Weather History for San Francisco, CA

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Monday, December 17, 2012

  Actual Average Record
Temperature  
Mean Temperature 55 °F 50 °F  
Max Temperature 59 °F 56 °F 67 °F (1958)
Min Temperature 50 °F 44 °F 30 °F (1965)
Degree Days  
Heating Degree Days 10 15  
Month to date heating degree days 188 235  
Since 1 July heating degree days 783 799  
Cooling Degree Days 0 0  
Month to date cooling degree days 0 0  
Year to date cooling degree days 86 164  
Growing Degree Days 4 (Base 50)    
Moisture  
Dew Point 48 °F    
Average Humidity 78    
Maximum Humidity 93    
Minimum Humidity 63    
Precipitation  
Precipitation 0.15 in 0.13 in 1.26 in (2005)
Month to date precipitation 2.62 2.01  
Year to date precipitation 17.84 18.63  
Since 1 July precipitation 7.38 5.55  
Sea Level Pressure  
Sea Level Pressure 30.02 in    
Wind  
Wind Speed 12 mph (WSW)    
Max Wind Speed 21 mph    
Max Gust Speed 26 mph    
Visibility 8 miles    
Events Rain    
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Date:

Astronomy

Dec. 17, 2012 Rise Set
Actual Time 7:18 AM PST 4:53 PM PST
Civil Twilight 6:49 AM PST 5:22 PM PST
Nautical Twilight 6:16 AM PST 5:55 PM PST
Astronomical Twilight 5:44 AM PST 6:27 PM PST
Moon 10:35 AM PST (12/17) 10:15 PM PST (12/17)
Length of Visible Light 10h 32m
Length of Day
9h 34m
Waxing Crescent, 26% of the Moon is Illuminated
Dec 17
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
12:56 AM 55.9 °F 51.1 °F 84% 30.02 in 7.0 mi South 17.3 mph - 0.00 in Rain Light Rain
1:56 AM 55.9 °F 51.1 °F 84% 30.02 in 4.0 mi South 13.8 mph - 0.01 in Rain Light Rain
2:56 AM 57.0 °F 51.1 °F 81% 30.03 in 6.0 mi South 15.0 mph 26.5 mph 0.03 in Rain Light Rain
3:56 AM 55.0 °F 52.0 °F 89% 30.01 in 3.0 mi SSE 6.9 mph - 0.01 in Rain Light Rain
4:56 AM 55.9 °F 53.1 °F 90% 30.01 in 8.0 mi SSE 5.8 mph - 0.03 in Rain Light Rain
5:56 AM 57.0 °F 53.1 °F 87% 30.02 in 10.0 mi Variable 5.8 mph - 0.00 in Rain Light Rain
6:56 AM 57.9 °F 53.1 °F 84% 30.02 in 10.0 mi SSW 8.1 mph - 0.01 in   Overcast
7:56 AM 57.9 °F 53.1 °F 84% 30.03 in 10.0 mi SSW 8.1 mph - 0.00 in   Overcast
8:12 AM 57.2 °F 53.6 °F 88% 30.04 in 1.0 mi West 16.1 mph 19.6 mph 0.00 in Rain Light Rain
8:31 AM 55.4 °F 51.8 °F 88% 30.05 in 1.0 mi WNW 12.7 mph - 0.03 in Rain Light Rain
8:56 AM 54.0 °F 50.0 °F 86% 30.07 in 2.0 mi West 9.2 mph - 0.04 in Rain Light Rain
9:56 AM 55.0 °F 50.0 °F 83% 30.08 in 8.0 mi West 6.9 mph - 0.01 in   Overcast
10:56 AM 57.0 °F 50.0 °F 77% 30.06 in 8.0 mi West 6.9 mph - N/A   Overcast
11:56 AM 59.0 °F 50.0 °F 72% 30.05 in 8.0 mi West 10.4 mph - N/A   Mostly Cloudy
12:56 PM 57.9 °F 48.9 °F 72% 30.03 in 7.0 mi WNW 16.1 mph - 0.00 in Rain Rain
1:56 PM 57.0 °F 48.9 °F 74% 30.01 in 9.0 mi West 15.0 mph - 0.01 in   Overcast
4:56 PM 54.0 °F 45.0 °F 72% 29.99 in 10.0 mi West 15.0 mph - N/A   Mostly Cloudy
5:56 PM 54.0 °F 42.1 °F 64% 30.00 in 10.0 mi West 15.0 mph - N/A   Mostly Cloudy
6:56 PM 52.0 °F 41.0 °F 66% 30.01 in 10.0 mi West 13.8 mph - N/A   Scattered Clouds
7:56 PM 52.0 °F 41.0 °F 66% 30.01 in 10.0 mi West 11.5 mph - N/A   Scattered Clouds
8:56 PM 52.0 °F 41.0 °F 66% 30.01 in 10.0 mi West 9.2 mph - N/A   Scattered Clouds
9:56 PM 51.1 °F 39.9 °F 66% 30.01 in 10.0 mi West 16.1 mph - N/A   Partly Cloudy
10:56 PM 50.0 °F 41.0 °F 71% 30.01 in 10.0 mi WNW 15.0 mph - N/A   Partly Cloudy
11:56 PM 50.0 °F 39.0 °F 66% 30.01 in 10.0 mi WNW 12.7 mph - N/A   Partly Cloudy