Weather History for Helena, MT

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Month of April, 2012

  Max Avg Min Sum
Temperature  
Max Temperature 83 °F 61 °F 39 °F
Mean Temperature 65 °F 49 °F 35 °F
Min Temperature 50 °F 36 °F 23 °F
Degree Days  
Heating Degree Days (base 65) 30 16 0 489
Cooling Degree Days (base 65) 0 0 0 0
Growing Degree Days (base 50) 16 3 0 85
Dew Point  
Dew Point 50 °F 28 °F 0 °F
Precipitation  
Precipitation 0.20 in 0.02 in 0.00 in 0.56 in
Snowdepth 0.0 in 0.0 in 0.0 in -
Wind  
Wind 36 mph 8 mph 0 mph
Gust Wind 47 mph 23 mph 16 mph
Sea Level Pressure  
Sea Level Pressure 30.47 in 29.96 in 29.33 in

Monthly Weather History Graph

Monthly Weather History Graph

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Date:

Astronomy

Apr. 30, 2012 Rise Set
Actual Time 6:14 AM MDT 8:36 PM MDT
Civil Twilight 5:40 AM MDT 9:10 PM MDT
Nautical Twilight 4:58 AM MDT 9:52 PM MDT
Astronomical Twilight 4:11 AM MDT 10:40 PM MDT
Moon 2:16 PM MDT (4/30) 3:03 AM MDT (4/30)
Length of Visible Light 15h 30m
Length of Day
14h 22m
Waxing Gibbous, 64% of the Moon is Illuminated
Apr 30
Waxing Gibbous
May 5
Full
May 12
Last Quarter
May 20
New
May 28
First Quarter

Weather History Calendar

Precipitation Actual month total 0.56 Normal Month Total: 0.98
Sunday Monday Tuesday Wednesday Thursday Friday Saturday
Rain
Actual:
53 | 34 0.11
Average:
54 | 29 0.03
Clear
Actual:
51 | 29 0.00
Average:
54 | 29 0.02
Clear
Actual:
65 | 23 0.00
Average:
54 | 29 0.02
Scattered Clouds
Actual:
68 | 34 0.00
Average:
54 | 29 0.03
Partly Cloudy
Actual:
49 | 32 T
Average:
55 | 30 0.03
Snow
Actual:
39 | 31 0.20
Average:
55 | 30 0.03
Snow
Actual:
47 | 27 T
Average:
55 | 30 0.03
Clear
Actual:
56 | 24 0.00
Average:
56 | 30 0.03
Clear
Actual:
56 | 30 0.00
Average:
56 | 31 0.03
Clear
Actual:
67 | 31 0.00
Average:
56 | 31 0.03
Clear
Actual:
74 | 33 0.00
Average:
56 | 31 0.03
Rain
Actual:
58 | 36 0.11
Average:
57 | 31 0.03
Scattered Clouds
Actual:
62 | 27 0.00
Average:
57 | 31 0.04
Scattered Clouds
Actual:
61 | 29 0.00
Average:
57 | 32 0.03
Snow
Actual:
41 | 31 0.03
Average:
58 | 32 0.03
Partly Cloudy
Actual:
56 | 31 0.00
Average:
58 | 32 0.04
Partly Cloudy
Actual:
59 | 34 0.00
Average:
58 | 32 0.03
Rain
Actual:
57 | 41 0.02
Average:
59 | 33 0.03
Partly Cloudy
Actual:
58 | 37 T
Average:
59 | 33 0.04
Partly Cloudy
Actual:
70 | 44 0.00
Average:
59 | 33 0.03
Partly Cloudy
Actual:
70 | 44 T
Average:
59 | 33 0.04
Clear
Actual:
82 | 37 0.00
Average:
60 | 34 0.03
Clear
Actual:
83 | 45 0.00
Average:
60 | 34 0.03
Scattered Clouds
Actual:
80 | 49 0.00
Average:
60 | 34 0.04
Scattered Clouds
Actual:
77 | 46 0.00
Average:
61 | 34 0.04
Rain
Actual:
76 | 50 0.07
Average:
61 | 35 0.03
Rain
Actual:
48 | 40 0.02
Average:
61 | 35 0.04
Overcast
Actual:
51 | 40 0.00
Average:
62 | 35 0.04
Partly Cloudy
Actual:
60 | 41 0.00
Average:
62 | 36 0.04
Partly Cloudy
Actual:
66 | 39 0.00
Average:
62 | 36 0.04
 

