Weather History for KSFO - December, 2010

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Friday, December 31, 2010

  Actual Average Record
Temperature  
Mean Temperature 44 °F 50 °F  
Max Temperature 49 °F 56 °F 67 °F (1958)
Min Temperature 38 °F 44 °F 29 °F (1978)
Degree Days  
Heating Degree Days 21 15  
Month to date heating degree days 392 445  
Since 1 July heating degree days 906 1010  
Cooling Degree Days 0 0  
Month to date cooling degree days 0 0  
Year to date cooling degree days 281 164  
Moisture  
Dew Point 38 °F    
Average Humidity 77    
Maximum Humidity 92    
Minimum Humidity 61    
Precipitation  
Precipitation T in 0.14 in 1.86 in (2005)
Month to date precipitation 6.00 4.03  
Year to date precipitation 24.15 20.65  
Since 1 July precipitation 9.26 7.57  
Sea Level Pressure  
Sea Level Pressure 30.05 in    
Wind  
Wind Speed 3 mph (ENE)    
Max Wind Speed 9 mph    
Max Gust Speed 12 mph    
Visibility 10 miles    
Events Rain    
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Astronomy

Dec. 31, 2010 Rise Set
Actual Time 7:24 AM PST 5:00 PM PST
Civil Twilight 6:55 AM PST 5:30 PM PST
Nautical Twilight 6:22 AM PST 6:02 PM PST
Astronomical Twilight 5:50 AM PST 6:34 PM PST
Moon 3:58 AM PST (12/31) 1:53 PM PST (12/31)
Length of Visible Light 10h 35m
Length of Day
9h 36m
Waning Crescent, 14% of the Moon is Illuminated
Dec 31
Waning Crescent
Jan 4
New
Jan 12
First Quarter
Jan 19
Full
Jan 26
Last Quarter

Hourly Weather History & Observations

Time (PST) Temp. Windchill Dew Point Humidity Pressure Visibility Wind Dir Wind Speed Gust Speed Precip Events Conditions
12:56 AM 46.0 °F 44.8 °F 37.9 °F 73% 29.99 in 10.0 mi WNW 3.5 mph - N/A   Partly Cloudy
1:56 AM 43.0 °F - 37.9 °F 82% 29.99 in 10.0 mi Calm Calm - N/A   Partly Cloudy
2:56 AM 42.1 °F - 37.0 °F 82% 30.00 in 10.0 mi Calm Calm - N/A   Partly Cloudy
3:56 AM 39.9 °F - 37.0 °F 89% 30.01 in 10.0 mi Calm Calm - N/A   Partly Cloudy
4:56 AM 39.9 °F 37.8 °F 36.0 °F 86% 30.02 in 10.0 mi WSW 3.5 mph - N/A   Partly Cloudy
5:56 AM 39.0 °F - 36.0 °F 89% 30.04 in 10.0 mi Calm Calm - N/A   Partly Cloudy
6:56 AM 43.0 °F 39.5 °F 37.9 °F 82% 30.05 in 10.0 mi NNW 5.8 mph - N/A   Partly Cloudy
7:56 AM 44.6 °F 43.1 °F 37.4 °F 76% 30.06 in 10.0 mi NE 3.5 mph - N/A   Mostly Cloudy
8:56 AM 45.0 °F 42.6 °F 39.0 °F 80% 30.07 in 10.0 mi ENE 4.6 mph - N/A   Mostly Cloudy
9:56 AM 45.0 °F 42.6 °F 39.9 °F 82% 30.09 in 10.0 mi East 4.6 mph - N/A   Mostly Cloudy
10:56 AM 46.0 °F 43.1 °F 39.9 °F 79% 30.09 in 10.0 mi ENE 5.8 mph - N/A   Mostly Cloudy
11:56 AM 46.9 °F - 41.0 °F 80% 30.08 in 10.0 mi ENE 4.6 mph - N/A   Mostly Cloudy
12:56 PM 46.9 °F - 39.0 °F 74% 30.08 in 10.0 mi Calm Calm - N/A   Mostly Cloudy
1:56 PM 48.0 °F - 37.0 °F 66% 30.07 in 10.0 mi NE 5.8 mph - N/A   Overcast
2:56 PM 48.0 °F - 37.0 °F 66% 30.06 in 10.0 mi East 4.6 mph - N/A   Overcast
3:56 PM 48.0 °F - 35.1 °F 61% 30.07 in 10.0 mi Calm Calm - N/A   Overcast
4:56 PM 48.0 °F - 37.0 °F 66% 30.05 in 10.0 mi ENE 4.6 mph - 0.00 in   Overcast
5:56 PM 48.0 °F - 37.9 °F 68% 30.05 in 10.0 mi Calm Calm - 0.00 in   Overcast
6:56 PM 48.0 °F - 39.0 °F 71% 30.05 in 10.0 mi Calm Calm - N/A   Overcast
7:56 PM 48.0 °F - 39.0 °F 71% 30.06 in 10.0 mi ENE 3.5 mph - N/A   Overcast
8:56 PM 48.0 °F - 39.9 °F 74% 30.05 in 10.0 mi East 6.9 mph - N/A   Overcast
9:56 PM 48.0 °F - 41.0 °F 77% 30.05 in 10.0 mi SE 6.9 mph - 0.00 in Rain Light Rain
10:56 PM 46.9 °F - 41.0 °F 80% 30.04 in 10.0 mi SE 4.6 mph - 0.00 in   Overcast
11:56 PM 48.2 °F - 41.0 °F 76% 30.03 in 10.0 mi SSE 5.8 mph - N/A   Overcast