Weather History for Helena, MT

Change the Weather History Date:

Month of May, 2011

  Max Avg Min Sum
Temperature  
Max Temperature 74 °F 61 °F 45 °F
Mean Temperature 59 °F 51 °F 43 °F
Min Temperature 48 °F 40 °F 27 °F
Degree Days  
Heating Degree Days (base 65) 22 14 6 436
Cooling Degree Days (base 65) 0 0 0 0
Growing Degree Days (base 50) 8 2 0 59
Dew Point  
Dew Point 50 °F 34 °F 11 °F
Precipitation  
Precipitation 0.67 in 0.10 in 0.00 in 2.81 in
Snowdepth 0.0 in 0.0 in 0.0 in -
Wind  
Wind 36 mph 9 mph 0 mph
Gust Wind 49 mph 23 mph 16 mph
Sea Level Pressure  
Sea Level Pressure 30.38 in 29.94 in 29.55 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. 25, 2011 Rise Set
Actual Time 5:43 AM MDT 9:06 PM MDT
Civil Twilight 5:06 AM MDT 9:43 PM MDT
Nautical Twilight 4:17 AM MDT 10:32 PM MDT
Astronomical Twilight 3:15 AM MDT 11:36 PM MDT
Moon 2:09 AM MDT (5/25) 2:11 PM MDT (5/25)
Length of Visible Light 16h 37m
Length of Day
15h 23m
Last Quarter, 41% of the Moon is Illuminated
May 25
Last Quarter
Jun 1
New
Jun 8
First Quarter
Jun 15
Full
Jun 23
Last Quarter

Weather History Calendar

Precipitation Actual month total 2.81 Normal Month Total: 1.78
Sunday Monday Tuesday Wednesday Thursday Friday Saturday
Partly Cloudy
Actual:
54 | 35 T
Average:
62 | 36 0.04
Scattered Clouds
Actual:
68 | 27 0.00
Average:
62 | 36 0.05
Partly Cloudy
Actual:
54 | 38 0.00
Average:
62 | 36 0.05
Scattered Clouds
Actual:
58 | 36 0.00
Average:
62 | 36 0.05
Scattered Clouds
Actual:
70 | 35 0.00
Average:
63 | 37 0.05
Partly Cloudy
Actual:
61 | 45 0.00
Average:
63 | 37 0.05
Rain
Actual:
64 | 42 0.10
Average:
63 | 37 0.05
Rain
Actual:
55 | 41 0.06
Average:
64 | 38 0.05
Rain
Actual:
45 | 41 0.67
Average:
64 | 38 0.05
Partly Cloudy
Actual:
61 | 40 0.00
Average:
64 | 38 0.05
Clear
Actual:
68 | 33 0.00
Average:
65 | 38 0.06
Rain
Actual:
74 | 36 T
Average:
65 | 39 0.06
Scattered Clouds
Actual:
72 | 46 0.00
Average:
65 | 39 0.06
Partly Cloudy
Actual:
61 | 42 0.00
Average:
65 | 39 0.06
Scattered Clouds
Actual:
70 | 37 T
Average:
66 | 40 0.06
Rain
Actual:
61 | 45 0.00
Average:
66 | 40 0.06
Partly Cloudy
Actual:
63 | 41 0.00
Average:
66 | 40 0.06
Partly Cloudy
Actual:
66 | 39 0.00
Average:
66 | 40 0.06
Partly Cloudy
Actual:
65 | 39 0.00
Average:
67 | 41 0.06
Rain
Actual:
54 | 47 0.16
Average:
67 | 41 0.06
Partly Cloudy
Actual:
62 | 45 0.00
Average:
67 | 41 0.06
Rain
Actual:
72 | 40 0.17
Average:
68 | 41 0.06
Rain
Actual:
68 | 48 0.25
Average:
68 | 42 0.06
Rain
Actual:
53 | 43 0.53
Average:
68 | 42 0.06
Rain
Actual:
65 | 44 T
Average:
69 | 42 0.06
Rain
Actual:
56 | 43 0.03
Average:
69 | 43 0.06
Partly Cloudy
Actual:
59 | 42 0.02
Average:
69 | 43 0.06
Partly Cloudy
Actual:
58 | 40 0.00
Average:
69 | 43 0.06
Rain
Actual:
50 | 38 0.29
Average:
70 | 43 0.07
Rain
Actual:
50 | 39 0.43
Average:
70 | 44 0.07
Rain
Actual:
65 | 34 0.10
Average:
70 | 44 0.07
 

