Weather History for KSFO - December, 2013

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Sunday, December 22, 2013

  Actual Average Record
Temperature  
Mean Temperature 54 °F 50 °F  
Max Temperature 65 °F 56 °F 68 °F (1999)
Min Temperature 43 °F 44 °F 27 °F (1990)
Degree Days  
Heating Degree Days 11 15  
Month to date heating degree days 350 310  
Since 1 July heating degree days 851 874  
Cooling Degree Days 0 0  
Month to date cooling degree days 0 0  
Year to date cooling degree days 164 164  
Growing Degree Days 4 (Base 50)    
Moisture  
Dew Point 42 °F    
Average Humidity 64    
Maximum Humidity 89    
Minimum Humidity 39    
Precipitation  
Precipitation 0.00 in 0.15 in 2.99 in (1955)
Month to date precipitation 0.35 2.74  
Year to date precipitation 3.38 19.36  
Since 1 July precipitation 1.49 6.28  
Sea Level Pressure  
Sea Level Pressure 30.21 in    
Wind  
Wind Speed 1 mph (NNW)    
Max Wind Speed 9 mph    
Max Gust Speed 10 mph    
Visibility 10 miles    
Events      
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Astronomy

Dec. 22, 2013 Rise Set
Actual Time 7:21 AM PST 4:55 PM PST
Civil Twilight 6:52 AM PST 5:24 PM PST
Nautical Twilight 6:19 AM PST 5:57 PM PST
Astronomical Twilight 5:47 AM PST 6:29 PM PST
Moon 10:07 PM PST (12/22) 10:25 AM PST (12/22)
Length of Visible Light 10h 32m
Length of Day
9h 33m
Waning Gibbous, 76% of the Moon is Illuminated
Dec 22
Waning Gibbous
Dec 25
Last Quarter
Jan 1
New
Jan 7
First Quarter
Jan 15
Full

Hourly Weather History & Observations

Time (PST) Temp. Dew Point Humidity Pressure Visibility Wind Dir Wind Speed Gust Speed Precip Events Conditions
12:56 AM 48.0 °F 43.0 °F 83% 30.10 in 10.0 mi NNW 3.5 mph - N/A   Clear
1:56 AM 46.9 °F 42.1 °F 83% 30.11 in 10.0 mi Calm Calm - N/A   Clear
2:56 AM 45.0 °F 41.0 °F 86% 30.13 in 10.0 mi Calm Calm - N/A   Partly Cloudy
3:56 AM 44.1 °F 41.0 °F 89% 30.14 in 10.0 mi Calm Calm - N/A   Partly Cloudy
4:56 AM 45.0 °F 39.9 °F 82% 30.15 in 10.0 mi Calm Calm - N/A   Partly Cloudy
5:56 AM 44.1 °F 39.9 °F 85% 30.16 in 10.0 mi Calm Calm - N/A   Partly Cloudy
6:56 AM 46.9 °F 42.1 °F 83% 30.18 in 10.0 mi Calm Calm - N/A   Partly Cloudy
7:56 AM 46.0 °F 42.1 °F 86% 30.20 in 10.0 mi Calm Calm - N/A   Partly Cloudy
8:56 AM 51.1 °F 46.0 °F 83% 30.22 in 10.0 mi Variable 3.5 mph - N/A   Partly Cloudy
9:56 AM 52.0 °F 46.0 °F 80% 30.24 in 10.0 mi Calm Calm - N/A   Partly Cloudy
10:56 AM 54.0 °F 46.9 °F 77% 30.25 in 10.0 mi North 3.5 mph - N/A   Partly Cloudy
11:56 AM 55.9 °F 44.1 °F 64% 30.23 in 10.0 mi Calm Calm - N/A   Partly Cloudy
12:56 PM 55.9 °F 46.0 °F 69% 30.21 in 10.0 mi Calm Calm - N/A   Partly Cloudy
1:56 PM 63.0 °F 39.0 °F 41% 30.20 in 10.0 mi Calm Calm - N/A   Partly Cloudy
2:56 PM 62.1 °F 42.1 °F 48% 30.20 in 10.0 mi Calm Calm - N/A   Partly Cloudy
3:56 PM 63.0 °F 37.9 °F 40% 30.22 in 10.0 mi NNW 3.5 mph - N/A   Partly Cloudy
4:56 PM 57.0 °F 42.1 °F 57% 30.22 in 10.0 mi North 3.5 mph - N/A   Partly Cloudy
5:56 PM 57.9 °F 39.9 °F 51% 30.24 in 10.0 mi West 8.1 mph - N/A   Clear
6:56 PM 57.9 °F 39.0 °F 49% 30.25 in 10.0 mi West 3.5 mph - N/A   Clear
7:56 PM 54.0 °F 39.0 °F 57% 30.27 in 10.0 mi Calm Calm - N/A   Clear
8:56 PM 53.1 °F 37.0 °F 55% 30.27 in 10.0 mi Calm Calm - N/A   Clear
9:56 PM 52.0 °F 42.1 °F 69% 30.27 in 10.0 mi East 4.6 mph - N/A   Clear
10:56 PM 51.1 °F 41.0 °F 68% 30.29 in 10.0 mi Calm Calm - N/A   Clear
11:56 PM 53.1 °F 41.0 °F 64% 30.29 in 10.0 mi Calm Calm - N/A   Partly Cloudy