Weather History for Helena, MT

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Thursday, September 29, 2011

  Actual Average Record
Temperature  
Mean Temperature 54 °F 52 °F  
Max Temperature 72 °F 67 °F 84 °F (1967)
Min Temperature 35 °F 38 °F 19 °F (1985)
Degree Days  
Heating Degree Days 11 13  
Month to date heating degree days 118 226  
Since 1 July heating degree days 126 295  
Cooling Degree Days 0 0  
Month to date cooling degree days 25 22  
Year to date cooling degree days 357 405  
Growing Degree Days 4 (Base 50)    
Moisture  
Dew Point 26 °F    
Average Humidity 37    
Maximum Humidity 56    
Minimum Humidity 17    
Precipitation  
Precipitation 0.00 in 0.03 in 0.53 in (2007)
Month to date precipitation 0.04 1.07  
Year to date precipitation 11.89 9.62  
Snow  
Snow 0.00 in 0.00 in 3.70 in (1881)
Month to date snowfall 0.0 1.2  
Since 1 July snowfall 0.0 1.5  
Since 1 September snowfall 0.0 1.2  
Snow Depth 0.00 in    
Sea Level Pressure  
Sea Level Pressure 30.29 in    
Wind  
Wind Speed 5 mph (East)    
Max Wind Speed 15 mph    
Max Gust Speed 22 mph    
Visibility 10 miles    
Events      
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Date:

Astronomy

Sep. 29, 2011 Rise Set
Actual Time 7:23 AM MDT 7:12 PM MDT
Civil Twilight 6:53 AM MDT 7:42 PM MDT
Nautical Twilight 6:18 AM MDT 8:17 PM MDT
Astronomical Twilight 5:42 AM MDT 8:52 PM MDT
Moon 10:28 AM MDT (9/29) 8:10 PM MDT (9/29)
Length of Visible Light 12h 48m
Length of Day
11h 48m
Waxing Crescent, 8% of the Moon is Illuminated
Sep 29
Waxing Crescent
Oct 3
First Quarter
Oct 11
Full
Oct 19
Last Quarter
Oct 26
New

Hourly Weather History & Observations

Time (MDT) Temp. Windchill Dew Point Humidity Pressure Visibility Wind Dir Wind Speed Gust Speed Precip Events Conditions
12:53 AM 46.9 °F - 23.0 °F 39% 30.40 in 10.0 mi WSW 9.2 mph - N/A   Clear
1:53 AM 44.6 °F 39.7 °F 23.0 °F 43% 30.40 in 10.0 mi WSW 9.2 mph - N/A   Clear
2:53 AM 45.0 °F 40.6 °F 21.9 °F 40% 30.42 in 10.0 mi WSW 8.1 mph - N/A   Clear
3:53 AM 39.9 °F 37.8 °F 25.0 °F 55% 30.41 in 10.0 mi ENE 3.5 mph - N/A   Clear
4:53 AM 39.0 °F - 21.9 °F 50% 30.43 in 10.0 mi Calm Calm - N/A   Clear
5:53 AM 37.0 °F - 23.0 °F 57% 30.43 in 10.0 mi Calm Calm - N/A   Clear
6:53 AM 36.0 °F - 21.9 °F 57% 30.44 in 10.0 mi Calm Calm - N/A   Clear
7:53 AM 39.0 °F - 23.0 °F 53% 30.44 in 10.0 mi Calm Calm - N/A   Clear
8:53 AM 42.1 °F - 23.0 °F 47% 30.43 in 10.0 mi Calm Calm - N/A   Clear
9:53 AM 45.0 °F - 26.1 °F 48% 30.41 in 10.0 mi Calm Calm - N/A   Clear
10:53 AM 50.0 °F - 27.0 °F 41% 30.39 in 10.0 mi Variable 3.5 mph - N/A   Clear
11:53 AM 57.0 °F - 26.1 °F 30% 30.33 in 10.0 mi ENE 4.6 mph - N/A   Clear
12:53 PM 64.0 °F - 25.0 °F 23% 30.27 in 10.0 mi NE 9.2 mph - N/A   Clear
1:53 PM 68.0 °F - 24.8 °F 20% 30.22 in 10.0 mi East 9.2 mph 17.3 mph N/A   Clear
2:53 PM 71.1 °F - 25.0 °F 18% 30.19 in 10.0 mi East 13.8 mph 19.6 mph N/A   Clear
3:53 PM 72.0 °F - 25.0 °F 17% 30.18 in 10.0 mi East 15.0 mph 19.6 mph N/A   Clear
4:53 PM 72.0 °F - 26.1 °F 18% 30.16 in 10.0 mi East 13.8 mph - N/A   Clear
5:53 PM 71.6 °F - 26.6 °F 19% 30.13 in 10.0 mi East 9.2 mph - N/A   Clear
6:53 PM 66.2 °F - 28.4 °F 24% 30.12 in 10.0 mi ENE 4.6 mph - N/A   Clear
7:53 PM 59.0 °F - 30.0 °F 33% 30.17 in 10.0 mi WSW 8.1 mph - N/A   Clear
8:53 PM 57.0 °F - 28.9 °F 34% 30.17 in 10.0 mi SW 3.5 mph - N/A   Clear
9:53 PM 53.6 °F - 28.4 °F 38% 30.14 in 10.0 mi Calm Calm - N/A   Clear
10:53 PM 51.1 °F - 30.0 °F 44% 30.17 in 10.0 mi Variable 3.5 mph - N/A   Clear
11:53 PM 50.0 °F - 28.9 °F 44% 30.14 in 10.0 mi Calm Calm - N/A   Clear