Weather History for Helena, MT

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Month of May, 2012

  Max Avg Min Sum
Temperature  
Max Temperature 87 °F 65 °F 42 °F
Mean Temperature 68 °F 52 °F 37 °F
Min Temperature 52 °F 38 °F 27 °F
Degree Days  
Heating Degree Days (base 65) 28 13 0 411
Cooling Degree Days (base 65) 3 0 0 4
Growing Degree Days (base 50) 18 4 0 127
Dew Point  
Dew Point 56 °F 29 °F 3 °F
Precipitation  
Precipitation 0.76 in 0.05 in 0.00 in 1.35 in
Snowdepth 0.0 in 0.0 in 0.0 in -
Wind  
Wind 33 mph 8 mph 0 mph
Gust Wind 44 mph 23 mph 16 mph
Sea Level Pressure  
Sea Level Pressure 30.46 in 30.01 in 29.68 in

Monthly Weather History Graph

Monthly Weather History Graph

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Date:

Astronomy

May. 28, 2012 Rise Set
Actual Time 5:40 AM MDT 9:10 PM MDT
Civil Twilight 5:03 AM MDT 9:48 PM MDT
Nautical Twilight 4:13 AM MDT 10:38 PM MDT
Astronomical Twilight 3:07 AM MDT 11:44 PM MDT
Moon 1:13 PM MDT (5/28) 1:32 AM MDT (5/28)
Length of Visible Light 16h 45m
Length of Day
15h 29m
Waxing Crescent, 49% of the Moon is Illuminated
May 28
Waxing Crescent
May 28
First Quarter
Jun 4
Full
Jun 11
Last Quarter
Jun 19
New

Weather History Calendar

Precipitation Actual month total 1.35 Normal Month Total: 1.87
Sunday Monday Tuesday Wednesday Thursday Friday Saturday
 
Scattered Clouds
Actual:
56 | 38 0.00
Average:
63 | 36 0.04
Partly Cloudy
Actual:
54 | 27 0.00
Average:
63 | 37 0.04
Rain
Actual:
56 | 27 T
Average:
63 | 37 0.04
Rain
Actual:
65 | 35 0.12
Average:
64 | 37 0.04
Partly Cloudy
Actual:
54 | 38 0.00
Average:
64 | 37 0.04
Partly Cloudy
Actual:
57 | 38 T
Average:
64 | 38 0.04
Clear
Actual:
67 | 28 0.00
Average:
65 | 38 0.05
Clear
Actual:
78 | 35 0.00
Average:
65 | 38 0.05
Clear
Actual:
82 | 44 0.00
Average:
65 | 39 0.05
Partly Cloudy
Actual:
56 | 33 0.00
Average:
66 | 39 0.06
Clear
Actual:
62 | 27 0.00
Average:
66 | 39 0.05
Clear
Actual:
71 | 31 0.00
Average:
66 | 40 0.05
Clear
Actual:
82 | 38 0.00
Average:
66 | 40 0.06
Clear
Actual:
82 | 42 0.00
Average:
67 | 40 0.06
Clear
Actual:
87 | 45 0.00
Average:
67 | 41 0.06
Clear
Actual:
85 | 51 0.00
Average:
67 | 41 0.06
Thunderstorm
Actual:
69 | 52 0.01
Average:
68 | 41 0.07
Partly Cloudy
Actual:
65 | 40 0.00
Average:
68 | 42 0.06
Scattered Clouds
Actual:
66 | 33 0.00
Average:
68 | 42 0.06
Scattered Clouds
Actual:
75 | 38 0.00
Average:
68 | 42 0.07
Thunderstorm
Actual:
77 | 50 0.17
Average:
69 | 42 0.07
Rain
Actual:
62 | 46 0.05
Average:
69 | 43 0.07
Rain
Actual:
58 | 43 T
Average:
69 | 43 0.07
Rain
Actual:
56 | 42 T
Average:
69 | 43 0.07
Rain
Actual:
47 | 40 T
Average:
70 | 44 0.07
Rain
Actual:
44 | 36 0.18
Average:
70 | 44 0.08
Snow
Actual:
42 | 32 0.76
Average:
70 | 44 0.07
Rain
Actual:
60 | 35 0.04
Average:
70 | 44 0.08
Thunderstorm
Actual:
68 | 39 0.02
Average:
71 | 45 0.08
Partly Cloudy
Actual:
60 | 47 0.00
Average:
71 | 45 0.08
Rain
Actual:
65 | 40 T
Average:
71 | 45 0.08
 

