Weather History for Lewistown, MT

Change the Weather History Date:

Month of May, 2012

  Max Avg Min Sum
Temperature  
Max Temperature 81 °F 61 °F 37 °F
Mean Temperature 64 °F 48 °F 34 °F
Min Temperature 49 °F 34 °F 24 °F
Degree Days  
Heating Degree Days (base 65) 31 17 1 537
Cooling Degree Days (base 65) 0 0 0 0
Growing Degree Days (base 50) 14 2 0 73
Dew Point  
Dew Point 55 °F 33 °F 12 °F
Precipitation  
Precipitation 0.53 in 0.10 in 0.00 in 2.68 in
Snowdepth 0.0 in 0.0 in 0.0 in -
Wind  
Wind 35 mph 9 mph 0 mph
Gust Wind 45 mph 23 mph 16 mph
Sea Level Pressure  
Sea Level Pressure 30.36 in 29.95 in 29.57 in

Monthly Weather History Graph

Monthly Weather History Graph

Search for Another Location

Airport:

Trip Planner

Search our weather history database for the weather conditions in past years. The results will help you decide how hot, cold, wet, or windy it might be!

Date:

Astronomy

May. 16, 2012 Rise Set
Actual Time 5:40 AM MDT 8:48 PM MDT
Civil Twilight 5:04 AM MDT 9:25 PM MDT
Nautical Twilight 4:17 AM MDT 10:12 PM MDT
Astronomical Twilight 3:19 AM MDT 11:11 PM MDT
Moon 3:26 AM MDT (5/16) 4:55 PM MDT (5/16)
Length of Visible Light 16h 21m
Length of Day
15h 08m
Waning Crescent, 15% of the Moon is Illuminated
May 16
Waning Crescent
May 20
New
May 28
First Quarter
Jun 4
Full
Jun 11
Last Quarter

Weather History Calendar

Precipitation Actual month total 2.68 Normal Month Total: 2.85
Sunday Monday Tuesday Wednesday Thursday Friday Saturday
 
Partly Cloudy
Actual:
57 | 31 0.00
Average:
58 | 33 0.06
Partly Cloudy
Actual:
53 | 27 0.00
Average:
59 | 33 0.07
Partly Cloudy
Actual:
57 | 25 0.02
Average:
59 | 33 0.07
Rain
Actual:
63 | 35 0.16
Average:
59 | 34 0.07
Rain
Actual:
52 | 35 0.01
Average:
60 | 34 0.06
Partly Cloudy
Actual:
52 | 34 0.00
Average:
60 | 34 0.07
Clear
Actual:
59 | 27 0.00
Average:
60 | 35 0.08
Clear
Actual:
73 | 32 0.00
Average:
60 | 35 0.08
Scattered Clouds
Actual:
79 | 42 0.00
Average:
61 | 35 0.08
Snow
Actual:
54 | 28 0.41
Average:
61 | 36 0.08
Clear
Actual:
58 | 24 0.00
Average:
61 | 36 0.08
Clear
Actual:
68 | 28 0.00
Average:
62 | 36 0.09
Clear
Actual:
74 | 36 0.00
Average:
62 | 37 0.08
Clear
Actual:
73 | 39 0.00
Average:
62 | 37 0.09
Clear
Actual:
81 | 47 0.00
Average:
62 | 37 0.10
Clear
Actual:
80 | 45 T
Average:
63 | 38 0.09
Rain
Actual:
66 | 49 0.53
Average:
63 | 38 0.10
Rain
Actual:
54 | 34 0.03
Average:
63 | 38 0.10
Rain
Actual:
59 | 30 0.02
Average:
63 | 39 0.10
Scattered Clouds
Actual:
69 | 34 0.00
Average:
64 | 39 0.10
Rain
Actual:
78 | 44 0.14
Average:
64 | 39 0.10
Rain
Actual:
62 | 40 0.45
Average:
64 | 40 0.10
Partly Cloudy
Actual:
57 | 36 0.00
Average:
64 | 40 0.10
Mostly Cloudy
Actual:
49 | 33 T
Average:
65 | 40 0.11
Partly Cloudy
Actual:
48 | 27 0.01
Average:
65 | 40 0.11
Snow
Actual:
39 | 32 0.34
Average:
65 | 41 0.10
Snow
Actual:
37 | 31 0.45
Average:
65 | 41 0.11
Snow
Actual:
47 | 32 0.06
Average:
66 | 41 0.12
Rain
Actual:
63 | 31 0.05
Average:
66 | 42 0.11
Partly Cloudy
Actual:
61 | 35 0.00
Average:
66 | 42 0.12
Rain
Actual:
63 | 36 T
Average:
66 | 42 0.12
 

