Weather History for Helena, MT

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Wednesday, December 12, 2012

  Actual Average Record
Temperature  
Mean Temperature 1 °C -6 °C  
Max Temperature 3 °C 0 °C 16 °C (1921)
Min Temperature -2 °C -11 °C -30 °C (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 -2 °C    
Average Humidity 81    
Maximum Humidity 92    
Minimum Humidity 70    
Precipitation  
Precipitation 0.25 mm 0.25 mm 1.52 mm (1937)
Month to date precipitation 0.47 0.17  
Year to date precipitation 9.37 10.99  
Snow  
Snow 0.00 cm 0.76 cm 14.48 cm (1985)
Month to date snowfall 3.5 2.9  
Since 1 July snowfall 20.5 11.7  
Snow Depth 5.08 cm    
Sea Level Pressure  
Sea Level Pressure 1006 hPa    
Wind  
Wind Speed 4 km/h (SW)    
Max Wind Speed 13 km/h    
Max Gust Speed 16 km/h    
Visibility 12 kilometers    
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 1.1 °C -1.2 °C -3.3 °C 73% 1002.6 hPa 16.1 km SSE 7.4 km/h / 2.1 m/s - N/A   Overcast
1:53 AM 1.7 °C -0.5 °C -3.3 °C 70% 1002.8 hPa 16.1 km South 7.4 km/h / 2.1 m/s - N/A   Overcast
2:53 AM 0.6 °C - -3.3 °C 75% 1002.0 hPa 16.1 km Calm Calm - N/A   Overcast
3:53 AM -1.1 °C -3.8 °C -3.9 °C 82% 1002.3 hPa 16.1 km WNW 7.4 km/h / 2.1 m/s - N/A   Overcast
4:53 AM 0.0 °C -3.1 °C -3.3 °C 79% 1002.8 hPa 16.1 km West 9.3 km/h / 2.6 m/s - N/A   Overcast
5:53 AM 0.0 °C - -2.8 °C 82% 1002.9 hPa 16.1 km Calm Calm - N/A   Overcast
6:53 AM 0.0 °C -2.5 °C -2.2 °C 85% 1003.5 hPa 4.8 km SSE 7.4 km/h / 2.1 m/s - 0.0 mm Snow Light Snow
7:03 AM 0.0 °C -1.8 °C -2.0 °C 87% 999.9 hPa 4.0 km South 5.6 km/h / 1.5 m/s - 0.0 mm Snow Light Snow
7:11 AM 0.0 °C -2.5 °C -2.0 °C 87% 999.9 hPa 4.8 km South 7.4 km/h / 2.1 m/s - 0.3 mm Snow Light Snow
7:38 AM 0.0 °C - -1.0 °C 93% 999.9 hPa 4.8 km Calm Calm - 0.3 mm Snow Light Snow
7:53 AM 0.0 °C - -1.1 °C 92% 1004.1 hPa 14.5 km Calm Calm - 0.3 mm Snow Light Snow
8:51 AM -1.0 °C - -2.0 °C 93% 1000.6 hPa 3.2 km Calm Calm - 0.0 mm Snow Light Snow
8:53 AM -1.1 °C - -2.2 °C 92% 1004.8 hPa 3.2 km Calm Calm - 0.0 mm Snow Light Snow
9:07 AM -1.0 °C - -2.0 °C 93% 1000.9 hPa 4.8 km Calm Calm - 0.0 mm Snow Light Snow
9:14 AM -1.0 °C - -2.0 °C 93% 1000.9 hPa 3.2 km Calm Calm - 0.0 mm Snow Light Snow
9:53 AM -0.6 °C - -2.2 °C 89% 1005.4 hPa 6.4 km Calm Calm - 0.0 mm   Overcast
10:53 AM 0.0 °C -2.5 °C -1.7 °C 88% 1006.2 hPa 14.5 km West 7.4 km/h / 2.1 m/s - N/A   Overcast
11:36 AM 1.0 °C - -1.0 °C 87% 1002.3 hPa 4.0 km Calm Calm - 0.0 mm Snow Light Snow
11:50 AM 1.0 °C - -1.0 °C 87% 1002.3 hPa 8.0 km Calm Calm - 0.0 mm Snow Light Snow
11:53 AM 0.6 °C - -1.1 °C 89% 1006.3 hPa 8.0 km Calm Calm - 0.0 mm Snow Light Snow
12:53 PM 0.6 °C - -0.6 °C 92% 1006.7 hPa 14.5 km Calm Calm - 0.0 mm   Overcast
1:53 PM 1.1 °C - -0.6 °C 89% 1007.0 hPa 16.1 km Calm Calm - N/A   Overcast
2:53 PM 0.6 °C -1.1 °C -1.1 °C 89% 1008.1 hPa 16.1 km ENE 5.6 km/h / 1.5 m/s - N/A   Partly Cloudy
3:53 PM 1.7 °C - -1.1 °C 82% 1009.2 hPa 16.1 km Calm Calm - N/A   Overcast
4:53 PM 1.1 °C - -1.7 °C 82% 1010.1 hPa 16.1 km Calm Calm - N/A   Overcast
5:53 PM 0.0 °C -1.8 °C -2.2 °C 85% 1011.1 hPa 16.1 km NW 5.6 km/h / 1.5 m/s - N/A   Overcast
6:53 PM -1.1 °C -4.4 °C -2.2 °C 92% 1011.8 hPa 11.3 km NW 9.3 km/h / 2.6 m/s - N/A   Overcast
7:53 PM -1.1 °C - -2.2 °C 92% 1012.2 hPa 12.9 km Calm Calm - N/A   Overcast
8:53 PM -1.1 °C - -2.2 °C 92% 1013.1 hPa 14.5 km Calm Calm - N/A   Overcast
9:53 PM -1.7 °C -3.8 °C -2.8 °C 92% 1013.5 hPa 11.3 km NE 5.6 km/h / 1.5 m/s - N/A   Overcast
10:53 PM -1.7 °C -3.8 °C -3.3 °C 89% 1013.8 hPa 12.9 km West 5.6 km/h / 1.5 m/s - N/A   Overcast
11:11 PM -1.0 °C - -3.0 °C 86% 1009.4 hPa 14.5 km Calm Calm - N/A   Overcast
11:19 PM -1.0 °C - -3.0 °C 86% 1009.4 hPa 14.5 km Calm Calm - N/A   Overcast
11:53 PM -1.7 °C -3.8 °C -2.8 °C 92% 1014.1 hPa 16.1 km South 5.6 km/h / 1.5 m/s - N/A   Overcast