Weather History for KSFO - January, 2012

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Tuesday, January 31, 2012

  Actual Average Record
Temperature  
Mean Temperature 51 °F 51 °F  
Max Temperature 57 °F 58 °F 74 °F (2015)
Min Temperature 45 °F 45 °F 32 °F (1950)
Degree Days  
Heating Degree Days 14 14  
Month to date heating degree days 441 455  
Since 1 July heating degree days 1548 1467  
Cooling Degree Days 0 0  
Month to date cooling degree days 0 0  
Year to date cooling degree days 0 0  
Growing Degree Days 2 (Base 50)    
Moisture  
Dew Point 44 °F    
Average Humidity 77    
Maximum Humidity 86    
Minimum Humidity 67    
Precipitation  
Precipitation T in 0.14 in 1.99 in (1963)
Month to date precipitation 2.16 4.19  
Year to date precipitation 2.16 4.19  
Since 1 July precipitation 5.03 11.76  
Sea Level Pressure  
Sea Level Pressure 30.15 in    
Wind  
Wind Speed 8 mph (West)    
Max Wind Speed 20 mph    
Max Gust Speed 23 mph    
Visibility 10 miles    
Events      
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Astronomy

Jan. 31, 2012 Rise Set
Actual Time 7:14 AM PST 5:31 PM PST
Civil Twilight 6:46 AM PST 5:59 PM PST
Nautical Twilight 6:15 AM PST 6:30 PM PST
Astronomical Twilight 5:44 AM PST 7:01 PM PST
Moon 11:26 AM PST (1/31) 1:06 AM PST (1/31)
Length of Visible Light 11h 12m
Length of Day
10h 17m
First Quarter, 56% of the Moon is Illuminated
Jan 31
First Quarter
Feb 7
Full
Feb 14
Last Quarter
Feb 21
New
Feb 29
First Quarter

Hourly Weather History & Observations

Time (PST) Temp. Windchill Dew Point Humidity Pressure Visibility Wind Dir Wind Speed Gust Speed Precip Events Conditions
12:19 AM 50.0 °F - 46.4 °F 87% 30.10 in 9.0 mi West 13.8 mph - N/A   Overcast
12:56 AM 50.0 °F - 46.0 °F 86% 30.09 in 10.0 mi West 12.7 mph - N/A   Overcast
1:56 AM 50.0 °F - 46.0 °F 86% 30.10 in 10.0 mi West 9.2 mph - N/A   Overcast
2:56 AM 48.9 °F - 45.0 °F 86% 30.11 in 10.0 mi WNW 8.1 mph - N/A   Overcast
3:56 AM 48.0 °F - 45.0 °F 89% 30.11 in 10.0 mi West 6.9 mph - 0.00 in   Light Drizzle
4:56 AM 48.9 °F - 45.0 °F 86% 30.11 in 10.0 mi WNW 3.5 mph - 0.00 in   Light Drizzle
5:56 AM 48.9 °F - 44.1 °F 83% 30.10 in 10.0 mi South 3.5 mph - 0.00 in   Overcast
6:56 AM 48.9 °F - 44.1 °F 83% 30.11 in 10.0 mi SE 8.1 mph - N/A   Overcast
7:56 AM 48.9 °F - 43.0 °F 80% 30.13 in 10.0 mi SSE 4.6 mph - N/A   Overcast
8:56 AM 48.9 °F - 44.1 °F 83% 30.13 in 10.0 mi East 4.6 mph - N/A   Overcast
9:56 AM 50.0 °F - 44.1 °F 80% 30.15 in 10.0 mi SSE 3.5 mph - N/A   Overcast
10:56 AM 51.8 °F - 44.6 °F 76% 30.16 in 10.0 mi NNE 5.8 mph - N/A   Overcast
11:27 AM 51.8 °F - 44.6 °F 76% 30.16 in 10.0 mi North 3.5 mph - N/A   Mostly Cloudy
11:56 AM 53.1 °F - 45.0 °F 74% 30.15 in 10.0 mi NNE 4.6 mph - N/A   Mostly Cloudy
12:56 PM 54.0 °F - 46.0 °F 75% 30.13 in 10.0 mi NW 10.4 mph - N/A   Mostly Cloudy
1:56 PM 57.0 °F - 46.0 °F 67% 30.12 in 10.0 mi NW 8.1 mph - N/A   Mostly Cloudy
2:56 PM 53.1 °F - 46.0 °F 77% 30.12 in 10.0 mi WNW 15.0 mph - N/A   Mostly Cloudy
3:56 PM 51.1 °F - 44.1 °F 77% 30.14 in 10.0 mi West 13.8 mph - N/A   Overcast
4:56 PM 51.1 °F - 44.1 °F 77% 30.12 in 10.0 mi West 9.2 mph - N/A   Mostly Cloudy
5:56 PM 50.0 °F - 44.1 °F 80% 30.15 in 10.0 mi West 11.5 mph - N/A   Mostly Cloudy
6:56 PM 50.0 °F - 44.1 °F 80% 30.18 in 10.0 mi West 12.7 mph - N/A   Mostly Cloudy
7:08 PM 50.0 °F - 42.8 °F 76% 30.18 in 10.0 mi WSW 9.2 mph - N/A   Overcast
7:56 PM 51.1 °F - 42.1 °F 71% 30.20 in 10.0 mi West 12.7 mph - N/A   Overcast
8:34 PM 51.8 °F - 42.8 °F 71% 30.21 in 10.0 mi West 11.5 mph - N/A   Mostly Cloudy
8:56 PM 50.0 °F - 41.0 °F 71% 30.22 in 10.0 mi West 9.2 mph - N/A   Scattered Clouds
9:56 PM 48.9 °F - 41.0 °F 74% 30.19 in 10.0 mi SE 6.9 mph - N/A   Scattered Clouds
10:56 PM 46.9 °F - 41.0 °F 80% 30.21 in 10.0 mi SSW 4.6 mph - N/A   Partly Cloudy
11:56 PM 45.0 °F 41.2 °F 39.9 °F 82% 30.22 in 10.0 mi West 6.9 mph - N/A   Partly Cloudy