Weather History for Helena, MT

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Sunday, September 18, 2011

  Actual Average Record
Temperature  
Mean Temperature 61 °F 57 °F  
Max Temperature 70 °F 72 °F 91 °F (1966)
Min Temperature 51 °F 42 °F 19 °F (1965)
Degree Days  
Heating Degree Days 4 9  
Month to date heating degree days 65 107  
Since 1 July heating degree days 73 176  
Cooling Degree Days 0 0  
Month to date cooling degree days 19 22  
Year to date cooling degree days 351 405  
Growing Degree Days 10 (Base 50)    
Moisture  
Dew Point 36 °F    
Average Humidity 41    
Maximum Humidity 51    
Minimum Humidity 31    
Precipitation  
Precipitation 0.00 in 0.03 in 2.10 in (1882)
Month to date precipitation 0.04 0.70  
Year to date precipitation 11.89 9.25  
Snow  
Snow 0.00 in 0.00 in 13.10 in (1957)
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 30.12 in    
Wind  
Wind Speed 7 mph (West)    
Max Wind Speed 26 mph    
Max Gust Speed 33 mph    
Visibility 10 miles    
Events      
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Date:

Astronomy

Sep. 18, 2011 Rise Set
Actual Time 7:09 AM MDT 7:33 PM MDT
Civil Twilight 6:39 AM MDT 8:04 PM MDT
Nautical Twilight 6:03 AM MDT 8:39 PM MDT
Astronomical Twilight 5:26 AM MDT 9:16 PM MDT
Moon 10:27 PM MDT (9/18) 1:35 PM MDT (9/18)
Length of Visible Light 13h 25m
Length of Day
12h 24m
Waning Gibbous, 67% of the Moon is Illuminated
Sep 18
Waning Gibbous
Sep 20
Last Quarter
Sep 27
New
Oct 3
First Quarter
Oct 11
Full

Hourly Weather History & Observations

Time (MDT) Temp. Dew Point Humidity Pressure Visibility Wind Dir Wind Speed Gust Speed Precip Events Conditions
12:53 AM 55.0 °F 30.0 °F 38% 30.06 in 10.0 mi West 6.9 mph - N/A   Overcast
1:53 AM 53.1 °F 30.9 °F 43% 30.07 in 10.0 mi West 5.8 mph - N/A   Overcast
2:53 AM 51.8 °F 33.8 °F 50% 30.08 in 10.0 mi Calm Calm - N/A   Overcast
3:53 AM 52.0 °F 33.1 °F 49% 30.09 in 10.0 mi NW 3.5 mph - N/A   Overcast
4:53 AM 53.1 °F 32.0 °F 45% 30.09 in 10.0 mi Calm Calm - N/A   Overcast
5:53 AM 51.8 °F 33.8 °F 50% 30.10 in 10.0 mi Calm Calm - N/A   Overcast
6:53 AM 53.1 °F 34.0 °F 48% 30.12 in 10.0 mi Calm Calm - N/A   Overcast
7:53 AM 52.0 °F 34.0 °F 50% 30.15 in 10.0 mi Calm Calm - N/A   Overcast
8:53 AM 53.1 °F 34.0 °F 48% 30.16 in 10.0 mi Calm Calm - N/A   Overcast
9:53 AM 55.9 °F 35.1 °F 45% 30.15 in 10.0 mi East 4.6 mph - N/A   Overcast
10:53 AM 61.0 °F 34.0 °F 36% 30.15 in 10.0 mi Calm Calm - N/A   Overcast
11:53 AM 60.1 °F 34.0 °F 38% 30.17 in 10.0 mi East 4.6 mph - N/A   Overcast
12:53 PM 66.9 °F 36.0 °F 32% 30.14 in 10.0 mi West 17.3 mph 20.7 mph N/A   Mostly Cloudy
1:11 PM 68.0 °F 35.6 °F 30% 30.14 in 10.0 mi West 13.8 mph 23.0 mph N/A   Mostly Cloudy
1:53 PM 66.9 °F 37.0 °F 33% 30.13 in 10.0 mi West 20.7 mph 26.5 mph N/A   Scattered Clouds
2:53 PM 68.0 °F 37.9 °F 33% 30.13 in 10.0 mi West 20.7 mph 29.9 mph N/A   Partly Cloudy
3:53 PM 69.1 °F 37.9 °F 32% 30.12 in 10.0 mi West 19.6 mph 29.9 mph N/A   Clear
4:53 PM 66.9 °F 37.0 °F 33% 30.12 in 10.0 mi West 12.7 mph 25.3 mph N/A   Clear
5:53 PM 69.1 °F 37.9 °F 32% 30.10 in 10.0 mi West 17.3 mph - N/A   Clear
6:53 PM 66.9 °F 39.0 °F 36% 30.11 in 10.0 mi WNW 12.7 mph - N/A   Clear
7:53 PM 63.0 °F 39.0 °F 41% 30.13 in 10.0 mi West 12.7 mph - N/A   Clear
8:53 PM 62.6 °F 39.2 °F 42% 30.13 in 10.0 mi WSW 9.2 mph - N/A   Clear
9:53 PM 59.0 °F 39.0 °F 48% 30.14 in 10.0 mi East 3.5 mph - N/A   Clear
10:53 PM 59.0 °F 39.9 °F 49% 30.12 in 10.0 mi Calm Calm - N/A   Clear
11:53 PM 57.0 °F 39.0 °F 51% 30.12 in 10.0 mi Calm Calm - N/A   Clear