San Francisco, CA

3:10 AM PST on February 10, 2016 (GMT -0800)
San Francisco International

Weather History for KSFO - January, 2009

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Saturday, January 31, 2009

  Actual Average Record
Temperature  
Mean Temperature 51 °F 51 °F  
Max Temperature 60 °F 58 °F 74 °F (2015)
Min Temperature 41 °F 45 °F 32 °F (1950)
Degree Days  
Heating Degree Days 14 14  
Month to date heating degree days 419 455  
Since 1 July heating degree days 1397 1467  
Cooling Degree Days 0 0  
Month to date cooling degree days 0 0  
Year to date cooling degree days 0 0  
Moisture  
Dew Point 45 °F    
Average Humidity 80    
Maximum Humidity 93    
Minimum Humidity 67    
Precipitation  
Precipitation 0.00 in 0.14 in 1.99 in (1963)
Month to date precipitation 0.69 4.19  
Year to date precipitation 0.69 4.19  
Since 1 July precipitation 5.70  
Sea Level Pressure  
Sea Level Pressure 30.16 in    
Wind  
Wind Speed 5 mph (West)    
Max Wind Speed 15 mph    
Max Gust Speed 17 mph    
Visibility 9 miles    
Events Fog    
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Daily Weather History Graph

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Date:

Astronomy

Jan. 31, 2009 Rise Set
Actual Time 7:13 AM PST 5:32 PM PST
Civil Twilight 6:46 AM PST 6:00 PM PST
Nautical Twilight 6:14 AM PST 6:31 PM PST
Astronomical Twilight 5:43 AM PST 7:02 PM PST
Moon 9:39 AM PST (1/31) 11:16 PM PST (1/31)
Length of Visible Light 11h 14m
Length of Day
10h 18m
Waxing Crescent, 28% of the Moon is Illuminated
Jan 31
Waxing Crescent
Feb 2
First Quarter
Feb 9
Full
Feb 16
Last Quarter
Feb 24
New

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 46.0 °F 40.2 °F 44.1 °F 93% 30.20 in 10.0 mi WNW 12.7 mph - N/A Fog Partly Cloudy
1:56 AM 45.0 °F 41.2 °F 43.0 °F 93% 30.20 in 10.0 mi WNW 6.9 mph - N/A Fog Partly Cloudy
2:56 AM 44.6 °F 42.2 °F 41.0 °F 87% 30.20 in 9.0 mi WNW 4.6 mph - N/A   Partly Cloudy
3:56 AM 44.1 °F 42.5 °F 41.0 °F 89% 30.19 in 10.0 mi SSW 3.5 mph - N/A   Partly Cloudy
4:56 AM 44.1 °F 41.5 °F 42.1 °F 93% 30.19 in 10.0 mi South 4.6 mph - N/A Fog Partly Cloudy
5:56 AM 44.1 °F 40.8 °F 43.0 °F 96% 30.18 in 10.0 mi SSE 5.8 mph - N/A   Clear
6:56 AM 45.0 °F - 42.1 °F 90% 30.18 in 10.0 mi Calm Calm - N/A   Clear
7:56 AM 46.0 °F - 43.0 °F 89% 30.19 in 6.0 mi Calm Calm - N/A   Partly Cloudy
8:56 AM 48.0 °F - 45.0 °F 89% 30.21 in 5.0 mi South 3.5 mph - N/A   Partly Cloudy
9:56 AM 51.1 °F - 46.0 °F 83% 30.22 in 5.0 mi Calm Calm - N/A   Haze
10:56 AM 52.0 °F - 46.9 °F 83% 30.22 in 5.0 mi Calm Calm - N/A   Haze
11:56 AM 53.1 °F - 46.9 °F 80% 30.19 in 6.0 mi NNE 5.8 mph - N/A   Haze
12:56 PM 53.1 °F - 46.9 °F 80% 30.16 in 7.0 mi East 4.6 mph - N/A   Clear
1:56 PM 55.0 °F - 48.9 °F 80% 30.13 in 8.0 mi NE 3.5 mph - N/A   Clear
2:56 PM 55.9 °F - 50.0 °F 80% 30.12 in 8.0 mi Calm Calm - N/A   Clear
3:56 PM 57.9 °F - 46.9 °F 67% 30.11 in 10.0 mi WNW 10.4 mph - N/A   Clear
4:56 PM 55.9 °F - 48.0 °F 75% 30.11 in 10.0 mi NW 8.1 mph - N/A   Clear
5:56 PM 53.1 °F - 46.9 °F 80% 30.11 in 10.0 mi WNW 11.5 mph - N/A   Clear
6:56 PM 51.1 °F - 46.0 °F 83% 30.12 in 10.0 mi West 6.9 mph - N/A   Clear
7:56 PM 51.1 °F - 46.0 °F 83% 30.12 in 10.0 mi WNW 8.1 mph - N/A   Partly Cloudy
8:56 PM 50.0 °F - 46.9 °F 89% 30.13 in 10.0 mi West 10.4 mph - N/A   Partly Cloudy
9:56 PM 48.9 °F - 46.0 °F 90% 30.14 in 10.0 mi West 4.6 mph - N/A   Partly Cloudy
10:56 PM 48.0 °F - 43.0 °F 83% 30.15 in 10.0 mi South 4.6 mph - N/A   Clear
11:56 PM 46.9 °F - 41.0 °F 80% 30.14 in 10.0 mi Calm Calm - N/A   Clear