Weather History for San Francisco, CA

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Tuesday, December 18, 2012

  Actual Average Record
Temperature  
Mean Temperature 49 °F 50 °F  
Max Temperature 53 °F 56 °F 65 °F (1958)
Min Temperature 44 °F 44 °F 30 °F (1965)
Degree Days  
Heating Degree Days 16 15  
Month to date heating degree days 204 250  
Since 1 July heating degree days 799 814  
Cooling Degree Days 0 0  
Month to date cooling degree days 0 0  
Year to date cooling degree days 86 164  
Moisture  
Dew Point 31 °F    
Average Humidity 54    
Maximum Humidity 66    
Minimum Humidity 41    
Precipitation  
Precipitation 0.00 in 0.14 in 1.77 in (2005)
Month to date precipitation 2.62 2.15  
Year to date precipitation 17.84 18.77  
Since 1 July precipitation 7.38 5.69  
Sea Level Pressure  
Sea Level Pressure 30.08 in    
Wind  
Wind Speed 13 mph (WNW)    
Max Wind Speed 28 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

Dec. 18, 2012 Rise Set
Actual Time 7:19 AM PST 4:53 PM PST
Civil Twilight 6:50 AM PST 5:22 PM PST
Nautical Twilight 6:17 AM PST 5:55 PM PST
Astronomical Twilight 5:45 AM PST 6:27 PM PST
Moon 11:08 AM PST (12/18) 11:18 PM PST (12/18)
Length of Visible Light 10h 32m
Length of Day
9h 33m
Waxing Crescent, 36% of the Moon is Illuminated
Dec 18
Waxing Crescent
Dec 19
First Quarter
Dec 28
Full
Jan 4
Last Quarter
Jan 11
New

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 48.9 °F - 37.9 °F 66% 30.01 in 10.0 mi WNW 9.2 mph - N/A   Partly Cloudy
1:56 AM 48.9 °F - 35.1 °F 59% 30.01 in 10.0 mi NW 5.8 mph - N/A   Partly Cloudy
2:56 AM 48.0 °F - 30.9 °F 52% 30.01 in 10.0 mi WNW 9.2 mph - N/A   Partly Cloudy
3:56 AM 46.0 °F 41.4 °F 28.9 °F 51% 30.01 in 10.0 mi WNW 9.2 mph - N/A   Partly Cloudy
4:56 AM 48.0 °F - 30.9 °F 52% 30.01 in 10.0 mi NW 10.4 mph - N/A   Partly Cloudy
5:56 AM 46.9 °F - 28.9 °F 50% 30.03 in 10.0 mi NW 9.2 mph - N/A   Clear
6:56 AM 46.9 °F - 28.9 °F 50% 30.05 in 10.0 mi NW 9.2 mph - N/A   Partly Cloudy
7:56 AM 46.0 °F 42.5 °F 30.0 °F 54% 30.06 in 10.0 mi WNW 6.9 mph - N/A   Partly Cloudy
8:56 AM 48.0 °F - 30.9 °F 52% 30.07 in 10.0 mi WNW 10.4 mph - N/A   Partly Cloudy
9:56 AM 50.0 °F - 28.9 °F 44% 30.09 in 10.0 mi WNW 17.3 mph 24.2 mph N/A   Partly Cloudy
10:56 AM 52.0 °F - 30.0 °F 43% 30.09 in 10.0 mi WNW 16.1 mph - N/A   Scattered Clouds
11:56 AM 52.0 °F - 28.9 °F 41% 30.07 in 10.0 mi WNW 20.7 mph 28.8 mph N/A   Scattered Clouds
12:56 PM 52.0 °F - 33.1 °F 49% 30.06 in 10.0 mi WNW 23.0 mph 32.2 mph N/A   Scattered Clouds
1:56 PM 52.0 °F - 33.1 °F 49% 30.05 in 10.0 mi WNW 21.9 mph 31.1 mph N/A   Partly Cloudy
2:56 PM 52.0 °F - 33.1 °F 49% 30.06 in 10.0 mi WNW 26.5 mph 32.2 mph N/A   Partly Cloudy
3:56 PM 51.1 °F - 32.0 °F 48% 30.07 in 10.0 mi WNW 18.4 mph 26.5 mph N/A   Partly Cloudy
4:56 PM 50.0 °F - 34.0 °F 54% 30.08 in 10.0 mi WNW 19.6 mph 26.5 mph N/A   Partly Cloudy
5:56 PM 48.9 °F - 32.0 °F 52% 30.10 in 10.0 mi WNW 15.0 mph - N/A   Partly Cloudy
6:56 PM 48.0 °F - 32.0 °F 54% 30.13 in 10.0 mi WNW 13.8 mph - N/A   Clear
7:56 PM 46.0 °F 40.6 °F 30.0 °F 54% 30.15 in 10.0 mi West 11.5 mph - N/A   Clear
8:56 PM 46.0 °F 40.6 °F 30.9 °F 56% 30.17 in 10.0 mi West 11.5 mph - N/A   Clear
9:56 PM 46.0 °F 43.9 °F 30.0 °F 54% 30.18 in 10.0 mi NW 4.6 mph - N/A   Clear
10:56 PM 44.1 °F 40.1 °F 28.0 °F 53% 30.19 in 10.0 mi WNW 6.9 mph - N/A   Clear
11:56 PM 45.0 °F - 28.0 °F 52% 30.21 in 10.0 mi Calm Calm - N/A   Clear