Weather History for San Francisco, CA

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Sunday, December 16, 2012

  Actual Average Record
Temperature  
Mean Temperature 52 °F 50 °F  
Max Temperature 57 °F 56 °F 70 °F (1998)
Min Temperature 47 °F 44 °F 33 °F (1965)
Degree Days  
Heating Degree Days 13 15  
Month to date heating degree days 178 220  
Since 1 July heating degree days 773 784  
Cooling Degree Days 0 0  
Month to date cooling degree days 0 0  
Year to date cooling degree days 86 164  
Growing Degree Days 2 (Base 50)    
Moisture  
Dew Point 45 °F    
Average Humidity 79    
Maximum Humidity 86    
Minimum Humidity 71    
Precipitation  
Precipitation 0.01 in 0.13 in 2.10 in (2002)
Month to date precipitation 2.47 1.88  
Year to date precipitation 17.69 18.50  
Since 1 July precipitation 7.23 5.42  
Sea Level Pressure  
Sea Level Pressure 30.06 in    
Wind  
Wind Speed 6 mph (SE)    
Max Wind Speed 16 mph    
Max Gust Speed 23 mph    
Visibility 10 miles    
Events Rain    
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Date:

Astronomy

Dec. 16, 2012 Rise Set
Actual Time 7:18 AM PST 4:52 PM PST
Civil Twilight 6:48 AM PST 5:21 PM PST
Nautical Twilight 6:16 AM PST 5:54 PM PST
Astronomical Twilight 5:44 AM PST 6:26 PM PST
Moon 9:58 AM PST (12/16) 9:09 PM PST (12/16)
Length of Visible Light 10h 33m
Length of Day
9h 34m
Waxing Crescent, 17% of the Moon is Illuminated
Dec 16
Waxing Crescent
Dec 19
First Quarter
Dec 28
Full
Jan 4
Last Quarter
Jan 11
New

Hourly Weather History & Observations

Time (PST) Temp. Dew Point Humidity Pressure Visibility Wind Dir Wind Speed Gust Speed Precip Events Conditions
12:52 AM 48.2 °F 41.0 °F 76% 30.05 in 10.0 mi ESE 6.9 mph - N/A   Overcast
12:56 AM 48.2 °F 41.0 °F 76% 30.04 in 10.0 mi ESE 6.9 mph - N/A   Overcast
1:56 AM 48.9 °F 41.0 °F 74% 30.07 in 10.0 mi SE 6.9 mph - N/A   Overcast
2:56 AM 48.0 °F 41.0 °F 77% 30.06 in 10.0 mi SE 8.1 mph - N/A   Overcast
3:56 AM 48.0 °F 41.0 °F 77% 30.05 in 10.0 mi SE 4.6 mph - N/A   Overcast
4:56 AM 48.0 °F 41.0 °F 77% 30.06 in 10.0 mi Calm Calm - N/A   Overcast
5:56 AM 48.0 °F 42.1 °F 80% 30.08 in 10.0 mi SW 3.5 mph - N/A   Overcast
6:56 AM 46.9 °F 42.1 °F 83% 30.08 in 10.0 mi Calm Calm - N/A   Mostly Cloudy
7:43 AM 48.2 °F 42.8 °F 82% 30.07 in 10.0 mi SSE 5.8 mph - N/A   Mostly Cloudy
7:56 AM 48.0 °F 42.1 °F 80% 30.08 in 10.0 mi South 3.5 mph - N/A   Mostly Cloudy
8:56 AM 48.9 °F 43.0 °F 80% 30.10 in 10.0 mi South 3.5 mph - N/A   Mostly Cloudy
9:56 AM 50.0 °F 43.0 °F 77% 30.11 in 10.0 mi Calm Calm - N/A   Overcast
10:36 AM 51.8 °F 42.8 °F 71% 30.11 in 10.0 mi ESE 3.5 mph - N/A   Overcast
10:56 AM 51.1 °F 44.1 °F 77% 30.11 in 10.0 mi East 4.6 mph - N/A   Overcast
11:56 AM 52.0 °F 44.1 °F 74% 30.09 in 10.0 mi ENE 3.5 mph - N/A   Overcast
12:56 PM 53.1 °F 45.0 °F 74% 30.07 in 10.0 mi East 4.6 mph - N/A   Overcast
1:25 PM 53.6 °F 44.6 °F 72% 30.07 in 9.0 mi Calm Calm - N/A   Overcast
1:56 PM 53.1 °F 48.9 °F 86% 30.05 in 3.0 mi ESE 6.9 mph - N/A   Overcast
2:56 PM 54.0 °F 48.9 °F 83% 30.04 in 10.0 mi East 4.6 mph - N/A   Overcast
3:56 PM 54.0 °F 48.0 °F 80% 30.04 in 10.0 mi Calm Calm - N/A   Overcast
4:56 PM 55.0 °F 51.1 °F 86% 30.04 in 9.0 mi SE 8.1 mph - N/A   Overcast
5:56 PM 55.9 °F 51.1 °F 84% 30.04 in 10.0 mi SSE 6.9 mph 16.1 mph N/A   Overcast
6:56 PM 55.9 °F 51.1 °F 84% 30.04 in 9.0 mi South 9.2 mph - 0.00 in Rain Light Rain
7:56 PM 55.9 °F 51.1 °F 84% 30.04 in 10.0 mi South 12.7 mph - 0.01 in   Overcast
8:56 PM 55.9 °F 51.1 °F 84% 30.05 in 10.0 mi South 8.1 mph - 0.00 in   Overcast
9:56 PM 55.9 °F 48.9 °F 77% 30.05 in 10.0 mi South 9.2 mph - N/A   Mostly Cloudy
10:56 PM 55.9 °F 48.9 °F 77% 30.04 in 10.0 mi SSE 11.5 mph - N/A   Mostly Cloudy
11:56 PM 55.0 °F 50.0 °F 83% 30.03 in 6.0 mi SSE 13.8 mph 21.9 mph 0.00 in Rain Light Rain