Weather History for San Francisco, CA

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Sunday, December 23, 2012

  Actual Average Record
Temperature  
Mean Temperature 56 °F 50 °F  
Max Temperature 61 °F 56 °F 64 °F (1990)
Min Temperature 51 °F 44 °F 28 °F (1990)
Degree Days  
Heating Degree Days 9 15  
Month to date heating degree days 270 325  
Since 1 July heating degree days 865 889  
Cooling Degree Days 0 0  
Month to date cooling degree days 0 0  
Year to date cooling degree days 86 164  
Growing Degree Days 5 (Base 50)    
Moisture  
Dew Point 51 °F    
Average Humidity 83    
Maximum Humidity 93    
Minimum Humidity 72    
Precipitation  
Precipitation 1.35 in 0.15 in 1.74 in (1959)
Month to date precipitation 4.86 2.89  
Year to date precipitation 20.08 19.51  
Since 1 July precipitation 9.62 6.43  
Sea Level Pressure  
Sea Level Pressure 29.95 in    
Wind  
Wind Speed 16 mph (SSW)    
Max Wind Speed 38 mph    
Max Gust Speed 47 mph    
Visibility 7 miles    
Events Rain    
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Date:

Astronomy

Dec. 23, 2012 Rise Set
Actual Time 7:21 AM PST 4:55 PM PST
Civil Twilight 6:52 AM PST 5:25 PM PST
Nautical Twilight 6:19 AM PST 5:58 PM PST
Astronomical Twilight 5:47 AM PST 6:30 PM PST
Moon 1:47 PM PST (12/23) 3:11 AM PST (12/23)
Length of Visible Light 10h 32m
Length of Day
9h 33m
Waxing Gibbous, 82% of the Moon is Illuminated
Dec 23
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 55.0 °F 46.0 °F 72% 30.07 in 10.0 mi South 11.5 mph - 0.00 in   Mostly Cloudy
1:56 AM 55.0 °F 46.9 °F 74% 30.06 in 10.0 mi South 12.7 mph - N/A   Scattered Clouds
2:56 AM 53.1 °F 46.0 °F 77% 30.05 in 10.0 mi ESE 8.1 mph - N/A   Mostly Cloudy
3:56 AM 54.0 °F 45.0 °F 72% 30.02 in 10.0 mi SSE 16.1 mph - 0.00 in Rain Light Rain
4:56 AM 52.0 °F 46.0 °F 80% 30.02 in 8.0 mi SE 10.4 mph - 0.02 in Rain Light Rain
5:56 AM 52.0 °F 46.0 °F 80% 30.01 in 10.0 mi SE 11.5 mph - 0.02 in Rain Light Rain
6:38 AM 51.8 °F 46.4 °F 82% 29.98 in 9.0 mi SE 15.0 mph - 0.02 in Rain Light Rain
6:56 AM 52.0 °F 46.0 °F 80% 29.99 in 9.0 mi SE 16.1 mph - 0.04 in Rain Rain
7:56 AM 55.0 °F 50.0 °F 83% 29.96 in 6.0 mi South 27.6 mph 35.7 mph 0.11 in Rain Light Rain
8:38 AM 55.4 °F 51.8 °F 88% 29.95 in 2.0 mi South 27.6 mph 43.7 mph 0.05 in Rain Heavy Rain
8:56 AM 55.0 °F 52.0 °F 89% 29.95 in 3.0 mi South 29.9 mph 38.0 mph 0.08 in Rain Rain
9:56 AM 55.9 °F 53.1 °F 90% 29.95 in 1.8 mi South 29.9 mph 46.0 mph 0.07 in Rain Light Rain
10:37 AM 55.4 °F 55.4 °F 100% 29.95 in 2.5 mi South 29.9 mph 46.0 mph 0.05 in   Overcast
10:56 AM 55.9 °F 55.0 °F 97% 29.94 in 2.0 mi South 29.9 mph 47.2 mph 0.07 in   Overcast
11:52 AM 55.4 °F 55.4 °F 100% 29.90 in 1.5 mi South 28.8 mph 43.7 mph 0.15 in Rain Heavy Rain
11:56 AM 57.0 °F 55.9 °F 96% 29.90 in 1.5 mi South 27.6 mph 43.7 mph 0.18 in Rain Heavy Rain
12:56 PM 57.0 °F 55.9 °F 96% 29.91 in 1.5 mi SSW 24.2 mph 35.7 mph 0.09 in Rain Light Rain
1:14 PM 57.2 °F 57.2 °F 100% 29.89 in 2.0 mi SSW 19.6 mph 31.1 mph 0.05 in Rain Light Rain
1:24 PM 57.2 °F 57.2 °F 100% 29.88 in 2.0 mi South 19.6 mph 27.6 mph 0.08 in Rain Light Rain
1:56 PM 57.9 °F 55.9 °F 93% 29.88 in 5.0 mi SW 19.6 mph 36.8 mph 0.22 in Rain Heavy Rain
2:56 PM 57.9 °F 55.6 °F 92% 29.88 in 10.0 mi SW 16.1 mph - 0.02 in   Mostly Cloudy
3:30 PM 57.2 °F 55.4 °F 94% 29.86 in 2.0 mi South 13.8 mph - 0.07 in Rain Rain
3:56 PM 57.9 °F 55.9 °F 93% 29.87 in 2.0 mi SW 9.2 mph - 0.17 in Rain Rain
4:17 PM 57.2 °F 55.4 °F 94% 29.86 in 3.0 mi SSW 10.4 mph 19.6 mph 0.19 in Rain Light Rain
4:56 PM 59.0 °F 55.0 °F 87% 29.86 in 6.0 mi SW 16.1 mph - 0.26 in Rain Light Rain
5:18 PM 59.0 °F 53.6 °F 82% 29.88 in 10.0 mi West 13.8 mph - 0.00 in   Overcast
5:46 PM 55.4 °F 51.8 °F 88% 29.88 in 9.0 mi West 11.5 mph - 0.00 in   Overcast
5:56 PM 55.0 °F 52.2 °F 90% 29.88 in 10.0 mi West 8.1 mph - 0.00 in   Overcast
6:26 PM 55.4 °F 51.8 °F 88% 29.90 in 10.0 mi WNW 5.8 mph - N/A   Overcast
6:56 PM 55.0 °F 51.3 °F 87% 29.91 in 10.0 mi WNW 10.4 mph - N/A   Overcast
7:56 PM 54.0 °F 48.9 °F 83% 29.94 in 10.0 mi WNW 6.9 mph - N/A   Mostly Cloudy
8:41 PM 53.6 °F 46.4 °F 77% 29.95 in 10.0 mi WNW 9.2 mph - N/A   Scattered Clouds
8:56 PM 53.1 °F 46.9 °F 80% 29.96 in 10.0 mi WNW 11.5 mph - N/A   Scattered Clouds
9:56 PM 52.0 °F 46.9 °F 83% 29.98 in 10.0 mi West 8.1 mph - N/A   Scattered Clouds
10:56 PM 52.0 °F 46.0 °F 80% 30.01 in 10.0 mi West 12.7 mph - N/A   Partly Cloudy
11:56 PM 52.0 °F 45.0 °F 77% 30.03 in 10.0 mi West 12.7 mph - N/A   Partly Cloudy