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
May high avg low high avg low high avg low high avg low high avg low high avg high sum  
1 57 44 31 37 27 20 82 54 26 29.73 29.63 29.58 10 10 10 35 14 45 0.00  
2 53 40 27 31 24 20 76 54 32 29.94 29.79 29.71 10 10 10 21 6 26 0.00  
3 57 41 25 41 28 16 96 61 26 29.97 29.86 29.79 10 10 10 17 7 21 0.02  
4 63 49 35 43 37 31 92 64 35 29.92 29.87 29.80 10 10 5 26 6 32 0.16 Rain
5 52 44 35 43 34 20 96 63 29 30.17 30.03 29.89 10 10 6 25 15 33 0.01 Rain
6 52 43 34 30 25 21 70 50 30 30.35 30.26 30.14 10 10 10 33 19 44 0.00  
7 59 43 27 32 27 22 85 57 28 30.36 30.30 30.22 10 10 10 16 6 23 0.00  
8 73 53 32 41 31 26 82 51 20 30.23 30.05 29.88 10 10 10 13 5 17 0.00  
9 79 61 42 44 33 27 70 43 15 29.88 29.76 29.62 10 10 10 26 8 32 0.00  
10 54 41 28 38 32 22 100 68 35 30.22 29.97 29.71 10 8 2 29 10 39 0.41 Rain , Snow
11 58 41 24 28 20 12 88 53 18 30.30 30.24 30.17 10 10 10 17 7 23 0.00  
12 68 48 28 34 25 15 78 47 15 30.30 30.24 30.18 10 10 10 9 4 13 0.00  
13 74 55 36 38 29 23 76 47 17 30.21 30.15 30.07 10 10 10 13 5 16 0.00  
14 73 56 39 38 32 27 70 46 22 30.16 30.14 30.09 10 10 10 16 8 22 0.00  
15 81 64 47 47 35 26 59 39 19 30.14 29.97 29.80 10 10 10 16 5 21 0.00  
16 80 63 45 47 38 31 71 44 17 29.80 29.74 29.66 10 10 10 24 5 35 T  
17 66 58 49 50 43 31 89 65 41 29.82 29.76 29.69 10 8 2 20 7 24 0.53 Rain
18 54 44 34 49 44 34 100 81 61 30.05 29.82 29.68 10 9 0 24 9 35 0.03 Fog , Rain
19 59 45 30 43 34 27 100 65 30 30.14 30.09 30.05 10 10 10 18 5 25 0.02 Rain
20 69 52 34 47 39 33 100 66 31 30.17 30.08 29.99 10 10 10 17 6 22 0.00  
21 78 61 44 55 47 39 93 61 28 30.01 29.91 29.71 10 9 2 28 8 35 0.14 Rain
22 62 51 40 52 43 31 93 66 38 29.69 29.62 29.57 10 9 4 29 11 33 0.45 Rain
23 57 47 36 37 32 29 85 62 38 29.71 29.65 29.59 10 10 10 24 12 35 0.00  
24 49 41 33 37 35 33 92 77 61 29.99 29.79 29.70 10 10 10 18 9 24 T  
25 48 38 27 38 31 25 92 69 45 30.06 30.03 29.97 10 10 10 20 10 30 0.01  
26 39 36 32 37 34 30 100 91 82 30.03 29.95 29.81 10 7 1 20 9 23 0.34 Rain , Snow
27 37 34 31 34 32 30 100 96 92 29.94 29.80 29.74 10 3 0 25 13 31 0.45 Fog , Rain , Snow
28 47 40 32 37 34 32 100 83 65 30.13 29.97 29.86 10 7 1 26 14 35 0.06 Snow
29 63 47 31 48 39 29 100 73 46 30.13 30.02 29.92 10 10 9 29 8 39 0.05 Rain
30 61 48 35 41 34 30 82 59 35 30.10 30.03 29.92 10 10 10 21 10 28 0.00  
31 63 50 36 48 40 33 92 67 42 30.13 30.03 29.91 10 10 10 16 6 21 T Rain