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
Apr high avg low high avg low high avg low high avg low high avg low high avg high sum  
1 53 44 34 43 28 16 86 58 30 30.09 29.69 29.33 10 10 5 29 12 47 0.11 Rain
2 51 40 29 17 15 10 53 37 20 30.35 30.27 30.13 10 10 10 22 6 28 0.00  
3 65 44 23 25 19 13 74 44 14 30.28 30.07 29.83 10 10 10 20 3 31 0.00  
4 68 51 34 30 24 17 70 44 18 29.94 29.72 29.52 10 10 10 30 9 38 0.00  
5 49 41 32 27 18 13 59 42 24 30.02 29.96 29.91 10 10 10 15 7 20 T  
6 39 35 31 31 28 22 100 74 48 30.30 29.95 29.81 10 5 0 21 9 25 0.20 Fog , Snow
7 47 37 27 28 19 13 75 50 25 30.42 30.33 30.17 10 10 4 21 7 26 T Snow
8 56 40 24 24 21 19 75 51 26 30.47 30.38 30.24 10 10 10 10 4 13 0.00  
9 56 43 30 29 22 16 60 45 29 30.36 30.26 30.15 10 10 10 9 5 17 0.00  
10 67 49 31 35 30 26 78 52 26 30.18 30.04 29.88 10 10 10 13 3 16 0.00  
11 74 54 33 36 33 30 82 54 25 29.92 29.69 29.47 10 10 10 14 3 18 0.00  
12 58 47 36 40 31 25 76 54 32 29.77 29.63 29.49 10 10 9 29 13 36 0.11 Rain
13 62 45 27 29 24 16 84 52 19 29.87 29.77 29.68 10 10 10 23 7 32 0.00  
14 61 45 29 29 18 0 72 41 9 29.92 29.80 29.71 10 10 10 22 7 36 0.00  
15 41 36 31 33 29 23 92 73 54 30.21 30.06 29.93 10 6 0 17 8 20 0.03 Fog , Snow
16 56 44 31 36 31 25 92 61 30 30.20 30.09 29.97 10 10 10 20 5 25 0.00  
17 59 47 34 35 26 18 79 50 21 30.11 30.04 29.98 10 10 10 20 9 26 0.00  
18 57 49 41 38 30 24 82 57 32 30.01 29.94 29.88 10 10 7 25 9 33 0.02 Rain
19 58 48 37 34 25 18 79 51 22 30.12 30.07 29.99 10 10 10 24 9 32 T  
20 70 57 44 37 31 23 59 42 24 30.11 30.02 29.93 10 10 10 31 10 39 0.00  
21 70 57 44 41 38 35 77 54 30 30.19 30.14 30.08 10 10 10 15 6 24 T  
22 82 60 37 40 35 28 85 51 16 30.22 30.10 29.99 10 10 10 10 3 13 0.00  
23 83 64 45 42 37 33 71 46 21 30.06 29.93 29.82 10 10 10 16 5 18 0.00  
24 80 65 49 44 38 34 66 43 19 29.83 29.78 29.73 10 10 10 29 10 37 0.00  
25 77 62 46 43 38 35 71 47 23 29.94 29.84 29.75 10 10 10 22 6 31 0.00  
26 76 63 50 50 45 37 89 58 27 29.75 29.56 29.36 10 10 7 18 5 24 0.07 Rain
27 48 44 40 38 27 22 76 61 45 30.10 29.93 29.62 10 10 10 35 20 46 0.02 Rain
28 51 46 40 28 26 24 54 45 36 30.17 30.10 30.01 10 10 10 25 15 33 0.00  
29 60 51 41 30 28 27 57 45 32 30.07 30.01 29.93 10 10 10 24 12 32 0.00  
30 66 53 39 38 33 29 70 51 32 29.92 29.71 29.52 10 10 10 36 6 45 0.00