Weather History for Helena, MT

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Month of December, 2011

  Max Avg Min Sum
Temperature  
Max Temperature 53 °F 36 °F 20 °F
Mean Temperature 42 °F 26 °F 7 °F
Min Temperature 31 °F 16 °F -7 °F
Degree Days  
Heating Degree Days (base 65) 58 39 23 1202
Cooling Degree Days (base 65) 0 0 0 0
Growing Degree Days (base 50) 0 0 0 0
Dew Point  
Dew Point 37 °F 17 °F -9 °F
Precipitation  
Precipitation 0.02 in 0.00 in 0.00 in 0.07 in
Snowdepth 1.0 in 0.4 in 0.0 in -
Wind  
Wind 45 mph 6 mph 0 mph
Gust Wind 62 mph 24 mph 16 mph
Sea Level Pressure  
Sea Level Pressure 30.83 in 30.26 in 29.49 in

Monthly Weather History Graph

Monthly Weather History Graph

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Date:

Astronomy

Dec. 16, 2011 Rise Set
Actual Time 8:06 AM MST 4:41 PM MST
Civil Twilight 7:30 AM MST 5:16 PM MST
Nautical Twilight 6:52 AM MST 5:54 PM MST
Astronomical Twilight 6:15 AM MST 6:31 PM MST
Moon 11:40 PM MST (12/16) 11:34 AM MST (12/16)
Length of Visible Light 9h 45m
Length of Day
8h 34m
Waning Gibbous, 64% of the Moon is Illuminated
Dec 16
Waning Gibbous
Dec 17
Last Quarter
Dec 24
New
Dec 31
First Quarter
Jan 9
Full

Weather History Calendar

Precipitation Actual month total 0.07 Normal Month Total: 0.40
Sunday Monday Tuesday Wednesday Thursday Friday Saturday
 
Scattered Clouds
Actual:
29 | 8 0.00
Average:
35 | 16 0.02
Snow
Actual:
36 | 17 T
Average:
35 | 15 0.01
Snow
Actual:
30 | 10 0.01
Average:
34 | 15 0.02
Snow
Actual:
27 | 0 0.02
Average:
34 | 15 0.01
Clear
Actual:
20 | -7 0.00
Average:
34 | 14 0.02
Clear
Actual:
34 | 8 0.00
Average:
33 | 14 0.01
Snow
Actual:
31 | 13 T
Average:
33 | 13 0.01
Partly Cloudy
Actual:
24 | 5 0.00
Average:
33 | 13 0.02
Clear
Actual:
36 | 8 0.00
Average:
32 | 13 0.01
Clear
Actual:
34 | 7 0.00
Average:
32 | 13 0.01
Clear
Actual:
27 | 8 0.00
Average:
32 | 12 0.02
Snow
Actual:
28 | 12 T
Average:
32 | 12 0.01
Partly Cloudy
Actual:
29 | 6 0.00
Average:
31 | 12 0.01
Overcast
Actual:
38 | 24 T
Average:
31 | 12 0.01
Partly Cloudy
Actual:
36 | 25 0.00
Average:
31 | 11 0.02
Partly Cloudy
Actual:
43 | 31 0.00
Average:
31 | 11 0.01
Scattered Clouds
Actual:
50 | 28 0.00
Average:
31 | 11 0.01
Snow
Actual:
38 | 21 T
Average:
31 | 11 0.01
Scattered Clouds
Actual:
38 | 18 0.00
Average:
31 | 11 0.01
Scattered Clouds
Actual:
42 | 22 0.00
Average:
31 | 11 0.02
Snow
Actual:
37 | 13 0.02
Average:
31 | 11 0.01
Scattered Clouds
Actual:
27 | 5 0.00
Average:
31 | 11 0.01
Clear
Actual:
37 | 8 0.00
Average:
31 | 11 0.01
Partly Cloudy
Actual:
43 | 21 0.00
Average:
31 | 10 0.01
Scattered Clouds
Actual:
44 | 22 0.00
Average:
31 | 10 0.02
Scattered Clouds
Actual:
40 | 20 T
Average:
31 | 11 0.01
Mostly Cloudy
Actual:
45 | 20 0.00
Average:
31 | 11 0.01
Partly Cloudy
Actual:
53 | 31 T
Average:
31 | 11 0.01
Rain
Actual:
50 | 29 T
Average:
31 | 11 0.02
Rain
Actual:
47 | 29 0.02
Average:
31 | 11 0.01
Partly Cloudy
Actual:
36 | 22 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

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  
1 29 19 8 18 13 9 88 73 57 30.83 30.61 30.15 10 10 10 12 2 13 0.00  
2 36 27 17 27 21 15 88 70 52 30.40 30.15 29.89 10 8 0 17 6 22 T Fog , Snow
3 30 20 10 24 15 9 100 75 50 30.41 30.28 30.12 10 7 0 22 7 28 0.01 Fog , Snow
4 27 14 0 25 14 -3 91 72 52 30.75 30.50 30.14 10 7 1 23 8 28 0.02 Snow
5 20 7 -7 6 0 -9 91 70 49 30.72 30.57 30.27 10 10 4 9 2 12 0.00  
6 34 21 8 17 11 4 83 67 50 30.48 30.42 30.36 10 10 10 12 3 15 0.00  
7 31 22 13 21 16 10 88 76 63 30.43 30.34 30.13 10 10 5 13 4 15 T Snow
8 24 15 5 16 12 4 92 80 68 30.44 30.39 30.20 10 10 8 9 2 12 0.00  
9 36 22 8 18 13 8 96 70 44 30.53 30.48 30.27 10 9 5 8 1 10 0.00  
10 34 21 7 18 13 6 92 72 51 30.48 30.29 29.99 10 10 7 8 1 8 0.00  
11 27 18 8 17 13 7 92 80 68 30.19 30.13 29.93 10 9 7 9 3 10 0.00  
12 28 20 12 20 17 10 88 76 63 30.27 30.18 30.01 10 10 3 9 4 12 T Snow
13 29 18 6 17 12 4 92 80 68 30.19 30.12 30.01 10 10 8 9 2 10 0.00  
14 38 31 24 26 22 16 85 66 47 30.21 30.12 29.84 10 10 10 18 4 24 T  
15 36 31 25 25 22 19 92 74 56 30.42 30.23 30.02 10 10 9 18 4 23 0.00  
16 43 37 31 27 22 18 59 53 46 30.45 30.41 30.29 10 10 10 28 10 33 0.00  
17 50 39 28 28 26 21 85 64 42 30.43 30.33 30.17 10 10 10 15 5 18 0.00  
18 38 30 21 28 23 19 85 70 54 30.31 30.13 29.95 10 10 6 15 5 17 T Snow
19 38 28 18 23 19 13 92 68 43 30.41 30.33 30.21 10 10 10 14 4 20 0.00  
20 42 32 22 24 19 12 63 50 37 30.22 30.05 29.89 10 10 10 32 11 44 0.00  
21 37 25 13 28 22 10 88 68 48 30.57 30.18 29.85 10 6 1 22 9 29 0.02 Snow
22 27 16 5 13 9 4 91 73 55 30.64 30.57 30.32 10 10 10 12 2 13 0.00  
23 37 23 8 15 10 5 91 63 35 30.65 30.59 30.42 10 10 9 17 3 21 0.00  
24 43 32 21 27 21 14 74 59 43 30.63 30.59 30.44 10 10 10 21 4 26 0.00  
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