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 56 47 38 32 24 17 62 43 24 29.82 29.75 29.68 10 10 10 29 14 37 0.00  
2 54 41 27 30 23 18 75 51 26 30.01 29.89 29.80 10 10 10 32 8 39 0.00  
3 56 42 27 43 29 21 89 66 42 30.01 29.90 29.78 10 10 7 21 4 24 T Rain
4 65 50 35 41 33 27 92 59 25 30.06 29.95 29.86 10 10 7 26 8 33 0.12 Rain
5 54 46 38 33 25 20 76 52 28 30.32 30.19 30.05 10 10 10 30 16 41 0.00  
6 57 48 38 29 23 21 52 39 26 30.44 30.39 30.32 10 10 10 24 11 33 T  
7 67 48 28 29 25 21 78 49 19 30.46 30.34 30.20 10 10 10 12 3 15 0.00  
8 78 57 35 32 27 22 75 44 13 30.23 30.09 29.93 10 10 10 21 6 26 0.00  
9 82 63 44 34 31 27 50 33 15 29.94 29.82 29.69 10 10 10 26 9 35 0.00  
10 56 45 33 32 12 3 45 29 13 30.24 30.05 29.80 10 10 10 31 14 39 0.00  
11 62 45 27 17 14 11 49 32 15 30.35 30.26 30.18 10 10 10 16 4 20 0.00  
12 71 51 31 21 18 15 54 34 14 30.36 30.28 30.21 10 10 10 14 4 16 0.00  
13 82 60 38 28 22 12 59 34 8 30.32 30.21 30.09 10 10 10 16 4 18 0.00  
14 82 62 42 34 25 19 50 30 10 30.23 30.14 30.06 10 10 10 10 4 15 0.00  
15 87 66 45 35 31 25 53 33 12 30.11 29.98 29.83 10 10 10 14 4 18 0.00  
16 85 68 51 40 33 28 51 33 15 29.88 29.79 29.69 10 10 10 23 8 31 0.00  
17 69 61 52 43 33 27 61 43 24 29.84 29.77 29.72 10 10 10 21 8 23 0.01 Thunderstorm
18 65 53 40 37 27 12 58 36 13 30.03 29.87 29.76 10 10 10 28 11 44 0.00  
19 66 50 33 28 26 24 64 43 22 30.12 30.07 30.03 10 10 10 18 5 24 0.00  
20 75 57 38 36 31 26 64 43 21 30.19 30.09 30.00 10 10 10 14 4 21 0.00  
21 77 64 50 56 44 35 87 57 27 30.04 29.91 29.74 10 9 6 32 6 43 0.17 Rain , Thunderstorm
22 62 54 46 54 37 28 86 58 29 29.79 29.75 29.71 10 10 10 33 12 43 0.05 Rain
23 58 51 43 35 29 26 62 47 32 29.83 29.77 29.70 10 10 10 29 15 38 T Rain
24 56 49 42 36 32 29 70 54 38 29.95 29.82 29.74 10 10 10 23 11 29 T Rain
25 47 44 40 34 31 25 70 56 42 30.01 29.98 29.90 10 10 10 22 11 29 T Rain
26 44 40 36 36 33 30 92 77 62 29.99 29.95 29.85 10 9 5 20 11 25 0.18 Rain
27 42 37 32 36 34 30 100 93 85 30.08 29.91 29.80 10 7 1 14 4 17 0.76 Rain , Snow
28 60 48 35 42 37 33 92 68 43 30.12 30.08 29.98 10 10 7 14 4 20 0.04 Rain
29 68 54 39 47 39 29 92 65 37 30.11 30.02 29.95 10 10 6 20 6 26 0.02 Rain , Thunderstorm
30 60 54 47 36 30 20 56 42 28 30.18 30.11 30.03 10 10 10 23 10 30 0.00  
31 65 53 40 46 41 36 92 68 43 30.21 30.11 30.02 10 10 10 18 5 23 T Rain