72 in 9.0 mi West 4.6 mph - N/A   Overcast
11:36 AM 33.8 °F - 30.2 °F 87% 29.60 in 2.5 mi Calm Calm - 0.00 in Snow Light Snow
11:50 AM 33.8 °F - 30.2 °F 87% 29.60 in 5.0 mi Calm Calm - 0.00 in Snow Light Snow
11:53 AM 33.1 °F - 30.0 °F 89% 29.72 in 5.0 mi Calm Calm - 0.00 in Snow Light Snow
12:53 PM 33.1 °F - 30.9 °F 92% 29.73 in 9.0 mi Calm Calm - 0.00 in   Overcast
1:53 PM 34.0 °F - 30.9 °F 89% 29.74 in 10.0 mi Calm Calm - N/A   Overcast
2:53 PM 33.1 °F 30.0 °F 30.0 °F 89% 29.77 in 10.0 mi ENE 3.5 mph - N/A   Partly Cloudy
3:53 PM 35.1 °F - 30.0 °F 82% 29.81 in 10.0 mi Calm Calm - N/A   Overcast
4:53 PM 34.0 °F - 28.9 °F 82% 29.83 in 10.0 mi Calm Calm - N/A   Overcast
5:53 PM 32.0 °F 28.7 °F 28.0 °F 85% 29.86 in 10.0 mi NW 3.5 mph - N/A   Overcast
6:53 PM 30.0 °F 24.1 °F 28.0 °F 92% 29.88 in 7.0 mi NW 5.8 mph - N/A   Overcast
7:53 PM 30.0 °F - 28.0 °F 92% 29.89 in 8.0 mi Calm Calm - N/A   Overcast
8:53 PM 30.0 °F - 28.0 °F 92% 29.92 in 9.0 mi Calm Calm - N/A   Overcast
9:53 PM 28.9 °F 25.2 °F 27.0 °F 92% 29.93 in 7.0 mi NE 3.5 mph - N/A   Overcast
10:53 PM 28.9 °F 25.2 °F 26.1 °F 89% 29.94 in 8.0 mi West 3.5 mph - N/A   Overcast
11:11 PM 30.2 °F - 26.6 °F 86% 29.81 in 9.0 mi Calm Calm - N/A   Overcast
11:19 PM 30.2 °F - 26.6 °F 86% 29.81 in 9.0 mi Calm Calm - N/A   Overcast
11:53 PM 28.9 °F 25.2 °F 27.0 °F 92% 29.95 in 10.0 mi South 3.5 mph - N/A   Overcast