San Francisco, CA

4:20 AM PST on November 21, 2017 (GMT -0800)
San Francisco International

Weather History for KSFO - December, 1999

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Saturday, December 4, 1999

  Actual Average Record
Temperature  
Mean Temperature 50 °F 52 °F  
Max Temperature 55 °F 58 °F 75 °F (1958)
Min Temperature 44 °F 46 °F 36 °F (2004)
Degree Days  
Heating Degree Days 16 13  
Month to date heating degree days 52  
Since 1 July heating degree days 616  
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 62    
Maximum Humidity 80    
Minimum Humidity 50    
Precipitation  
Precipitation 0.00 in 0.11 in 1.56 in (1945)
Month to date precipitation 0.43  
Year to date precipitation 17.05  
Sea Level Pressure  
Sea Level Pressure 30.25 in    
Wind  
Wind Speed 6 mph (East)    
Max Wind Speed 14 mph    
Max Gust Speed 17 mph    
Visibility 10 miles    
Events      
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

Dec. 04, 1999 Rise Set
Actual Time 7:08 AM PST 4:50 PM PST
Civil Twilight 6:39 AM PST 5:19 PM PST
Nautical Twilight 6:06 AM PST 5:52 PM PST
Astronomical Twilight 5:35 AM PST 6:24 PM PST
Moon 3:58 AM PST (12/4) 3:21 PM PST (12/4)
Length of Visible Light 10h 40m
Length of Day
9h 42m
Waning Crescent, 9% of the Moon is Illuminated
Dec 4
Waning Crescent
Dec 7
New
Dec 15
First Quarter
Dec 22
Full
Dec 29
Last Quarter

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 34.0 °F 56% 30.22 in 10.0 mi SE 6.9 mph 17.3 mph N/A   Clear
1:56 AM 50.0 °F 33.1 °F 52% 30.21 in 10.0 mi SE 6.9 mph - N/A   Clear
2:56 AM 52.0 °F 34.0 °F 50% 30.22 in 10.0 mi NE 12.7 mph - N/A   Clear
3:56 AM 51.1 °F 35.1 °F 54% 30.23 in 10.0 mi NNE 8.1 mph - N/A   Clear
4:56 AM 44.1 °F 36.0 °F 73% 30.23 in 10.0 mi Calm Calm - N/A   Clear
5:56 AM 50.0 °F 35.1 °F 57% 30.22 in 10.0 mi NNE 13.8 mph - N/A   Clear
6:56 AM 51.1 °F 36.0 °F 56% 30.23 in 10.0 mi ENE 12.7 mph - N/A   Partly Cloudy
7:56 AM 51.1 °F 34.0 °F 52% 30.25 in 10.0 mi NE 9.2 mph - N/A   Partly Cloudy
8:56 AM 52.0 °F 36.0 °F 54% 30.25 in 10.0 mi NE 13.8 mph - N/A   Scattered Clouds
9:56 AM 52.0 °F 35.1 °F 53% 30.26 in 10.0 mi East 6.9 mph - N/A   Scattered Clouds
11:56 AM 53.1 °F 36.0 °F 52% 30.25 in 10.0 mi Calm Calm - N/A   Scattered Clouds
12:56 PM 54.0 °F 37.0 °F 53% 30.24 in 10.0 mi Calm Calm - N/A   Partly Cloudy
1:56 PM 55.0 °F 39.9 °F 57% 30.24 in 10.0 mi Calm Calm - N/A   Partly Cloudy
2:56 PM 55.9 °F 44.1 °F 64% 30.23 in 10.0 mi ENE 3.5 mph - N/A   Partly Cloudy
3:56 PM 55.0 °F 45.0 °F 69% 30.23 in 10.0 mi Calm Calm - N/A   Mostly Cloudy
4:56 PM 54.0 °F 46.9 °F 77% 30.24 in 10.0 mi Calm Calm - N/A   Scattered Clouds
5:56 PM 53.1 °F 43.0 °F 69% 30.26 in 10.0 mi Calm Calm - N/A   Mostly Cloudy
6:56 PM 53.1 °F 42.1 °F 66% 30.27 in 10.0 mi Calm Calm - N/A   Mostly Cloudy
7:56 PM 52.0 °F 41.0 °F 66% 30.27 in 10.0 mi South 3.5 mph - N/A   Mostly Cloudy
8:56 PM 51.1 °F 39.9 °F 66% 30.28 in 10.0 mi Calm Calm - N/A   Mostly Cloudy
9:56 PM 50.0 °F 42.1 °F 74% 30.28 in 10.0 mi SSE 4.6 mph - N/A   Mostly Cloudy
10:56 PM 50.0 °F 42.1 °F 74% 30.28 in 10.0 mi SE 4.6 mph - N/A   Overcast
11:56 PM 46.9 °F 41.0 °F 80% 30.29 in 10.0 mi West 5.8 mph - N/A   Mostly Cloudy