Weather History for Helena, MT

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Week of December 25, 2011 through December 31, 2011

  Max Avg Min Sum
Temperature  
Max Temperature 53 °F 45 °F 36 °F
Mean Temperature 42 °F 35 °F 29 °F
Min Temperature 31 °F 25 °F 20 °F
Degree Days  
Heating Degree Days (base 65) 36 30 23 210
Cooling Degree Days (base 65) 0 0 0 0
Growing Degree Days (base 50) 0 0 0 0
Dew Point  
Dew Point 37 °F 21 °F 9 °F
Precipitation  
Precipitation 0.02 in 0.01 in 0.00 in 0.02 in
Snowdepth 0.0 in 0.0 in 0.0 in -
Wind  
Wind 45 mph 10 mph 0 mph
Gust Wind 62 mph 28 mph 18 mph
Sea Level Pressure  
Sea Level Pressure 30.56 in 30.02 in 29.49 in

Weekly Weather History Graph

Weekly Weather History Graph

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Date:

Astronomy

Dec. 31, 2011 Rise Set
Actual Time 8:12 AM MST 4:49 PM MST
Civil Twilight 7:37 AM MST 5:24 PM MST
Nautical Twilight 6:58 AM MST 6:03 PM MST
Astronomical Twilight 6:22 AM MST 6:39 PM MST
Moon 11:31 AM MST (12/31) No Moon Set
Length of Visible Light 9h 47m
Length of Day
8h 37m
Waxing Crescent, 45% of the Moon is Illuminated
Dec 31
Waxing Crescent
Dec 31
First Quarter
Jan 9
Full
Jan 16
Last Quarter
Jan 23
New

Daily Weather History & Observations

2011 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  
25 44 33 22 22 20 15 84 59 33 30.56 30.25 29.92 10 10 10 25 5 39 0.00  
26 40 30 20 21 16 14 74 56 37 30.33 30.25 30.06 10 10 10 26 10 35 T  
27 45 33 20 26 20 15 81 61 41 30.22 30.12 29.93 10 10 10 24 6 31 0.00  
28 53 42 31 36 30 23 85 63 41 29.91 29.85 29.69 10 10 10 25 10 31 T  
29 50 40 29 36 22 16 82 59 36 30.01 29.80 29.56 10 10 10 45 17 62 T Rain
30 47 38 29 37 28 18 76 67 58 29.86 29.68 29.49 10 10 10 21 6 31 0.02 Rain
31 36 29 22 24 12 9 70 53 35 30.56 30.22 29.74 10 10 10 35 13 46 T