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
May high avg low high avg low high avg low high avg low high avg low high avg high sum  
1 54 45 35 27 24 20 70 49 28 30.34 30.29 30.21 10 10 10 25 10 33 T  
2 68 48 27 28 23 11 85 49 12 30.37 30.18 29.94 10 10 10 15 5 22 0.00  
3 54 46 38 34 22 16 76 49 22 30.28 30.14 29.94 10 10 10 36 18 46 0.00  
4 58 47 36 26 23 20 59 42 24 30.38 30.31 30.26 10 10 10 24 13 36 0.00  
5 70 53 35 34 26 21 70 44 18 30.26 30.03 29.83 10 10 10 32 7 40 0.00  
6 61 53 45 34 31 25 58 42 25 29.94 29.87 29.80 10 10 10 26 8 32 0.00  
7 64 53 42 41 36 32 96 64 32 29.80 29.73 29.66 10 10 6 21 6 29 0.10 Rain
8 55 48 41 42 37 33 89 68 46 29.74 29.71 29.67 10 10 9 21 7 23 0.06 Rain
9 45 43 41 43 39 36 92 86 79 29.98 29.85 29.73 10 8 4 18 10 25 0.67 Rain
10 61 51 40 39 33 27 89 58 27 29.97 29.94 29.89 10 10 10 16 7 25 0.00  
11 68 51 33 37 29 17 89 52 15 30.03 29.97 29.92 10 10 10 14 5 22 0.00  
12 74 55 36 45 34 28 79 51 23 30.16 30.07 30.00 10 10 10 14 4 17 T Rain
13 72 59 46 44 42 40 82 57 31 30.28 30.22 30.17 10 10 10 16 9 22 0.00  
14 61 52 42 40 34 29 83 58 33 30.28 30.20 30.10 10 10 10 25 10 31 0.00  
15 70 54 37 36 33 29 76 51 26 30.06 29.79 29.56 10 10 10 31 12 38 T  
16 61 53 45 46 26 12 74 45 15 29.78 29.69 29.58 10 10 10 26 11 49 0.00 Rain
17 63 52 41 30 26 22 62 42 22 29.79 29.74 29.68 10 10 10 14 4 20 0.00  
18 66 53 39 32 28 21 70 44 18 29.87 29.77 29.72 10 10 10 25 9 31 0.00  
19 65 52 39 39 34 30 76 54 31 30.04 29.98 29.88 10 10 10 23 10 28 0.00  
20 54 51 47 47 45 39 93 78 63 30.08 30.05 30.02 10 10 4 17 11 22 0.16 Rain
21 62 54 45 45 43 42 80 64 48 30.04 29.97 29.89 10 10 10 13 5 16 0.00  
22 72 56 40 50 43 39 96 65 34 29.92 29.86 29.78 10 10 6 24 5 30 0.17 Rain
23 68 58 48 49 45 43 93 68 42 29.91 29.83 29.73 10 10 4 17 4 20 0.25 Rain
24 53 48 43 48 42 37 92 85 77 30.17 29.93 29.76 10 9 5 20 9 22 0.53 Rain
25 65 55 44 45 43 41 92 70 48 30.18 30.02 29.72 10 10 10 17 5 21 T Rain
26 56 50 43 46 33 18 83 55 26 29.88 29.73 29.55 10 10 9 32 12 41 0.03 Rain
27 59 51 42 34 28 21 65 48 30 29.85 29.79 29.72 10 10 10 30 13 39 0.02  
28 58 49 40 35 29 25 76 53 30 29.85 29.80 29.73 10 10 10 21 10 25 0.00  
29 50 44 38 41 37 33 93 75 56 29.82 29.78 29.71 10 10 5 25 11 35 0.29 Rain
30 50 45 39 40 38 37 100 83 66 30.09 29.86 29.72 10 9 5 20 10 24 0.43 Rain
31 65 50 34 48 39 33 93 65 36 30.21 30.11 29.99 10 10 10 23 6 28 0.10 Rain