Weather History for San Francisco, CA

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Tuesday, December 14, 1999

  Actual Average Record
Temperature  
Mean Temperature 48 °F 51 °F  
Max Temperature 57 °F 57 °F 69 °F (1958)
Min Temperature 39 °F 45 °F 30 °F (1972)
Degree Days  
Heating Degree Days 17 14  
Month to date heating degree days 190  
Since 1 July heating degree days 754  
Cooling Degree Days 0 0  
Month to date cooling degree days 0  
Year to date cooling degree days 164  
Moisture  
Dew Point 39 °F    
Average Humidity 73    
Maximum Humidity 90    
Minimum Humidity 37    
Precipitation  
Precipitation 0.00 in 0.13 in 0.88 in (2002)
Month to date precipitation 1.62  
Year to date precipitation 18.24  
Since 1 July precipitation 5.16  
Sea Level Pressure  
Sea Level Pressure 30.36 in    
Wind  
Wind Speed 5 mph (WSW)    
Max Wind Speed 15 mph    
Max Gust Speed -    
Visibility 10 miles    
Events      
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Date:

Astronomy

Dec. 14, 1999 Rise Set
Actual Time 7:16 AM PST 4:51 PM PST
Civil Twilight 6:47 AM PST 5:21 PM PST
Nautical Twilight 6:14 AM PST 5:53 PM PST
Astronomical Twilight 5:42 AM PST 6:25 PM PST
Moon 11:56 AM PST (12/14) 11:12 PM PST (12/14)
Length of Visible Light 10h 33m
Length of Day
9h 35m
Waxing Crescent, 38% of the Moon is Illuminated
Dec 14
Waxing Crescent
Dec 15
First Quarter
Dec 22
Full
Dec 29
Last Quarter
Jan 6
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 43.0 °F 39.5 °F 37.9 °F 82% 30.33 in 10.0 mi SE 5.8 mph - N/A   Clear
1:56 AM 42.1 °F - 35.1 °F 76% 30.32 in 10.0 mi Calm Calm - N/A   Clear
2:56 AM 39.9 °F 36.7 °F 35.1 °F 83% 30.32 in 10.0 mi SW 4.6 mph - N/A   Clear
3:56 AM 39.9 °F 37.8 °F 36.0 °F 86% 30.33 in 10.0 mi SW 3.5 mph - N/A   Scattered Clouds
4:56 AM 42.1 °F 40.2 °F 37.0 °F 82% 30.33 in 10.0 mi Variable 3.5 mph - N/A   Scattered Clouds
5:56 AM 39.9 °F 37.8 °F 36.0 °F 86% 30.36 in 10.0 mi West 3.5 mph - N/A   Scattered Clouds
6:56 AM 44.1 °F - 37.0 °F 76% 30.35 in 10.0 mi Calm Calm - N/A   Mostly Cloudy
7:56 AM 45.0 °F 43.5 °F 37.9 °F 76% 30.36 in 10.0 mi South 3.5 mph - N/A   Mostly Cloudy
8:56 AM 50.0 °F - 36.0 °F 59% 30.38 in 9.0 mi Calm Calm - N/A   Mostly Cloudy
9:56 AM 51.1 °F - 37.0 °F 59% 30.40 in 10.0 mi East 3.5 mph - N/A   Scattered Clouds
10:56 AM 52.0 °F - 39.9 °F 63% 30.40 in 10.0 mi East 4.6 mph - N/A   Scattered Clouds
11:56 AM 52.0 °F - 37.0 °F 57% 30.39 in 10.0 mi NE 3.5 mph - N/A   Scattered Clouds
12:56 PM 53.1 °F - 37.9 °F 57% 30.37 in 10.0 mi North 3.5 mph - N/A   Partly Cloudy
1:56 PM 53.1 °F - 37.0 °F 55% 30.35 in 10.0 mi NE 3.5 mph - N/A   Partly Cloudy
2:56 PM 57.0 °F - 30.9 °F 37% 30.34 in 10.0 mi Calm Calm - N/A   Partly Cloudy
3:56 PM 55.9 °F - 37.0 °F 49% 30.33 in 10.0 mi Calm Calm - N/A   Scattered Clouds
4:56 PM 52.0 °F - 41.0 °F 66% 30.35 in 10.0 mi West 12.7 mph - N/A   Partly Cloudy
5:56 PM 51.1 °F - 45.0 °F 80% 30.35 in 10.0 mi West 12.7 mph - N/A   Clear
6:56 PM 50.0 °F - 46.0 °F 86% 30.35 in 10.0 mi West 11.5 mph - N/A   Clear
7:56 PM 50.0 °F - 45.0 °F 83% 30.37 in 10.0 mi West 15.0 mph - N/A   Clear
8:56 PM 50.0 °F - 45.0 °F 83% 30.38 in 10.0 mi West 15.0 mph - N/A   Clear
9:56 PM 48.0 °F - 43.0 °F 83% 30.38 in 10.0 mi West 8.1 mph - N/A   Clear
10:56 PM 48.9 °F - 45.0 °F 86% 30.39 in 10.0 mi West 9.2 mph - N/A   Clear
11:56 PM 46.9 °F - 44.1 °F 90% 30.38 in 10.0 mi West 3.5 mph - N/A   Clear