Weather History for Helena, MT

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Month of December, 2012

  Max Avg Min Sum
Temperature  
Max Temperature 56 °F 33 °F 12 °F
Mean Temperature 44 °F 25 °F 7 °F
Min Temperature 34 °F 16 °F -4 °F
Degree Days  
Heating Degree Days (base 65) 58 40 21 1243
Cooling Degree Days (base 65) 0 0 0 0
Growing Degree Days (base 50) 0 0 0 0
Dew Point  
Dew Point 37 °F 15 °F -8 °F
Precipitation  
Precipitation 0.35 in 0.04 in 0.00 in 0.87 in
Snowdepth 4.0 in 1.8 in 0.0 in -
Wind  
Wind 35 mph 6 mph 0 mph
Gust Wind 45 mph 25 mph 16 mph
Sea Level Pressure  
Sea Level Pressure 30.60 in 30.00 in 29.24 in

Monthly Weather History Graph

Monthly Weather History Graph

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Date:

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

Weather History Calendar

Precipitation Actual month total 0.87 Normal Month Total: 0.40
Sunday Monday Tuesday Wednesday Thursday Friday Saturday
 
Rain
Actual:
55 | 29 0.02
Average:
35 | 16 0.02
Rain
Actual:
56 | 32 0.06
Average:
35 | 15 0.01
Scattered Clouds
Actual:
46 | 34 0.00
Average:
34 | 15 0.02
Partly Cloudy
Actual:
51 | 32 0.00
Average:
34 | 15 0.01
Rain
Actual:
55 | 29 T
Average:
34 | 14 0.02
Snow
Actual:
36 | 27 T
Average:
33 | 14 0.01
Snow
Actual:
38 | 22 0.05
Average:
33 | 13 0.01
Snow
Actual:
31 | 5 0.33
Average:
33 | 13 0.02
Fog
Actual:
27 | -4 0.00
Average:
32 | 13 0.01
Snow
Actual:
34 | 26 T
Average:
32 | 13 0.01
Partly Cloudy
Actual:
44 | 30 0.00
Average:
32 | 12 0.02
Snow
Actual:
38 | 28 0.01
Average:
32 | 12 0.01
Scattered Clouds
Actual:
35 | 20 T
Average:
31 | 12 0.01
Fog
Actual:
22 | 13 0.00
Average:
31 | 12 0.01
Fog
Actual:
28 | 13 0.00
Average:
31 | 11 0.02
Partly Cloudy
Actual:
34 | 14 0.00
Average:
31 | 11 0.01
Snow
Actual:
43 | 24 0.01
Average:
31 | 11 0.01
Scattered Clouds
Actual:
29 | 16 0.00
Average:
31 | 11 0.01
Scattered Clouds
Actual:
25 | 4 0.00
Average:
31 | 11 0.01
Clear
Actual:
38 | 12 0.00
Average:
31 | 11 0.02
Partly Cloudy
Actual:
36 | 19 0.00
Average:
31 | 11 0.01
Partly Cloudy
Actual:
28 | 15 0.00
Average:
31 | 11 0.01
Snow
Actual:
29 | 10 T
Average:
31 | 11 0.01
Snow
Actual:
16 | 2 0.35
Average:
31 | 10 0.01
Snow
Actual:
12 | 2 T
Average:
31 | 10 0.02
Snow
Actual:
18 | 7 0.03
Average:
31 | 11 0.01
Fog
Actual:
21 | 8 0.00
Average:
31 | 11 0.01
Partly Cloudy
Actual:
34 | 10 0.00
Average:
31 | 11 0.01
Scattered Clouds
Actual:
24 | 8 0.00
Average:
31 | 11 0.02
Snow
Actual:
26 | 7 0.01
Average:
31 | 11 0.01
Snow
Actual:
23 | 3 T
Average:
31 | 11 0.01
 

Calendar Legend

Sunny
Clear
Mostly Cloudy
Partly Sunny
Partly Cloudy
Mostly Sunny
Cloudy Rain Snow
Hail
Flurries
Thunderstorms Hazy
Fog
Sleet '?' denotes
'chance of'
Unknown

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  
1 55 42 29 37 32 28 92 65 38 29.84 29.78 29.65 10 10 5 35 4 45 0.02 Rain
2 56 44 32 37 30 18 85 63 41 29.83 29.50 29.24 10 9 3 31 11 41 0.06 Rain
3 46 40 34 22 20 18 61 47 33 30.20 30.06 29.84 10 10 10 28 11 37 0.00  
4 51 42 32 33 26 19 61 50 39 30.17 30.01 29.89 10 10 10 25 9 33 0.00  
5 55 42 29 37 26 16 56 45 34 30.13 29.90 29.74 10 10 10 30 12 44 T Rain
6 36 32 27 24 20 17 78 63 47 30.16 30.08 29.89 10 10 10 12 5 15 T Snow
7 38 30 22 28 20 11 85 59 32 30.04 29.86 29.61 10 8 1 26 9 36 0.05 Snow
8 31 18 5 21 14 3 91 71 50 30.43 30.01 29.62 10 5 0 33 10 43 0.33 Fog , Snow
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
16 34 24 14 17 12 7 88 62 36 29.85 29.77 29.58 10 10 10 23 7 29 0.00  
17 43 34 24 28 20 10 88 62 36 29.70 29.50 29.32 10 9 1 29 9 37 0.01 Snow
18 29 23 16 10 8 6 59 49 39 30.05 29.88 29.63 10 10 10 24 10 32 0.00  
19 25 15 4 8 4 2 73 62 50 30.27 30.19 30.06 10 10 10 9 3 10 0.00  
20 38 25 12 13 8 3 70 51 32 30.27 30.18 29.94 10 10 10 18 4 22 0.00  
21 36 28 19 19 13 10 69 54 38 30.15 30.08 30.03 10 10 10 12 4 13 0.00  
22 28 22 15 15 12 8 80 71 62 30.12 30.03 29.93 10 9 7 10 3 12 0.00  
23 29 20 10 16 12 8 92 75 58 30.17 30.03 29.75 10 7 2 15 3 17 T Snow
24 16 9 2 12 0 -7 88 75 62 30.53 30.12 29.77 10 4 0 16 9 20 0.35 Fog , Snow
25 12 7 2 2 -1 -3 86 78 69 30.52 30.32 30.13 10 8 1 5 0 6 T Snow
26 18 13 7 12 8 2 83 78 73 30.11 29.95 29.76 9 5 2 3 0 5 0.03 Snow
27 21 15 8 14 10 5 92 83 73 30.15 30.04 29.86 10 4 0 6 1 7 0.00 Fog
28 34 22 10 19 14 8 96 71 45 30.27 30.18 29.94 10 9 5 20 5 24 0.00  
29 24 16 8 12 9 7 84 72 59 30.30 30.24 30.19 10 10 10 9 2 10 0.00  
30 26 17 7 12 9 5 92 74 55 30.34 30.28 30.22 10 9 4 18 3 23 0.01 Snow
31 23 13 3 13 8 0 92 77 62 30.41 30.30 30.09 10 8 0 8 2 10 T Fog , Snow