Weather History for Helena, MT

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Month of December, 2013

  Max Avg Min Sum
Temperature  
Max Temperature 54 °F 33 °F -4 °F
Mean Temperature 45 °F 24 °F -10 °F
Min Temperature 38 °F 15 °F -17 °F
Degree Days  
Heating Degree Days (base 65) 75 41 20 1266
Cooling Degree Days (base 65) 0 0 0 0
Growing Degree Days (base 50) 0 0 0 0
Dew Point  
Dew Point 37 °F 13 °F -24 °F
Precipitation  
Precipitation 0.16 in 0.01 in 0.00 in 0.29 in
Snowdepth 1.0 in 0.2 in 0.0 in -
Wind  
Wind 36 mph 6 mph 0 mph
Gust Wind 51 mph 24 mph 16 mph
Sea Level Pressure  
Sea Level Pressure 30.71 in 30.23 in 29.52 in

Monthly Weather History Graph

Monthly Weather History Graph

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Date:

Astronomy

Dec. 01, 2013 Rise Set
Actual Time 7:51 AM MST 4:42 PM MST
Civil Twilight 7:17 AM MST 5:16 PM MST
Nautical Twilight 6:39 AM MST 5:54 PM MST
Astronomical Twilight 6:03 AM MST 6:30 PM MST
Moon 6:09 AM MST (12/1) 3:58 PM MST (12/1)
Length of Visible Light 9h 58m
Length of Day
8h 50m
Waning Crescent, 2% of the Moon is Illuminated
Dec 1
Waning Crescent
Dec 2
New
Dec 9
First Quarter
Dec 17
Full
Dec 25
Last Quarter

Weather History Calendar

Precipitation Actual month total 0.29 Normal Month Total: 0.40
Sunday Monday Tuesday Wednesday Thursday Friday Saturday
Rain
Actual:
48 | 36 T
Average:
35 | 16 0.02
Snow
Actual:
42 | 11 0.16
Average:
35 | 15 0.01
Snow
Actual:
11 | 2 T
Average:
34 | 15 0.02
Snow
Actual:
7 | -7 T
Average:
34 | 15 0.01
Partly Cloudy
Actual:
6 | -12 0.00
Average:
34 | 14 0.02
Partly Cloudy
Actual:
-3 | -11 0.00
Average:
33 | 14 0.01
Snow
Actual:
-4 | -17 T
Average:
33 | 13 0.01
Snow
Actual:
3 | -15 0.04
Average:
33 | 13 0.02
Mostly Cloudy
Actual:
25 | -11 0.00
Average:
32 | 13 0.01
Mostly Cloudy
Actual:
28 | 18 0.00
Average:
32 | 13 0.01
Partly Cloudy
Actual:
35 | 17 0.00
Average:
32 | 12 0.02
Partly Cloudy
Actual:
38 | 21 0.00
Average:
32 | 12 0.01
Partly Cloudy
Actual:
43 | 21 0.00
Average:
31 | 12 0.01
Partly Cloudy
Actual:
47 | 34 0.00
Average:
31 | 12 0.01
Scattered Clouds
Actual:
54 | 32 0.00
Average:
31 | 11 0.02
Scattered Clouds
Actual:
51 | 38 0.00
Average:
31 | 11 0.01
Clear
Actual:
52 | 27 0.00
Average:
31 | 11 0.01
Snow
Actual:
51 | 14 0.01
Average:
31 | 11 0.01
Snow
Actual:
14 | 4 T
Average:
31 | 11 0.01
Snow
Actual:
20 | 4 0.03
Average:
31 | 11 0.02
Snow
Actual:
33 | 19 T
Average:
31 | 11 0.01
Snow
Actual:
32 | 7 0.01
Average:
31 | 11 0.01
Rain
Actual:
39 | 13 0.03
Average:
31 | 11 0.01
Partly Cloudy
Actual:
39 | 30 0.00
Average:
31 | 10 0.01
Scattered Clouds
Actual:
39 | 14 0.00
Average:
31 | 10 0.02
Partly Cloudy
Actual:
50 | 38 0.00
Average:
31 | 11 0.01
Scattered Clouds
Actual:
50 | 30 0.00
Average:
31 | 11 0.01
Snow
Actual:
49 | 16 0.01
Average:
31 | 11 0.01
Partly Cloudy
Actual:
38 | 13 0.00
Average:
31 | 11 0.02
Partly Cloudy
Actual:
45 | 30 0.00
Average:
31 | 11 0.01
Overcast
Actual:
47 | 38 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

