Weather History for San Francisco, CA

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Wednesday, December 19, 2012

  Actual Average Record
Temperature  
Mean Temperature 44 °F 50 °F  
Max Temperature 51 °F 56 °F 68 °F (1999)
Min Temperature 36 °F 44 °F 32 °F (1965)
Degree Days  
Heating Degree Days 21 15  
Month to date heating degree days 225 265  
Since 1 July heating degree days 820 829  
Cooling Degree Days 0 0  
Month to date cooling degree days 0 0  
Year to date cooling degree days 86 164  
Moisture  
Dew Point 29 °F    
Average Humidity 55    
Maximum Humidity 82    
Minimum Humidity 27    
Precipitation  
Precipitation 0.00 in 0.14 in 1.81 in (1952)
Month to date precipitation 2.62 2.29  
Year to date precipitation 17.84 18.91  
Since 1 July precipitation 7.38 5.83  
Sea Level Pressure  
Sea Level Pressure 30.26 in    
Wind  
Wind Speed 3 mph (SE)    
Max Wind Speed 9 mph    
Max Gust Speed 10 mph    
Visibility 10 miles    
Events      
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Date:

Astronomy

Dec. 19, 2012 Rise Set
Actual Time 7:20 AM PST 4:53 PM PST
Civil Twilight 6:50 AM PST 5:23 PM PST
Nautical Twilight 6:17 AM PST 5:56 PM PST
Astronomical Twilight 5:45 AM PST 6:28 PM PST
Moon 11:39 AM PST (12/19) No Moon Set
Length of Visible Light 10h 32m
Length of Day
9h 33m
Waxing Crescent, 46% of the Moon is Illuminated
Dec 19
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 45.0 °F - 25.0 °F 46% 30.21 in 10.0 mi Calm Calm - N/A   Clear
1:56 AM 39.9 °F 35.1 °F 28.0 °F 63% 30.22 in 10.0 mi WNW 6.9 mph - N/A   Clear
2:56 AM 39.0 °F 35.7 °F 28.0 °F 65% 30.23 in 10.0 mi West 4.6 mph - N/A   Clear
3:56 AM 37.9 °F - 28.0 °F 68% 30.23 in 10.0 mi Calm Calm - N/A   Clear
4:56 AM 37.9 °F - 28.0 °F 68% 30.25 in 10.0 mi Calm Calm - N/A   Clear
5:56 AM 37.0 °F - 28.0 °F 70% 30.27 in 10.0 mi Calm Calm - N/A   Clear
6:56 AM 37.0 °F - 28.0 °F 70% 30.29 in 10.0 mi Calm Calm - N/A   Clear
7:56 AM 37.9 °F 35.5 °F 32.0 °F 79% 30.30 in 10.0 mi South 3.5 mph - N/A   Partly Cloudy
8:56 AM 43.0 °F 41.3 °F 32.0 °F 65% 30.32 in 10.0 mi SSE 3.5 mph - N/A   Partly Cloudy
9:56 AM 45.0 °F 42.6 °F 32.0 °F 60% 30.32 in 10.0 mi ESE 4.6 mph - N/A   Mostly Cloudy
10:56 AM 48.0 °F - 33.1 °F 56% 30.32 in 10.0 mi Calm Calm - N/A   Scattered Clouds
11:56 AM 48.0 °F - 34.0 °F 58% 30.31 in 10.0 mi ENE 5.8 mph - N/A   Partly Cloudy
12:56 PM 48.9 °F - 33.1 °F 54% 30.29 in 10.0 mi ENE 3.5 mph - N/A   Partly Cloudy
1:56 PM 50.0 °F - 28.0 °F 43% 30.28 in 10.0 mi East 4.6 mph - N/A   Partly Cloudy
2:56 PM 51.1 °F - 28.9 °F 43% 30.27 in 10.0 mi East 3.5 mph - N/A   Partly Cloudy
3:56 PM 50.0 °F - 27.0 °F 41% 30.25 in 10.0 mi ESE 3.5 mph - N/A   Partly Cloudy
4:56 PM 50.0 °F - 18.0 °F 28% 30.25 in 10.0 mi SSE 3.5 mph - N/A   Partly Cloudy
5:56 PM 48.0 °F - 27.0 °F 44% 30.24 in 10.0 mi South 5.8 mph - N/A   Clear
6:56 PM 46.9 °F - 28.0 °F 48% 30.24 in 10.0 mi SSE 5.8 mph - N/A   Clear
7:56 PM 46.0 °F 44.8 °F 28.0 °F 50% 30.24 in 10.0 mi SW 3.5 mph - N/A   Clear
8:56 PM 46.0 °F - 28.9 °F 51% 30.24 in 10.0 mi Calm Calm - N/A   Clear
9:56 PM 44.1 °F 42.5 °F 34.0 °F 68% 30.24 in 10.0 mi South 3.5 mph - N/A   Clear
10:56 PM 44.1 °F 40.8 °F 32.0 °F 63% 30.24 in 10.0 mi SE 5.8 mph - N/A   Clear
11:56 PM 43.0 °F 39.5 °F 30.9 °F 62% 30.23 in 10.0 mi SE 5.8 mph - N/A   Clear