Weather History for Helena, MT

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Week of February 17, 2013 through February 23, 2013

  Max Avg Min Sum
Temperature  
Max Temperature 43 °F 39 °F 36 °F
Mean Temperature 35 °F 31 °F 27 °F
Min Temperature 28 °F 23 °F 18 °F
Degree Days  
Heating Degree Days (base 65) 38 34 30 236
Cooling Degree Days (base 65) 0 0 0 0
Growing Degree Days (base 50) 0 0 0 0
Dew Point  
Dew Point 30 °F 18 °F 8 °F
Precipitation  
Precipitation 0.02 in 0.01 in 0.00 in 0.05 in
Snowdepth 1.0 in 0.2 in 0.0 in -
Wind  
Wind 29 mph 8 mph 0 mph
Gust Wind 41 mph 26 mph 16 mph
Sea Level Pressure  
Sea Level Pressure 30.23 in 29.93 in 29.58 in

Weekly Weather History Graph

Weekly Weather History Graph

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Astronomy

Feb. 20, 2013 Rise Set
Actual Time 7:22 AM MST 6:01 PM MST
Civil Twilight 6:52 AM MST 6:31 PM MST
Nautical Twilight 6:16 AM MST 7:07 PM MST
Astronomical Twilight 5:42 AM MST 7:42 PM MST
Moon 1:14 PM MST (2/20) 3:57 AM MST (2/20)
Length of Visible Light 11h 39m
Length of Day
10h 38m
Waxing Gibbous, 76% of the Moon is Illuminated
Feb 20
Waxing Gibbous
Feb 25
Full
Mar 4
Last Quarter
Mar 11
New
Mar 19
First Quarter

Daily Weather History & Observations

2013 Temp. (°F) Dew Point (°F) Humidity (%) Sea Level Press. (in) Visibility (mi) Wind (mph) Precip. (in) Events
Feb high avg low high avg low high avg low high avg low high avg low high avg high sum  
17 40 34 28 30 24 19 92 70 48 30.15 29.93 29.73 10 8 1 28 12 35 0.01 Snow
18 37 28 18 25 20 16 88 70 51 30.23 30.09 29.99 10 8 2 16 3 18 0.01 Snow
19 39 32 25 20 18 16 75 58 40 29.97 29.84 29.71 10 10 10 12 3 15 0.00  
20 36 29 21 26 20 13 92 73 53 30.01 29.91 29.80 10 8 1 14 4 18 0.02 Snow
21 36 27 18 16 12 9 73 53 32 30.10 30.03 29.86 10 10 10 23 9 29 0.00  
22 43 35 26 19 16 13 63 46 29 30.04 29.88 29.66 10 10 10 23 9 30 0.00  
23 40 34 28 28 17 8 78 55 32 30.19 29.84 29.58 10 9 1 29 13 41 0.01 Snow