Weather History for Helena, MT

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Monday, September 17, 2012

  Actual Average Record
Temperature  
Mean Temperature 60 °F 57 °F  
Max Temperature 78 °F 72 °F 90 °F (1998)
Min Temperature 41 °F 43 °F 20 °F (1965)
Degree Days  
Heating Degree Days 5 8  
Month to date heating degree days 75 98  
Since 1 July heating degree days 96 167  
Cooling Degree Days 0 1  
Month to date cooling degree days 5 22  
Year to date cooling degree days 529 405  
Growing Degree Days 10 (Base 50)    
Moisture  
Dew Point 30 °F    
Average Humidity 39    
Maximum Humidity 62    
Minimum Humidity 16    
Precipitation  
Precipitation 0.00 in 0.04 in 0.98 in (1908)
Month to date precipitation 0.00 0.67  
Year to date precipitation 6.47 9.22  
Snow  
Snow 0.00 in 0.00 in 3.40 in (1988)
Month to date snowfall 0.0 0.6  
Since 1 July snowfall 0.0 0.9  
Since 1 September snowfall 0.0 0.6  
Snow Depth 0.00 in    
Sea Level Pressure  
Sea Level Pressure 30.17 in    
Wind  
Wind Speed 2 mph (East)    
Max Wind Speed 9 mph    
Max Gust Speed 13 mph    
Visibility 10 miles    
Events      
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Date:

Astronomy

Sep. 17, 2012 Rise Set
Actual Time 7:09 AM MDT 7:34 PM MDT
Civil Twilight 6:38 AM MDT 8:04 PM MDT
Nautical Twilight 6:02 AM MDT 8:40 PM MDT
Astronomical Twilight 5:25 AM MDT 9:17 PM MDT
Moon 9:13 AM MDT (9/17) 8:06 PM MDT (9/17)
Length of Visible Light 13h 25m
Length of Day
12h 25m
Waxing Crescent, 4% of the Moon is Illuminated
Sep 17
Waxing Crescent
Sep 22
First Quarter
Sep 29
Full
Oct 8
Last Quarter
Oct 15
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 48.9 °F - 28.9 °F 46% 30.22 in 10.0 mi East 3.5 mph - N/A   Clear
1:53 AM 46.9 °F - 30.0 °F 52% 30.22 in 10.0 mi SSE 3.5 mph - N/A   Clear
2:53 AM 46.9 °F - 30.0 °F 52% 30.22 in 10.0 mi Calm Calm - N/A   Scattered Clouds
3:53 AM 46.9 °F - 30.0 °F 52% 30.22 in 10.0 mi Calm Calm - N/A   Overcast
4:53 AM 43.0 °F 41.3 °F 30.9 °F 62% 30.23 in 10.0 mi NNE 3.5 mph - N/A   Overcast
5:53 AM 44.6 °F - 30.2 °F 57% 30.21 in 10.0 mi Calm Calm - N/A   Clear
6:53 AM 44.1 °F - 30.0 °F 58% 30.24 in 10.0 mi Calm Calm - N/A   Clear
7:53 AM 44.1 °F - 30.9 °F 60% 30.25 in 10.0 mi Calm Calm - N/A   Partly Cloudy
8:53 AM 48.0 °F - 30.9 °F 52% 30.25 in - Calm Calm - N/A   Clear
9:53 AM 52.0 °F - 32.0 °F 47% 30.25 in - Calm Calm - N/A   Clear
10:53 AM 55.9 °F - 33.1 °F 42% 30.24 in - Variable 3.5 mph - N/A   Clear
11:53 AM 60.1 °F - 34.0 °F 38% 30.21 in - ENE 4.6 mph - N/A   Clear
12:53 PM 66.0 °F - 34.0 °F 30% 30.18 in - Variable 4.6 mph - N/A   Clear
1:53 PM 71.1 °F - 34.0 °F 26% 30.14 in - ENE 6.9 mph - N/A   Clear
2:53 PM 73.0 °F - 30.9 °F 21% 30.11 in - East 3.5 mph - N/A   Clear
3:53 PM 75.0 °F - 28.9 °F 18% 30.09 in - Calm Calm - N/A   Clear
4:53 PM 77.0 °F - 28.9 °F 17% 30.08 in - Calm Calm - N/A   Clear
5:53 PM 77.0 °F - 28.0 °F 17% 30.07 in - Variable 5.8 mph - N/A   Clear
6:53 PM 75.0 °F - 30.0 °F 19% 30.08 in - Calm Calm - N/A   Clear
7:53 PM 70.0 °F - 30.0 °F 23% 30.09 in - SW 3.5 mph - N/A   Clear
8:53 PM 64.9 °F - 28.9 °F 26% 30.11 in - West 4.6 mph - N/A   Clear
9:53 PM 64.0 °F - 28.0 °F 26% 30.12 in - Calm Calm - N/A   Clear
10:53 PM 62.1 °F - 28.0 °F 28% 30.12 in - Calm Calm - N/A   Clear
11:53 PM 61.0 °F - 28.0 °F 29% 30.12 in - Calm Calm - N/A   Clear