Weather History for KSFO - December, 2004

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Thursday, December 16, 2004

  Actual Average Record
Temperature  
Mean Temperature 54 °F 50 °F  
Max Temperature 62 °F 56 °F 70 °F (1998)
Min Temperature 46 °F 44 °F 33 °F (1965)
Degree Days  
Heating Degree Days 11 15  
Month to date heating degree days 220  
Since 1 July heating degree days 784  
Cooling Degree Days 0 0  
Month to date cooling degree days 0  
Year to date cooling degree days 164  
Growing Degree Days 4 (Base 50)    
Moisture  
Dew Point 48 °F    
Average Humidity 82    
Maximum Humidity 97    
Minimum Humidity 58    
Precipitation  
Precipitation 0.00 in 0.13 in 2.10 in (2002)
Month to date precipitation 1.88  
Year to date precipitation 18.50  
Since 1 July precipitation 5.42  
Sea Level Pressure  
Sea Level Pressure 30.34 in    
Wind  
Wind Speed 4 mph (ESE)    
Max Wind Speed 13 mph    
Max Gust Speed -    
Visibility 9 miles    
Events      
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Date:

Astronomy

Dec. 16, 2004 Rise Set
Actual Time 7:18 AM PST 4:52 PM PST
Civil Twilight 6:48 AM PST 5:21 PM PST
Nautical Twilight 6:16 AM PST 5:54 PM PST
Astronomical Twilight 5:44 AM PST 6:26 PM PST
Moon 11:35 AM PST (12/16) 10:27 PM PST (12/16)
Length of Visible Light 10h 33m
Length of Day
9h 34m
Waxing Crescent, 30% of the Moon is Illuminated
Dec 16
Waxing Crescent
Dec 18
First Quarter
Dec 26
Full
Jan 3
Last Quarter
Jan 10
New

Hourly Weather History & Observations

Time (PST) Temp. Dew Point Humidity Pressure Visibility Wind Dir Wind Speed Gust Speed Precip Events Conditions
12:56 AM 48.9 °F 46.0 °F 90% 30.29 in 10.0 mi Calm Calm - N/A   Clear
1:56 AM 48.0 °F 46.9 °F 96% 30.29 in 10.0 mi Calm Calm - N/A   Clear
2:56 AM 46.9 °F 46.0 °F 97% 30.30 in 10.0 mi Calm Calm - N/A   Clear
3:56 AM 50.0 °F 46.9 °F 89% 30.30 in 10.0 mi SE 4.6 mph - N/A   Clear
4:56 AM 50.0 °F 48.0 °F 93% 30.29 in 9.0 mi SSE 6.9 mph - N/A   Scattered Clouds
5:56 AM 54.0 °F 50.0 °F 86% 30.30 in 6.0 mi East 12.7 mph - N/A   Scattered Clouds
6:56 AM 48.9 °F 48.0 °F 97% 30.32 in 8.0 mi SSE 5.8 mph - N/A   Mostly Cloudy
7:56 AM 51.1 °F 48.9 °F 92% 30.34 in 8.0 mi ESE 6.9 mph - N/A   Mostly Cloudy
8:56 AM 53.1 °F 48.9 °F 86% 30.36 in 7.0 mi ESE 5.8 mph - N/A   Scattered Clouds
9:56 AM 54.0 °F 48.9 °F 83% 30.37 in 7.0 mi ESE 9.2 mph - N/A   Scattered Clouds
10:56 AM 55.9 °F 50.0 °F 80% 30.38 in 8.0 mi East 8.1 mph - N/A   Partly Cloudy
11:56 AM 57.9 °F 48.9 °F 72% 30.35 in 10.0 mi ESE 8.1 mph - N/A   Partly Cloudy
12:56 PM 60.1 °F 50.0 °F 69% 30.33 in 10.0 mi ESE 6.9 mph - N/A   Partly Cloudy
1:56 PM 60.1 °F 48.0 °F 64% 30.33 in 10.0 mi Calm Calm - N/A   Partly Cloudy
2:56 PM 62.1 °F 46.9 °F 58% 30.32 in 8.0 mi Calm Calm - N/A   Partly Cloudy
3:56 PM 61.0 °F 46.0 °F 58% 30.33 in 10.0 mi Calm Calm - N/A   Partly Cloudy
4:56 PM 57.9 °F 46.9 °F 67% 30.34 in 10.0 mi East 3.5 mph - N/A   Partly Cloudy
5:56 PM 55.9 °F 52.0 °F 87% 30.35 in 8.0 mi East 8.1 mph - N/A   Clear
6:56 PM 55.9 °F 50.0 °F 80% 30.37 in 9.0 mi East 6.9 mph - N/A   Clear
7:56 PM 54.0 °F 50.0 °F 86% 30.38 in 9.0 mi East 9.2 mph - N/A   Clear
8:56 PM 53.1 °F 50.0 °F 89% 30.39 in 8.0 mi East 4.6 mph - N/A   Clear
9:56 PM 50.0 °F 46.9 °F 89% 30.39 in 9.0 mi South 5.8 mph - N/A   Clear
10:56 PM 51.1 °F 46.9 °F 86% 30.40 in 9.0 mi SSE 5.8 mph - N/A   Clear
11:56 PM 53.1 °F 48.9 °F 86% 30.40 in 7.0 mi NE 9.2 mph - N/A   Clear