San Francisco, CA

10:10 AM PST on December 15, 2017 (GMT -0800)
San Francisco International

Weather History for KSFO - January, 2011

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Friday, January 28, 2011

  Actual Average Record
Temperature  
Mean Temperature 50 °F 51 °F  
Max Temperature 53 °F 57 °F 69 °F (1984)
Min Temperature 46 °F 45 °F 33 °F (1975)
Degree Days  
Heating Degree Days 15 14  
Month to date heating degree days 400 413  
Since 1 July heating degree days 1306 1423  
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 86    
Maximum Humidity 100    
Minimum Humidity 71    
Precipitation  
Precipitation 0.00 in 0.13 in 1.04 in (1981)
Month to date precipitation 0.63 3.78  
Year to date precipitation 0.63 3.78  
Since 1 July precipitation 9.89  
Sea Level Pressure  
Sea Level Pressure 30.14 in    
Wind  
Wind Speed 7 mph (West)    
Max Wind Speed 15 mph    
Max Gust Speed 17 mph    
Visibility 6 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. 28, 2011 Rise Set
Actual Time 7:16 AM PST 5:28 PM PST
Civil Twilight 6:48 AM PST 5:56 PM PST
Nautical Twilight 6:17 AM PST 6:28 PM PST
Astronomical Twilight 5:46 AM PST 6:59 PM PST
Moon 2:56 AM PST (1/28) 12:40 PM PST (1/28)
Length of Visible Light 11h 08m
Length of Day
10h 12m
Waning Crescent, 26% of the Moon is Illuminated
Jan 28
Waning Crescent
Feb 2
New
Feb 10
First Quarter
Feb 18
Full
Feb 24
Last Quarter

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 50.0 °F - 46.0 °F 86% 30.17 in 10.0 mi WNW 5.8 mph - N/A   Clear
1:28 AM 48.2 °F - 46.4 °F 93% 30.16 in 8.0 mi WNW 4.6 mph - N/A   Partly Cloudy
1:56 AM 46.4 °F 42.4 °F 44.6 °F 93% 30.16 in 6.0 mi West 8.1 mph - N/A   Partly Cloudy
2:03 AM 46.4 °F 41.9 °F 44.6 °F 93% 30.17 in 0.5 mi West 9.2 mph - N/A Fog Fog
2:21 AM 48.2 °F - 46.4 °F 93% 30.17 in 1.0 mi WNW 8.1 mph - N/A   Mist
2:56 AM 48.0 °F - 46.0 °F 93% 30.17 in 1.5 mi West 10.4 mph - N/A   Mostly Cloudy
3:05 AM 48.2 °F - 46.4 °F 93% 30.17 in 3.0 mi West 9.2 mph - N/A   Overcast
3:56 AM 48.9 °F - 46.9 °F 93% 30.16 in 5.0 mi West 6.9 mph - N/A   Overcast
4:56 AM 48.0 °F - 46.0 °F 93% 30.15 in 7.0 mi SSE 5.8 mph - N/A   Overcast
5:06 AM 48.2 °F - 46.4 °F 93% 30.15 in 2.5 mi South 4.6 mph - N/A   Overcast
5:10 AM 48.2 °F - 46.4 °F 93% 30.15 in 1.0 mi South 3.5 mph - N/A   Overcast
5:17 AM 46.4 °F 44.3 °F 46.4 °F 100% 30.15 in 0.5 mi SW 4.6 mph - N/A Fog Fog
5:56 AM 46.9 °F - 46.0 °F 97% 30.16 in 0.8 mi SW 3.5 mph - N/A   Overcast
6:09 AM 46.4 °F - 46.4 °F 100% 30.16 in 2.5 mi Calm Calm - N/A   Overcast
6:17 AM 46.4 °F 45.2 °F 46.4 °F 100% 30.15 in 4.0 mi West 3.5 mph - N/A   Overcast
6:56 AM 46.4 °F - 44.6 °F 93% 30.16 in 3.0 mi Calm Calm - N/A   Overcast
7:56 AM 48.0 °F - 45.0 °F 89% 30.17 in 3.0 mi NNW 3.5 mph - N/A   Overcast
8:56 AM 48.0 °F - 46.0 °F 93% 30.17 in 2.0 mi NNE 10.4 mph - N/A   Overcast
9:56 AM 48.9 °F - 46.0 °F 90% 30.19 in 2.5 mi NNE 6.9 mph - N/A   Overcast
10:56 AM 48.9 °F - 46.0 °F 90% 30.19 in 3.0 mi Calm Calm - N/A   Overcast
11:56 AM 50.0 °F - 45.0 °F 83% 30.16 in 4.0 mi NNE 4.6 mph - N/A   Haze
12:56 PM 50.0 °F - 46.0 °F 86% 30.13 in 3.0 mi West 10.4 mph - N/A   Overcast
1:29 PM 51.8 °F - 44.6 °F 76% 30.12 in 5.0 mi WNW 11.5 mph - N/A   Haze
1:56 PM 52.0 °F - 45.0 °F 77% 30.12 in 8.0 mi WNW 11.5 mph - N/A   Mostly Cloudy
2:56 PM 53.1 °F - 45.0 °F 74% 30.11 in 8.0 mi WNW 10.4 mph - N/A   Mostly Cloudy
3:12 PM 53.6 °F - 44.6 °F 72% 30.10 in 8.0 mi WNW 11.5 mph - N/A   Mostly Cloudy
3:56 PM 52.0 °F - 44.1 °F 74% 30.10 in 8.0 mi West 10.4 mph - N/A   Mostly Cloudy
4:56 PM 51.1 °F - 44.1 °F 77% 30.09 in 8.0 mi West 12.7 mph - N/A   Mostly Cloudy
5:56 PM 50.0 °F - 44.1 °F 80% 30.09 in 9.0 mi West 9.2 mph - N/A   Mostly Cloudy
6:56 PM 50.0 °F - 43.0 °F 77% 30.09 in 10.0 mi West 9.2 mph - N/A   Overcast
7:56 PM 50.0 °F - 43.0 °F 77% 30.10 in 10.0 mi WSW 6.9 mph - N/A   Overcast
8:56 PM 50.0 °F - 43.0 °F 77% 30.11 in 10.0 mi WSW 9.2 mph - N/A   Overcast
9:56 PM 50.0 °F - 44.1 °F 80% 30.11 in 10.0 mi WSW 5.8 mph - N/A   Overcast
10:52 PM 50.0 °F - 44.6 °F 82% 30.11 in 10.0 mi West 8.1 mph - N/A   Overcast
10:56 PM 50.0 °F - 45.0 °F 83% 30.11 in 10.0 mi West 6.9 mph - N/A   Overcast
11:56 PM 50.0 °F - 44.1 °F 80% 30.11 in 10.0 mi Variable 3.5 mph - N/A   Overcast