Weather History for San Francisco, CA

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Tuesday, January 12, 2010

  Actual Average Record
Temperature  
Mean Temperature 58 °F 50 °F  
Max Temperature 62 °F 56 °F 70 °F (2009)
Min Temperature 53 °F 44 °F 32 °F (1963)
Degree Days  
Heating Degree Days 7 15  
Month to date heating degree days 160 180  
Since 1 July heating degree days 1154 1190  
Cooling Degree Days 0 0  
Month to date cooling degree days 0 0  
Year to date cooling degree days 0 0  
Growing Degree Days 8 (Base 50)    
Moisture  
Dew Point 53 °F    
Average Humidity 86    
Maximum Humidity 93    
Minimum Humidity 78    
Precipitation  
Precipitation 0.35 in 0.14 in 1.56 in (1993)
Month to date precipitation 0.35 1.68  
Year to date precipitation 0.35 1.68  
Since 1 July precipitation 6.85 9.25  
Sea Level Pressure  
Sea Level Pressure 30.00 in    
Wind  
Wind Speed 12 mph (SE)    
Max Wind Speed 29 mph    
Max Gust Speed 37 mph    
Visibility 9 miles    
Events Rain    
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Date:

Astronomy

Jan. 12, 2010 Rise Set
Actual Time 7:24 AM PST 5:11 PM PST
Civil Twilight 6:55 AM PST 5:40 PM PST
Nautical Twilight 6:23 AM PST 6:13 PM PST
Astronomical Twilight 5:51 AM PST 6:44 PM PST
Moon 5:35 AM PST (1/12) 2:59 PM PST (1/12)
Length of Visible Light 10h 45m
Length of Day
9h 47m
Waning Crescent, 6% of the Moon is Illuminated
Jan 12
Waning Crescent
Jan 14
New
Jan 23
First Quarter
Jan 29
Full
Feb 5
Last 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 48.0 °F 77% 30.04 in 7.0 mi South 9.2 mph - 0.00 in Rain Light Rain
1:56 AM 54.0 °F 51.1 °F 90% 30.01 in 5.0 mi ESE 12.7 mph - 0.08 in Rain Rain
2:41 AM 53.6 °F 51.8 °F 94% 29.98 in 9.0 mi ESE 18.4 mph - 0.08 in Rain Light Rain
2:56 AM 53.1 °F 51.1 °F 93% 29.98 in 10.0 mi ESE 23.0 mph 27.6 mph 0.08 in Rain Light Rain
3:24 AM 53.6 °F 51.8 °F 94% 29.99 in 10.0 mi ESE 15.0 mph - 0.00 in Rain Light Rain
3:56 AM 54.0 °F 51.1 °F 90% 30.01 in 10.0 mi East 13.8 mph - 0.00 in   Overcast
4:56 AM 55.0 °F 52.0 °F 89% 30.01 in 10.0 mi South 15.0 mph 23.0 mph 0.03 in Rain Light Rain
5:16 AM 57.2 °F 53.6 °F 88% 30.00 in 10.0 mi South 13.8 mph 26.5 mph 0.00 in   Overcast
5:56 AM 54.0 °F 52.0 °F 93% 30.02 in 9.0 mi SSE 8.1 mph - 0.00 in Rain Light Rain
6:56 AM 55.0 °F 52.0 °F 89% 30.03 in 9.0 mi East 11.5 mph - 0.01 in   Overcast
7:56 AM 57.0 °F 53.1 °F 87% 30.04 in 9.0 mi SSE 11.5 mph 18.4 mph 0.00 in   Overcast
8:56 AM 57.9 °F 53.1 °F 84% 30.06 in 10.0 mi SSE 11.5 mph - N/A   Overcast
9:56 AM 55.9 °F 53.1 °F 90% 30.07 in 10.0 mi SE 11.5 mph - N/A   Overcast
10:56 AM 55.0 °F 51.1 °F 86% 30.08 in 10.0 mi East 10.4 mph - N/A   Overcast
11:56 AM 55.0 °F 52.0 °F 89% 30.06 in 10.0 mi East 8.1 mph - N/A   Overcast
12:56 PM 62.1 °F 55.9 °F 80% 30.03 in 10.0 mi SSE 6.9 mph - N/A   Mostly Cloudy
1:56 PM 61.0 °F 55.0 °F 81% 30.01 in 10.0 mi SSE 9.2 mph - N/A   Overcast
2:56 PM 61.0 °F 54.0 °F 78% 30.00 in 10.0 mi South 15.0 mph 23.0 mph N/A   Mostly Cloudy
3:56 PM 61.0 °F 54.0 °F 78% 30.00 in 10.0 mi SSE 12.7 mph - N/A   Overcast
4:56 PM 59.0 °F 54.0 °F 83% 29.99 in 10.0 mi SSE 4.6 mph - N/A   Overcast
5:39 PM 59.0 °F 55.4 °F 88% 29.98 in 8.0 mi South 5.8 mph - 0.01 in Rain Light Rain
5:56 PM 59.0 °F 55.0 °F 87% 29.99 in 9.0 mi South 4.6 mph - 0.02 in Rain Light Rain
6:56 PM 57.9 °F 55.9 °F 93% 29.97 in 10.0 mi South 4.6 mph - 0.00 in   Overcast
7:56 PM 59.0 °F 55.0 °F 87% 29.96 in 10.0 mi SE 9.2 mph - 0.00 in Rain Light Rain
8:15 PM 57.2 °F 55.4 °F 94% 29.96 in 10.0 mi SE 10.4 mph - 0.01 in Rain Light Rain
8:56 PM 60.1 °F 55.9 °F 86% 29.96 in 10.0 mi South 16.1 mph 24.2 mph 0.01 in   Mostly Cloudy
9:56 PM 60.1 °F 55.0 °F 83% 29.92 in 10.0 mi SE 12.7 mph 19.6 mph 0.00 in Rain Light Rain
10:56 PM 60.1 °F 55.9 °F 86% 29.91 in 10.0 mi South 23.0 mph 28.8 mph 0.00 in Rain Light Rain
11:56 PM 59.0 °F 55.9 °F 90% 29.87 in 9.0 mi South 21.9 mph - 0.12 in Rain Light Rain