Weather History for San Francisco, CA

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Saturday, December 22, 2012

  Actual Average Record
Temperature  
Mean Temperature 55 °F 50 °F  
Max Temperature 59 °F 56 °F 68 °F (1999)
Min Temperature 50 °F 44 °F 27 °F (1990)
Degree Days  
Heating Degree Days 10 15  
Month to date heating degree days 261 310  
Since 1 July heating degree days 856 874  
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 47 °F    
Average Humidity 79    
Maximum Humidity 96    
Minimum Humidity 62    
Precipitation  
Precipitation 0.57 in 0.15 in 2.99 in (1955)
Month to date precipitation 3.51 2.74  
Year to date precipitation 18.73 19.36  
Since 1 July precipitation 8.27 6.28  
Sea Level Pressure  
Sea Level Pressure 29.95 in    
Wind  
Wind Speed 15 mph (SSW)    
Max Wind Speed 32 mph    
Max Gust Speed 52 mph    
Visibility 8 miles    
Events Rain    
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Date:

Astronomy

Dec. 22, 2012 Rise Set
Actual Time 7:21 AM PST 4:55 PM PST
Civil Twilight 6:52 AM PST 5:24 PM PST
Nautical Twilight 6:19 AM PST 5:57 PM PST
Astronomical Twilight 5:47 AM PST 6:29 PM PST
Moon 1:12 PM PST (12/22) 2:15 AM PST (12/22)
Length of Visible Light 10h 32m
Length of Day
9h 33m
Waxing Gibbous, 74% of the Moon is Illuminated
Dec 22
Waxing Gibbous
Dec 28
Full
Jan 4
Last Quarter
Jan 11
New
Jan 18
First Quarter

Hourly Weather History & Observations

Time (PST) Temp. Dew Point Humidity Pressure Visibility Wind Dir Wind Speed Gust Speed Precip Events Conditions
12:56 AM 57.0 °F 48.9 °F 74% 29.86 in 10.0 mi South 21.9 mph 34.5 mph 0.00 in   Mostly Cloudy
1:56 AM 57.0 °F 48.9 °F 74% 29.86 in 10.0 mi South 25.3 mph 32.2 mph 0.02 in   Overcast
2:56 AM 57.9 °F 48.9 °F 72% 29.85 in 10.0 mi South 28.8 mph 36.8 mph 0.00 in   Overcast
3:56 AM 55.9 °F 48.0 °F 75% 29.84 in 4.0 mi South 24.2 mph 36.8 mph 0.04 in Rain Heavy Rain
4:56 AM 55.0 °F 51.1 °F 86% 29.85 in 8.0 mi South 20.7 mph 33.4 mph 0.11 in Rain Rain
5:16 AM 53.6 °F 51.8 °F 94% 29.85 in 4.0 mi SSW 20.7 mph 29.9 mph 0.07 in Rain Heavy Rain
5:32 AM 53.6 °F 50.0 °F 88% 29.86 in 4.0 mi SW 21.9 mph 31.1 mph 0.12 in Rain Heavy Rain
5:56 AM 54.0 °F 50.0 °F 86% 29.87 in 6.0 mi SW 18.4 mph 29.9 mph 0.18 in Rain Rain
6:56 AM 50.0 °F 46.9 °F 89% 29.90 in 6.0 mi SW 16.1 mph - 0.12 in Rain Light Rain
7:56 AM 51.1 °F 48.0 °F 89% 29.91 in 9.0 mi SW 6.9 mph - 0.01 in Rain Light Rain
8:56 AM 52.0 °F 50.0 °F 93% 29.93 in 9.0 mi SSW 6.9 mph - 0.01 in Rain Light Rain
9:56 AM 54.0 °F 51.1 °F 90% 29.96 in 10.0 mi SSW 11.5 mph - 0.00 in Rain Light Rain
10:56 AM 55.9 °F 46.9 °F 72% 29.97 in 10.0 mi WSW 9.2 mph - 0.00 in   Mostly Cloudy
11:56 AM 57.0 °F 45.0 °F 64% 29.96 in 10.0 mi SSW 17.3 mph 24.2 mph 0.00 in   Scattered Clouds
12:56 PM 57.9 °F 44.1 °F 60% 29.96 in 10.0 mi SSW 15.0 mph 23.0 mph N/A   Mostly Cloudy
1:56 PM 57.0 °F 45.0 °F 64% 29.96 in 10.0 mi SSW 18.4 mph - N/A   Mostly Cloudy
2:56 PM 55.9 °F 46.0 °F 69% 29.96 in 9.0 mi SSW 17.3 mph - 0.00 in Rain Light Rain
3:43 PM 51.8 °F 44.6 °F 76% 29.98 in 4.0 mi WSW 19.6 mph 28.8 mph 0.03 in Rain Heavy Rain
3:56 PM 53.1 °F 45.0 °F 74% 29.99 in 6.0 mi West 17.3 mph - 0.05 in Rain Light Rain
4:56 PM 54.0 °F 45.0 °F 72% 29.99 in 10.0 mi SW 5.8 mph - 0.03 in   Mostly Cloudy
5:56 PM 55.9 °F 46.0 °F 69% 30.00 in 10.0 mi SSW 11.5 mph - N/A   Mostly Cloudy
6:56 PM 55.9 °F 46.0 °F 69% 30.02 in 10.0 mi SSW 11.5 mph - N/A   Mostly Cloudy
7:56 PM 55.0 °F 46.0 °F 72% 30.04 in 10.0 mi SSW 10.4 mph - N/A   Mostly Cloudy
8:56 PM 55.0 °F 46.0 °F 72% 30.05 in 10.0 mi South 15.0 mph - 0.00 in   Overcast
9:56 PM 54.0 °F 45.0 °F 72% 30.07 in 10.0 mi South 8.1 mph - N/A   Mostly Cloudy
10:56 PM 53.1 °F 46.0 °F 77% 30.08 in 10.0 mi South 10.4 mph - 0.00 in Rain Light Rain
11:56 PM 54.0 °F 46.9 °F 77% 30.08 in 10.0 mi South 12.7 mph 27.6 mph 0.00 in Rain Light Rain