Weather History for Helena, MT

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Wednesday, April 18, 2012

  Actual Average Record
Temperature  
Mean Temperature 49 °F 46 °F  
Max Temperature 57 °F 59 °F 80 °F (1936)
Min Temperature 41 °F 33 °F 9 °F (1951)
Degree Days  
Heating Degree Days 16 19  
Month to date heating degree days 379 391  
Since 1 July heating degree days 6234 6843  
Cooling Degree Days 0 0  
Month to date cooling degree days 0 0  
Year to date cooling degree days 0 0  
Moisture  
Dew Point 30 °F    
Average Humidity 57    
Maximum Humidity 82    
Minimum Humidity 32    
Precipitation  
Precipitation 0.02 in 0.03 in 0.64 in (2003)
Month to date precipitation 0.50 0.54  
Year to date precipitation 3.22 1.79  
Snow  
Snow 0.00 in 0.10 in 2.90 in (1987)
Month to date snowfall T 2.4  
Since 1 July snowfall 40.1 35.9  
Snow Depth 0.00 in    
Sea Level Pressure  
Sea Level Pressure 29.94 in    
Wind  
Wind Speed 9 mph (West)    
Max Wind Speed 25 mph    
Max Gust Speed 33 mph    
Visibility 10 miles    
Events Rain    
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Daily Weather History Graph

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Date:

Astronomy

Apr. 18, 2012 Rise Set
Actual Time 6:34 AM MDT 8:20 PM MDT
Civil Twilight 6:02 AM MDT 8:52 PM MDT
Nautical Twilight 5:23 AM MDT 9:32 PM MDT
Astronomical Twilight 4:40 AM MDT 10:15 PM MDT
Moon 5:08 AM MDT (4/18) 6:09 PM MDT (4/18)
Length of Visible Light 14h 50m
Length of Day
13h 46m
Waning Crescent, 6% of the Moon is Illuminated
Apr 18
Waning Crescent
Apr 21
New
Apr 29
First Quarter
May 5
Full
May 12
Last Quarter

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 48.0 °F - 24.1 °F 39% 29.95 in 10.0 mi SSE 4.6 mph - N/A   Overcast
1:53 AM 46.0 °F 43.1 °F 27.0 °F 47% 29.92 in 10.0 mi WNW 5.8 mph - N/A   Overcast
2:53 AM 46.0 °F 43.1 °F 27.0 °F 47% 29.91 in 10.0 mi West 5.8 mph - N/A   Overcast
3:53 AM 45.0 °F - 28.0 °F 52% 29.88 in 10.0 mi Calm Calm - N/A   Overcast
4:53 AM 48.0 °F - 26.1 °F 42% 29.88 in 10.0 mi Calm Calm - N/A   Overcast
5:53 AM 43.0 °F 40.3 °F 35.1 °F 74% 29.89 in 8.0 mi SW 4.6 mph - 0.01 in Rain Light Rain
6:53 AM 41.0 °F 39.0 °F 37.0 °F 86% 29.90 in 10.0 mi WSW 3.5 mph - 0.01 in   Overcast
7:53 AM 42.1 °F 37.7 °F 37.9 °F 85% 29.92 in 10.0 mi West 6.9 mph - N/A   Overcast
8:53 AM 46.0 °F - 37.0 °F 71% 29.93 in 10.0 mi Calm Calm - N/A   Overcast
9:53 AM 48.0 °F - 36.0 °F 63% 29.93 in 10.0 mi WNW 8.1 mph - N/A   Scattered Clouds
10:53 AM 48.9 °F - 35.1 °F 59% 29.94 in 10.0 mi WNW 12.7 mph 19.6 mph N/A   Mostly Cloudy
11:53 AM 50.0 °F - 30.0 °F 46% 29.94 in 10.0 mi WNW 17.3 mph 28.8 mph N/A   Mostly Cloudy
12:53 PM 53.1 °F - 28.9 °F 40% 29.93 in 10.0 mi WNW 17.3 mph 25.3 mph N/A   Partly Cloudy
1:53 PM 55.0 °F - 28.0 °F 35% 29.92 in 10.0 mi West 13.8 mph 24.2 mph N/A   Scattered Clouds
2:53 PM 54.0 °F - 28.0 °F 37% 29.92 in 10.0 mi WNW 23.0 mph 31.1 mph N/A   Clear
3:53 PM 55.0 °F - 28.9 °F 37% 29.93 in 10.0 mi WNW 17.3 mph 24.2 mph N/A   Scattered Clouds
4:53 PM 55.0 °F - 27.0 °F 34% 29.91 in 10.0 mi West 18.4 mph 28.8 mph N/A   Clear
5:53 PM 53.1 °F - 28.0 °F 38% 29.94 in 10.0 mi West 12.7 mph 18.4 mph N/A   Scattered Clouds
6:53 PM 53.1 °F - 27.0 °F 37% 29.94 in 10.0 mi WSW 12.7 mph - N/A   Clear
7:53 PM 51.1 °F - 26.1 °F 38% 29.95 in 10.0 mi SW 5.8 mph - N/A   Clear
8:53 PM 48.9 °F - 27.0 °F 43% 29.96 in 10.0 mi SW 9.2 mph - N/A   Clear
9:53 PM 45.0 °F 39.7 °F 30.9 °F 58% 29.99 in 10.0 mi WSW 10.4 mph - N/A   Partly Cloudy
10:53 PM 45.0 °F 40.1 °F 30.0 °F 56% 30.01 in 10.0 mi WSW 9.2 mph - N/A   Partly Cloudy
11:53 PM 44.1 °F 40.1 °F 28.9 °F 55% 30.01 in 10.0 mi SW 6.9 mph - N/A   Clear