Weather History for Lewistown, MT

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Month of December, 2013

  Max Avg Min Sum
Temperature  
Max Temperature 49 °F 30 °F -10 °F
Mean Temperature 43 °F 19 °F -16 °F
Min Temperature 36 °F 8 °F -29 °F
Degree Days  
Heating Degree Days (base 65) 81 46 22 1413
Cooling Degree Days (base 65) 0 0 0 0
Growing Degree Days (base 50) 0 0 0 0
Dew Point  
Dew Point 35 °F 13 °F -38 °F
Precipitation  
Precipitation 0.20 in 0.03 in 0.00 in 0.66 in
Snowdepth 8.0 in 2.8 in 0.0 in -
Wind  
Wind 33 mph 11 mph 0 mph
Gust Wind 46 mph 26 mph 16 mph
Sea Level Pressure  
Sea Level Pressure 30.75 in 30.07 in 29.47 in

Monthly Weather History Graph

Monthly Weather History Graph

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Date:

Astronomy

Dec. 20, 2013 Rise Set
Actual Time 8:00 AM MST 4:30 PM MST
Civil Twilight 7:25 AM MST 5:06 PM MST
Nautical Twilight 6:46 AM MST 5:45 PM MST
Astronomical Twilight 6:08 AM MST 6:22 PM MST
Moon 8:06 PM MST (12/20) 9:45 AM MST (12/20)
Length of Visible Light 9h 41m
Length of Day
8h 30m
Waning Gibbous, 90% of the Moon is Illuminated
Dec 20
Waning Gibbous
Dec 25
Last Quarter
Jan 1
New
Jan 7
First Quarter
Jan 15
Full

Weather History Calendar

Precipitation Actual month total 0.66 Normal Month Total: 0.66
Sunday Monday Tuesday Wednesday Thursday Friday Saturday
Rain
Actual:
47 | 33 0.03
Average:
37 | 15 0.02
Snow
Actual:
47 | 11 0.20
Average:
36 | 15 0.02
Snow
Actual:
11 | 1 0.05
Average:
36 | 15 0.03
Snow
Actual:
8 | -17 0.01
Average:
36 | 14 0.02
Snow
Actual:
1 | -22 T
Average:
35 | 14 0.02
Scattered Clouds
Actual:
-10 | -23 0.00
Average:
35 | 14 0.02
Clear
Actual:
-2 | -29 0.00
Average:
35 | 14 0.02
Snow
Actual:
15 | -20 T
Average:
35 | 13 0.02
Partly Cloudy
Actual:
28 | -8 0.00
Average:
34 | 13 0.02
Snow
Actual:
31 | -3 0.01
Average:
34 | 13 0.02
Scattered Clouds
Actual:
33 | -4 0.00
Average:
34 | 13 0.02
Clear
Actual:
41 | 35 0.00
Average:
34 | 13 0.02
Partly Cloudy
Actual:
36 | 20 0.00
Average:
34 | 12 0.02
Scattered Clouds
Actual:
40 | 27 0.00
Average:
34 | 12 0.02
Scattered Clouds
Actual:
43 | 34 0.00
Average:
34 | 12 0.02
Scattered Clouds
Actual:
41 | 21 0.00
Average:
34 | 12 0.02
Clear
Actual:
49 | 19 0.00
Average:
33 | 12 0.02
Snow
Actual:
47 | 7 0.08
Average:
33 | 12 0.03
Snow
Actual:
7 | -8 0.01
Average:
33 | 12 0.02
Snow
Actual:
25 | 1 0.01
Average:
33 | 12 0.02
Snow
Actual:
24 | 11 0.08
Average:
33 | 12 0.02
Snow
Actual:
11 | -4 0.05
Average:
33 | 12 0.02
Rain
Actual:
42 | 1 0.03
Average:
33 | 12 0.02
Snow
Actual:
37 | 19 0.03
Average:
33 | 12 0.03
Clear
Actual:
42 | 12 0.00
Average:
33 | 12 0.02
Clear
Actual:
43 | 29 0.00
Average:
33 | 12 0.02
Clear
Actual:
49 | 36 0.00
Average:
33 | 12 0.02
Snow
Actual:
42 | 3 T
Average:
33 | 12 0.02
Snow
Actual:
36 | 12 T
Average:
33 | 12 0.02
Partly Cloudy
Actual:
40 | 26 T
Average:
33 | 12 0.03
Snow
Actual:
40 | 25 0.07
Average:
33 | 12 0.02
 

