Weather History for San Francisco, CA

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Tuesday, December 11, 2012

  Actual Average Record
Temperature  
Mean Temperature 52 °F 51 °F  
Max Temperature 58 °F 57 °F 74 °F (1958)
Min Temperature 46 °F 45 °F 26 °F (1972)
Degree Days  
Heating Degree Days 13 14  
Month to date heating degree days 97 148  
Since 1 July heating degree days 692 712  
Cooling Degree Days 0 0  
Month to date cooling degree days 0 0  
Year to date cooling degree days 86 164  
Moisture  
Dew Point 46 °F    
Average Humidity 80    
Maximum Humidity 89    
Minimum Humidity 71    
Precipitation  
Precipitation T in 0.12 in 3.16 in (1995)
Month to date precipitation 2.24 1.25  
Year to date precipitation 17.46 17.87  
Since 1 July precipitation 7.00 4.79  
Sea Level Pressure  
Sea Level Pressure 29.98 in    
Wind  
Wind Speed 7 mph (WSW)    
Max Wind Speed 22 mph    
Max Gust Speed 26 mph    
Visibility 8 miles    
Events Fog , Rain    
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Date:

Astronomy

Dec. 11, 2012 Rise Set
Actual Time 7:14 AM PST 4:51 PM PST
Civil Twilight 6:45 AM PST 5:20 PM PST
Nautical Twilight 6:12 AM PST 5:53 PM PST
Astronomical Twilight 5:40 AM PST 6:25 PM PST
Moon 5:17 AM PST (12/11) 3:34 PM PST (12/11)
Length of Visible Light 10h 35m
Length of Day
9h 36m
Waning Crescent, 4% of the Moon is Illuminated
Dec 11
Waning Crescent
Dec 13
New
Dec 19
First Quarter
Dec 28
Full
Jan 4
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 51.1 °F - 44.1 °F 77% 30.10 in 10.0 mi Calm Calm - N/A   Clear
1:56 AM 48.9 °F - 42.1 °F 77% 30.09 in 10.0 mi Calm Calm - N/A   Clear
2:56 AM 46.9 °F - 41.0 °F 80% 30.08 in 10.0 mi Calm Calm - N/A   Clear
3:56 AM 46.0 °F 44.8 °F 41.0 °F 83% 30.08 in 10.0 mi WSW 3.5 mph - N/A   Partly Cloudy
4:56 AM 46.9 °F - 42.1 °F 83% 30.06 in 10.0 mi West 5.8 mph - N/A   Partly Cloudy
5:56 AM 46.9 °F - 42.1 °F 83% 30.05 in 10.0 mi West 4.6 mph - N/A   Partly Cloudy
6:56 AM 48.9 °F - 45.0 °F 86% 30.05 in 10.0 mi WNW 3.5 mph - N/A   Partly Cloudy
7:43 AM 50.0 °F - 46.4 °F 87% 30.05 in 10.0 mi WNW 4.6 mph - N/A   Mostly Cloudy
7:56 AM 51.1 °F - 48.0 °F 89% 30.05 in 9.0 mi West 4.6 mph - N/A   Mostly Cloudy
8:47 AM 51.8 °F - 48.2 °F 88% 30.05 in 3.0 mi Calm Calm - N/A   Overcast
8:50 AM 51.8 °F - 48.2 °F 88% 30.05 in 0.5 mi Calm Calm - N/A Fog Fog
8:56 AM 51.8 °F - 48.2 °F 88% 30.04 in 0.2 mi Calm Calm - N/A Fog Fog
9:56 AM 52.0 °F - 48.9 °F 89% 30.04 in 1.0 mi West 3.5 mph - N/A   Overcast
10:06 AM 53.6 °F - 50.0 °F 88% 30.04 in 3.0 mi Calm Calm - N/A   Mostly Cloudy
10:56 AM 55.9 °F - 50.0 °F 80% 30.02 in 5.0 mi Calm Calm - N/A   Haze
11:56 AM 57.0 °F - 48.9 °F 74% 30.00 in 10.0 mi West 11.5 mph - N/A   Scattered Clouds
12:56 PM 57.0 °F - 48.0 °F 72% 29.98 in 10.0 mi West 21.9 mph - N/A   Partly Cloudy
1:16 PM 55.4 °F - 48.2 °F 77% 29.98 in 10.0 mi West 19.6 mph 24.2 mph N/A   Mostly Cloudy
1:56 PM 54.0 °F - 46.9 °F 77% 29.96 in 10.0 mi WSW 15.0 mph - N/A   Mostly Cloudy
2:56 PM 54.0 °F - 46.9 °F 77% 29.95 in 10.0 mi WSW 13.8 mph - N/A   Mostly Cloudy
3:56 PM 54.0 °F - 46.0 °F 75% 29.94 in 10.0 mi WSW 10.4 mph - N/A   Overcast
4:26 PM 53.6 °F - 46.4 °F 77% 29.93 in 10.0 mi WSW 9.2 mph - N/A   Mostly Cloudy
4:56 PM 54.0 °F - 45.0 °F 72% 29.93 in 10.0 mi WSW 12.7 mph - N/A   Mostly Cloudy
5:56 PM 54.0 °F - 45.0 °F 72% 29.91 in 10.0 mi SW 5.8 mph - N/A   Mostly Cloudy
6:56 PM 54.0 °F - 44.1 °F 69% 29.90 in 10.0 mi WSW 9.2 mph - N/A   Mostly Cloudy
7:56 PM 54.0 °F - 44.1 °F 69% 29.90 in 10.0 mi WSW 13.8 mph - N/A   Mostly Cloudy
8:56 PM 54.0 °F - 44.1 °F 69% 29.90 in 10.0 mi WSW 10.4 mph - N/A   Mostly Cloudy
9:30 PM 53.6 °F - 44.6 °F 72% 29.88 in 10.0 mi SSW 6.9 mph - N/A   Overcast
9:56 PM 54.0 °F - 45.0 °F 72% 29.88 in 10.0 mi South 4.6 mph - N/A   Overcast
10:33 PM 53.6 °F - 44.6 °F 72% 29.88 in 10.0 mi SSW 5.8 mph - N/A   Overcast
10:56 PM 53.1 °F - 46.0 °F 77% 29.88 in 9.0 mi SW 4.6 mph - 0.00 in Rain Light Rain
11:21 PM 53.6 °F - 46.4 °F 77% 29.88 in 10.0 mi SE 10.4 mph - 0.00 in   Overcast
11:56 PM 52.0 °F - 46.9 °F 83% 29.88 in 8.0 mi SE 11.5 mph - 0.00 in Rain Light Rain