Weather History for Helena, MT

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Week of December 9, 2012 through December 15, 2012

  Max Avg Min Sum
Temperature  
Max Temperature 44 °F 33 °F 22 °F
Mean Temperature 37 °F 26 °F 12 °F
Min Temperature 30 °F 18 °F -4 °F
Degree Days  
Heating Degree Days (base 65) 53 39 28 276
Cooling Degree Days (base 65) 0 0 0 0
Growing Degree Days (base 50) 0 0 0 0
Dew Point  
Dew Point 31 °F 17 °F -8 °F
Precipitation  
Precipitation 0.01 in 0.00 in 0.00 in 0.01 in
Snowdepth 3.0 in 1.9 in 1.0 in -
Wind  
Wind 30 mph 5 mph 0 mph
Gust Wind 37 mph 24 mph 18 mph
Sea Level Pressure  
Sea Level Pressure 30.60 in 29.94 in 29.53 in

Weekly Weather History Graph

Weekly Weather History Graph

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Astronomy

Dec. 11, 2012 Rise Set
Actual Time 8:02 AM MST 4:40 PM MST
Civil Twilight 7:27 AM MST 5:15 PM MST
Nautical Twilight 6:49 AM MST 5:53 PM MST
Astronomical Twilight 6:12 AM MST 6:30 PM MST
Moon 5:58 AM MST (12/11) 3:25 PM MST (12/11)
Length of Visible Light 9h 47m
Length of Day
8h 37m
Waning Crescent, 4% of the Moon is Illuminated
Dec 11
Waning Crescent
Dec 13
New
Dec 19
First Quarter
Dec 28
Full
Jan 4
Last Quarter

Daily Weather History & Observations

2012 Temp. (°F) Dew Point (°F) Humidity (%) Sea Level Press. (in) Visibility (mi) Wind (mph) Precip. (in) Events
Dec high avg low high avg low high avg low high avg low high avg low high avg high sum  
9 27 12 -4 15 1 -8 95 71 46 30.60 30.39 30.20 10 8 0 30 5 36 0.00 Fog
10 34 30 26 23 19 16 69 60 51 30.18 30.08 29.89 10 10 5 29 15 37 T Snow
11 44 37 30 26 24 20 78 58 37 30.01 29.76 29.60 10 10 10 21 6 26 0.00  
12 38 33 28 31 28 25 92 81 70 29.95 29.71 29.53 10 7 2 8 2 10 0.01 Snow
13 35 28 20 27 19 12 92 72 52 30.03 29.96 29.78 10 10 8 16 5 18 T  
14 22 18 13 18 15 10 100 89 77 29.98 29.81 29.64 10 3 0 7 1 8 0.00 Fog
15 28 21 13 22 13 10 92 83 73 30.03 29.85 29.77 10 4 0 7 1 9 0.00 Fog