Weather History for San Francisco, CA

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Thursday, December 20, 2012

  Actual Average Record
Temperature  
Mean Temperature 49 °F 50 °F  
Max Temperature 60 °F 56 °F 69 °F (1999)
Min Temperature 37 °F 44 °F 31 °F (1965)
Degree Days  
Heating Degree Days 16 15  
Month to date heating degree days 241 280  
Since 1 July heating degree days 836 844  
Cooling Degree Days 0 0  
Month to date cooling degree days 0 0  
Year to date cooling degree days 86 164  
Moisture  
Dew Point 36 °F    
Average Humidity 62    
Maximum Humidity 79    
Minimum Humidity 44    
Precipitation  
Precipitation 0.00 in 0.15 in 0.91 in (1970)
Month to date precipitation 2.62 2.44  
Year to date precipitation 17.84 19.06  
Since 1 July precipitation 7.38 5.98  
Sea Level Pressure  
Sea Level Pressure 30.10 in    
Wind  
Wind Speed 13 mph (SSE)    
Max Wind Speed 30 mph    
Max Gust Speed 39 mph    
Visibility 10 miles    
Events      
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Date:

Astronomy

Dec. 20, 2012 Rise Set
Actual Time 7:20 AM PST 4:54 PM PST
Civil Twilight 6:51 AM PST 5:23 PM PST
Nautical Twilight 6:18 AM PST 5:56 PM PST
Astronomical Twilight 5:46 AM PST 6:28 PM PST
Moon 12:09 PM PST (12/20) 12:18 AM PST (12/20)
Length of Visible Light 10h 32m
Length of Day
9h 33m
First Quarter, 56% of the Moon is Illuminated
Dec 20
First Quarter
Dec 28
Full
Jan 4
Last Quarter
Jan 11
New
Jan 18
First 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 42.1 °F 40.2 °F 33.1 °F 70% 30.22 in 10.0 mi SSE 3.5 mph - N/A   Clear
1:56 AM 39.0 °F 36.8 °F 30.9 °F 73% 30.21 in 10.0 mi SSE 3.5 mph - N/A   Clear
2:56 AM 41.0 °F 35.8 °F 33.1 °F 73% 30.20 in 10.0 mi ESE 8.1 mph - N/A   Clear
3:56 AM 37.0 °F 32.4 °F 30.0 °F 76% 30.20 in 10.0 mi WNW 5.8 mph - N/A   Clear
4:56 AM 39.9 °F 37.8 °F 30.0 °F 68% 30.19 in 10.0 mi ESE 3.5 mph - N/A   Partly Cloudy
5:56 AM 39.9 °F 37.8 °F 33.1 °F 77% 30.19 in 10.0 mi ESE 3.5 mph - N/A   Partly Cloudy
6:56 AM 39.0 °F - 33.1 °F 79% 30.19 in 10.0 mi Calm Calm - N/A   Partly Cloudy
7:56 AM 42.1 °F 40.2 °F 32.0 °F 67% 30.19 in 10.0 mi SW 3.5 mph - N/A   Mostly Cloudy
8:56 AM 46.9 °F - 34.0 °F 61% 30.18 in 10.0 mi SE 6.9 mph - N/A   Mostly Cloudy
9:56 AM 51.1 °F - 35.1 °F 54% 30.17 in 10.0 mi ESE 15.0 mph - N/A   Mostly Cloudy
10:56 AM 54.0 °F - 36.0 °F 51% 30.14 in 10.0 mi SE 13.8 mph - N/A   Scattered Clouds
11:56 AM 57.9 °F - 37.9 °F 47% 30.09 in 10.0 mi SSE 15.0 mph 23.0 mph N/A   Mostly Cloudy
12:56 PM 59.0 °F - 39.0 °F 48% 30.06 in 10.0 mi SSE 18.4 mph 27.6 mph N/A   Scattered Clouds
1:56 PM 60.1 °F - 39.0 °F 46% 30.04 in 10.0 mi South 24.2 mph 29.9 mph N/A   Mostly Cloudy
2:56 PM 59.0 °F - 37.9 °F 46% 30.02 in 10.0 mi South 23.0 mph 35.7 mph N/A   Mostly Cloudy
3:56 PM 57.9 °F - 39.0 °F 49% 30.02 in 10.0 mi South 27.6 mph 32.2 mph N/A   Scattered Clouds
4:56 PM 55.9 °F - 37.9 °F 51% 30.02 in 10.0 mi South 21.9 mph 32.2 mph N/A   Mostly Cloudy
5:56 PM 55.0 °F - 37.9 °F 53% 30.02 in 10.0 mi South 18.4 mph - N/A   Mostly Cloudy
6:56 PM 55.0 °F - 37.9 °F 53% 30.03 in 10.0 mi South 21.9 mph - N/A   Mostly Cloudy
7:56 PM 55.0 °F - 39.0 °F 55% 30.03 in 10.0 mi South 16.1 mph 25.3 mph N/A   Mostly Cloudy
8:56 PM 54.0 °F - 39.0 °F 57% 30.03 in 10.0 mi South 19.6 mph - N/A   Partly Cloudy
9:56 PM 54.0 °F - 39.9 °F 59% 30.02 in 10.0 mi South 13.8 mph - N/A   Scattered Clouds
10:56 PM 53.1 °F - 39.9 °F 61% 30.02 in 10.0 mi SSE 13.8 mph - N/A   Scattered Clouds
11:56 PM 53.1 °F - 41.0 °F 64% 30.00 in 10.0 mi SE 15.0 mph - N/A   Mostly Cloudy