Weather History for KVSF - December, 2011

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Monday, December 19, 2011

  Actual Average Record
Temperature  
Mean Temperature 27 °F 24 °F  
Max Temperature 44 °F 33 °F 45 °F (1997)
Min Temperature 9 °F 16 °F 5 °F (2002)
Degree Days  
Heating Degree Days 38 41  
Month to date heating degree days 597 710  
Since 1 July heating degree days 1835 2353  
Cooling Degree Days 0 0  
Month to date cooling degree days 0  
Year to date cooling degree days 345  
Moisture  
Dew Point 14 °F    
Average Humidity 62    
Maximum Humidity 80    
Minimum Humidity 44    
Precipitation  
Precipitation T in 0.09 in 1.29 in (2003)
Month to date precipitation 1.83 2.05  
Year to date precipitation 52.86 42.63  
Sea Level Pressure  
Sea Level Pressure 30.01 in    
Wind  
Wind Speed 2 mph (South)    
Max Wind Speed 16 mph    
Max Gust Speed 22 mph    
Visibility 10 miles    
Events Rain    
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Astronomy

Dec. 19, 2011 Rise Set
Actual Time 7:18 AM EST 4:16 PM EST
Civil Twilight 6:45 AM EST 4:48 PM EST
Nautical Twilight 6:09 AM EST 5:24 PM EST
Astronomical Twilight 5:34 AM EST 5:59 PM EST
Moon 1:18 AM EST (12/19) 12:18 PM EST (12/19)
Length of Visible Light 10h 03m
Length of Day
8h 58m
Waning Crescent, 31% of the Moon is Illuminated
Dec 19
Waning Crescent
Dec 24
New
Jan 1
First Quarter
Jan 9
Full
Jan 16
Last Quarter

Hourly Weather History & Observations

Time (EST) Temp. Windchill Dew Point Humidity Pressure Visibility Wind Dir Wind Speed Gust Speed Precip Events Conditions
12:54 AM 9.0 °F - 3.0 °F 77% 30.27 in 8.0 mi Calm Calm - N/A   Clear
2:54 AM 9.0 °F - 1.9 °F 73% 30.25 in 10.0 mi Calm Calm - N/A   Clear
3:54 AM 9.0 °F - 3.0 °F 77% 30.24 in 10.0 mi Calm Calm - N/A   Clear
4:54 AM 10.0 °F - 3.9 °F 76% 30.21 in 10.0 mi Calm Calm - N/A   Clear
5:54 AM 10.0 °F - 3.0 °F 73% 30.18 in 10.0 mi Calm Calm - N/A   Clear
6:54 AM 12.0 °F - 5.0 °F 73% 30.18 in 10.0 mi Calm Calm - N/A   Mostly Cloudy
7:54 AM 12.9 °F - 7.0 °F 77% 30.15 in 10.0 mi Calm Calm - N/A   Overcast
8:54 AM 16.0 °F - 8.1 °F 71% 30.13 in 10.0 mi Calm Calm - N/A   Overcast
9:54 AM 19.9 °F - 8.1 °F 60% 30.08 in 10.0 mi Calm Calm - N/A   Mostly Cloudy
10:54 AM 25.0 °F 17.1 °F 10.0 °F 53% 30.03 in 10.0 mi SSE 6.9 mph - N/A   Clear
11:54 AM 30.0 °F 23.2 °F 12.9 °F 49% 29.97 in 10.0 mi SSE 6.9 mph - N/A   Clear
12:54 PM 33.1 °F 27.7 °F 15.1 °F 48% 29.93 in 10.0 mi Variable 5.8 mph - N/A   Overcast
1:54 PM 36.0 °F 31.1 °F 17.1 °F 46% 29.88 in 10.0 mi SSE 5.8 mph - N/A   Overcast
2:54 PM 37.0 °F - 18.0 °F 46% 29.85 in 10.0 mi Calm Calm - N/A   Mostly Cloudy
3:54 PM 37.9 °F 35.5 °F 19.9 °F 48% 29.86 in 10.0 mi SE 3.5 mph - N/A   Overcast
4:54 PM 35.1 °F - 21.0 °F 57% 29.86 in 10.0 mi Calm Calm - N/A   Overcast
5:54 PM 35.1 °F - 21.9 °F 59% 29.86 in 10.0 mi Calm Calm - N/A   Overcast
6:54 PM 34.0 °F - 23.0 °F 64% 29.85 in 10.0 mi Calm Calm - N/A   Overcast
9:54 PM 43.0 °F 41.3 °F 28.9 °F 58% 29.82 in 10.0 mi Variable 3.5 mph - N/A   Overcast
10:54 PM 44.1 °F - 30.9 °F 60% 29.82 in 10.0 mi Calm Calm - N/A   Overcast
11:54 PM 43.0 °F 36.4 °F 33.1 °F 68% 29.84 in 10.0 mi West 12.7 mph 21.9 mph 0.00 in Rain Light Rain