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 47 40 33 34 30 26 75 60 45 30.04 29.78 29.58 10 10 5 25 15 30 0.03 Rain
2 47 29 11 35 24 3 100 77 53 29.99 29.63 29.49 10 7 1 32 13 46 0.20 Rain , Snow
3 11 6 1 4 0 -6 88 79 69 30.37 30.13 29.85 7 2 0 24 15 29 0.05 Snow
4 8 -4 -17 -5 -8 -22 91 74 57 30.43 30.21 30.09 10 4 1 17 9 24 0.01 Snow
5 1 -10 -22 -9 -16 -27 100 79 58 30.56 30.39 30.10 10 9 3 13 5 15 T Snow
6 -10 -16 -23 -20 -27 -35 69 53 36 30.75 30.58 30.28 10 10 6 14 8 16 0.00  
7 -2 -15 -29 -18 -27 -38 86 68 50 30.62 30.46 30.21 10 10 10 9 4 9 0.00  
8 15 -2 -20 4 -3 -24 86 66 45 30.27 30.07 29.88 10 5 0 22 10 29 T Snow
9 28 10 -8 14 5 -12 82 62 42 30.13 30.04 29.96 10 10 6 29 16 38 0.00  
10 31 14 -3 22 14 -5 91 71 50 30.38 30.08 29.80 10 4 0 26 12 33 0.01 Snow
11 33 15 -4 23 12 -6 88 68 47 30.34 30.24 30.14 10 10 5 26 15 32 0.00  
12 41 38 35 26 23 20 69 62 54 30.14 29.99 29.84 10 10 10 22 14 - 0.00  
13 36 28 20 26 22 17 84 70 56 30.22 30.05 29.85 10 10 9 18 6 20 0.00  
14 40 34 27 29 25 20 78 71 64 30.20 30.10 29.95 10 10 10 24 17 30 0.00  
15 43 39 34 28 26 23 70 62 53 29.99 29.95 29.92 10 10 10 32 21 37 0.00  
16 41 31 21 28 24 18 84 68 51 30.28 30.11 30.00 10 10 10 23 10 29 0.00  
17 49 34 19 26 23 16 84 60 36 30.26 29.98 29.74 10 10 10 33 14 42 0.00  
18 47 27 7 27 22 5 100 69 37 30.04 29.80 29.69 10 6 1 22 9 26 0.08 Snow
19 7 0 -8 4 -4 -11 95 84 72 30.33 30.10 29.92 10 5 1 18 7 24 0.01 Snow
20 25 13 1 20 10 -2 87 73 59 30.01 29.75 29.47 10 9 1 17 7 20 0.01 Snow
21 24 18 11 23 17 9 100 92 84 30.11 29.74 29.47 10 4 1 14 6 18 0.08 Snow
22 11 4 -4 8 3 -5 92 86 79 30.42 30.16 29.93 10 4 1 14 8 16 0.05 Snow
23 42 22 1 32 22 -2 95 80 65 30.35 30.06 29.83 10 10 10 26 13 40 0.03 Rain
24 37 28 19 32 27 14 100 79 58 30.39 30.09 29.88 10 8 1 29 16 40 0.03 Snow
25 42 27 12 23 16 9 88 66 43 30.43 30.26 30.11 10 10 10 31 11 37 0.00  
26 43 36 29 31 27 18 70 61 52 30.19 30.10 30.01 10 10 10 22 13 28 0.00  
27 49 43 36 30 26 21 70 56 42 30.09 29.97 29.80 10 10 10 21 13 24 0.00  
28 42 23 3 26 8 0 100 70 40 30.48 30.27 29.81 10 8 1 31 10 41 T Snow
29 36 24 12 25 17 9 96 76 56 30.45 30.13 29.91 10 10 6 24 12 38 T Snow
30 40 33 26 29 25 21 92 76 59 30.20 30.05 29.84 10 10 10 25 10 31 T  
31 40 33 25 32 28 24 100 82 64 30.11 29.93 29.84 10 7 1 23 7 31 0.07 Rain , Snow