Weather History for San Francisco, CA

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Friday, December 28, 2012

  Actual Average Record
Temperature  
Mean Temperature 46 °F 50 °F  
Max Temperature 50 °F 56 °F 71 °F (1967)
Min Temperature 41 °F 44 °F 32 °F (1966)
Degree Days  
Heating Degree Days 19 15  
Month to date heating degree days 347 400  
Since 1 July heating degree days 942 964  
Cooling Degree Days 0 0  
Month to date cooling degree days 0 0  
Year to date cooling degree days 86 164  
Moisture  
Dew Point 39 °F    
Average Humidity 75    
Maximum Humidity 89    
Minimum Humidity 61    
Precipitation  
Precipitation 0.17 in 0.14 in 1.46 in (1991)
Month to date precipitation 6.13 3.61  
Year to date precipitation 21.35 20.23  
Since 1 July precipitation 10.89 7.15  
Sea Level Pressure  
Sea Level Pressure 30.12 in    
Wind  
Wind Speed 5 mph (East)    
Max Wind Speed 13 mph    
Max Gust Speed 14 mph    
Visibility 10 miles    
Events Rain    
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Date:

Astronomy

Dec. 28, 2012 Rise Set
Actual Time 7:23 AM PST 4:59 PM PST
Civil Twilight 6:54 AM PST 5:28 PM PST
Nautical Twilight 6:21 AM PST 6:01 PM PST
Astronomical Twilight 5:49 AM PST 6:33 PM PST
Moon 5:39 PM PST (12/28) 7:22 AM PST (12/28)
Length of Visible Light 10h 33m
Length of Day
9h 35m
Full, 100% of the Moon is Illuminated
Dec 28
Full
Jan 4
Last Quarter
Jan 11
New
Jan 18
First Quarter
Jan 26
Full

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 46.9 °F - 41.0 °F 80% 30.18 in 10.0 mi South 4.6 mph - N/A   Mostly Cloudy
1:56 AM 45.0 °F - 39.0 °F 80% 30.19 in 10.0 mi Calm Calm - N/A   Mostly Cloudy
2:56 AM 44.1 °F 40.8 °F 39.0 °F 82% 30.19 in 10.0 mi SSE 5.8 mph - N/A   Mostly Cloudy
3:56 AM 45.0 °F 41.2 °F 37.9 °F 76% 30.17 in 10.0 mi ESE 6.9 mph - N/A   Mostly Cloudy
4:56 AM 43.0 °F - 39.0 °F 86% 30.16 in 10.0 mi Calm Calm - N/A   Mostly Cloudy
5:56 AM 41.0 °F - 37.0 °F 86% 30.17 in 10.0 mi Calm Calm - N/A   Mostly Cloudy
6:56 AM 44.1 °F - 39.0 °F 82% 30.17 in 10.0 mi Calm Calm - N/A   Mostly Cloudy
7:56 AM 44.1 °F 42.5 °F 39.0 °F 82% 30.17 in 10.0 mi SSE 3.5 mph - N/A   Mostly Cloudy
8:56 AM 45.0 °F - 39.0 °F 80% 30.18 in 10.0 mi Calm Calm - N/A   Mostly Cloudy
9:56 AM 46.0 °F 43.1 °F 37.9 °F 73% 30.18 in 10.0 mi SE 5.8 mph - N/A   Mostly Cloudy
10:56 AM 46.0 °F 42.5 °F 37.9 °F 73% 30.16 in 10.0 mi SE 6.9 mph - N/A   Mostly Cloudy
11:56 AM 46.9 °F - 39.0 °F 74% 30.13 in 10.0 mi SE 6.9 mph - N/A   Overcast
12:56 PM 48.0 °F - 37.9 °F 68% 30.11 in 10.0 mi East 4.6 mph - N/A   Overcast
1:56 PM 48.9 °F - 39.0 °F 69% 30.09 in 10.0 mi ENE 4.6 mph - N/A   Overcast
2:56 PM 50.0 °F - 37.4 °F 62% 30.09 in 10.0 mi East 4.6 mph - N/A   Mostly Cloudy
3:56 PM 50.0 °F - 37.0 °F 61% 30.08 in 10.0 mi NE 3.5 mph - N/A   Mostly Cloudy
4:56 PM 48.9 °F - 39.0 °F 69% 30.06 in 10.0 mi East 4.6 mph - N/A   Mostly Cloudy
5:56 PM 50.0 °F - 39.9 °F 68% 30.05 in 10.0 mi ENE 5.8 mph - N/A   Mostly Cloudy
6:56 PM 50.0 °F - 39.9 °F 68% 30.05 in 10.0 mi East 4.6 mph - N/A   Mostly Cloudy
7:56 PM 50.0 °F - 41.0 °F 71% 30.04 in 10.0 mi East 6.9 mph - N/A   Mostly Cloudy
8:56 PM 48.9 °F - 41.0 °F 74% 30.04 in 10.0 mi ENE 10.4 mph - 0.00 in Rain Light Rain
9:56 PM 48.0 °F - 39.9 °F 74% 30.04 in 9.0 mi ENE 10.4 mph - 0.02 in Rain Light Rain
10:56 PM 46.9 °F - 39.9 °F 77% 30.06 in 6.0 mi NNE 6.9 mph - 0.09 in Rain Rain
11:56 PM 46.9 °F - 39.9 °F 77% 30.05 in 6.0 mi NE 9.2 mph - 0.06 in Rain Light Rain