2013 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 48 42 36 37 32 27 82 66 49 30.14 29.89 29.69 10 10 10 24 6 33 T Rain
2 42 27 11 36 24 1 92 77 61 30.14 29.70 29.52 10 7 1 23 8 29 0.16 Rain , Snow
3 11 7 2 0 -2 -6 76 70 63 30.48 30.31 30.03 10 8 2 21 12 28 T Snow
4 7 0 -7 0 -6 -13 79 70 60 30.51 30.45 30.18 10 8 2 17 7 22 T Snow
5 6 -3 -12 -6 -12 -17 79 70 60 30.61 30.50 30.17 10 10 10 17 3 20 0.00  
6 -3 -7 -11 -15 -19 -22 72 59 45 30.71 30.64 30.32 10 10 7 13 9 16 0.00  
7 -4 -10 -17 -17 -21 -24 72 61 50 30.66 30.51 30.40 10 10 7 8 2 9 T Snow
8 3 -6 -15 -2 -11 -21 87 76 65 30.55 30.35 30.10 10 5 0 6 1 7 0.04 Snow
9 25 7 -11 12 2 -16 83 65 47 30.53 30.40 30.16 10 10 6 22 6 29 0.00  
10 28 23 18 15 14 11 74 62 50 30.41 30.30 30.18 10 10 9 24 8 30 0.00  
11 35 26 17 17 15 12 80 64 47 30.48 30.43 30.39 10 10 10 17 4 23 0.00  
12 38 30 21 21 18 16 84 66 48 30.42 30.27 30.14 10 10 10 8 3 10 0.00  
13 43 32 21 27 24 17 81 65 49 30.33 30.20 30.08 10 10 10 21 9 26 0.00  
14 47 41 34 28 25 23 64 55 45 30.36 30.29 30.19 10 10 10 25 11 35 0.00  
15 54 43 32 27 23 18 56 42 28 30.23 30.16 30.06 10 10 10 26 9 38 0.00  
16 51 45 38 25 21 18 49 40 31 30.34 30.25 30.11 10 10 10 20 8 33 0.00  
17 52 40 27 23 21 17 75 51 27 30.35 30.13 29.90 10 10 9 20 3 24 0.00  
18 51 33 14 25 18 6 75 51 26 30.04 29.84 29.74 10 8 1 25 10 32 0.01 Snow
19 14 9 4 3 -1 -4 83 67 51 30.39 30.23 29.93 10 8 2 20 6 24 T Snow
20 20 12 4 16 8 -1 86 74 62 30.19 29.87 29.53 10 7 1 8 2 9 0.03 Snow
21 33 26 19 23 18 16 91 73 54 30.07 29.92 29.54 10 9 2 24 6 30 T Snow
22 32 20 7 22 13 4 88 77 66 30.43 30.23 30.03 10 8 1 10 2 13 0.01 Snow
23 39 26 13 34 21 11 92 76 59 30.40 30.19 29.85 10 8 5 33 4 47 0.03 Rain
24 39 35 30 22 18 15 56 48 40 30.50 30.37 30.14 10 10 10 36 14 51 0.00  
25 39 27 14 18 14 10 74 57 40 30.58 30.47 30.35 10 10 10 17 5 22 0.00  
26 50 44 38 28 25 16 60 47 33 30.36 30.29 30.23 10 10 10 17 5 23 0.00  
27 50 40 30 27 24 18 75 55 34 30.30 30.15 29.95 10 10 10 12 5 15 0.00  
28 49 33 16 23 12 6 73 53 33 30.54 30.38 29.94 10 10 4 26 6 33 0.01 Snow
29 38 26 13 24 17 11 88 65 41 30.51 30.31 30.16 10 10 8 29 6 37 0.00  
30 45 38 30 29 24 23 75 58 41 30.25 30.16 30.02 10 10 10 21 7 28 0.00  
31 47 43 38 33 29 23 70 60 49 30.16 30.03 29.97 10 10 10 25 12 35 T