San Francisco, CA

10:06 PM PST on January 17, 2017 (GMT -0800)
San Francisco International

Weather History for KSFO - December, 1999

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Thursday, December 9, 1999

  Actual Average Record
Temperature  
Mean Temperature 52 °F 51 °F  
Max Temperature 55 °F 57 °F 67 °F (1950)
Min Temperature 46 °F 45 °F 24 °F (1972)
Degree Days  
Heating Degree Days 14 14  
Month to date heating degree days 120  
Since 1 July heating degree days 684  
Cooling Degree Days 0 0  
Month to date cooling degree days 0  
Year to date cooling degree days 164  
Growing Degree Days 2 (Base 50)    
Moisture  
Dew Point 45 °F    
Average Humidity 80    
Maximum Humidity 96    
Minimum Humidity 57    
Precipitation  
Precipitation 0.29 in 0.12 in 1.17 in (1954)
Month to date precipitation 1.02  
Year to date precipitation 17.64  
Sea Level Pressure  
Sea Level Pressure 30.18 in    
Wind  
Wind Speed 8 mph (SSW)    
Max Wind Speed 16 mph    
Max Gust Speed 16 mph    
Visibility 10 miles    
Events Rain    
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. 09, 1999 Rise Set
Actual Time 7:12 AM PST 4:50 PM PST
Civil Twilight 6:43 AM PST 5:20 PM PST
Nautical Twilight 6:10 AM PST 5:52 PM PST
Astronomical Twilight 5:38 AM PST 6:24 PM PST
Moon 8:32 AM PST (12/9) 6:33 PM PST (12/9)
Length of Visible Light 10h 36m
Length of Day
9h 38m
Waxing Crescent, 3% of the Moon is Illuminated
Dec 9
Waxing Crescent
Dec 15
First Quarter
Dec 22
Full
Dec 29
Last Quarter
Jan 6
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 50.0 °F 35.1 °F 57% 30.17 in 10.0 mi Calm Calm - N/A   Overcast
1:56 AM 52.0 °F 41.0 °F 66% 30.17 in 10.0 mi SE 9.2 mph - N/A   Overcast
2:03 AM 51.8 °F 42.8 °F 71% 30.16 in 10.0 mi SE 8.1 mph - N/A   Overcast
2:31 AM 51.8 °F 44.6 °F 76% 30.15 in 10.0 mi SE 9.2 mph 16.1 mph N/A   Overcast
2:56 AM 52.0 °F 46.0 °F 80% 30.14 in 10.0 mi SSE 16.1 mph - N/A   Overcast
3:56 AM 50.0 °F 46.0 °F 86% 30.17 in 3.0 mi SW 11.5 mph - 0.08 in Rain Rain
4:03 AM 50.0 °F 46.4 °F 87% 30.17 in 4.0 mi WSW 10.4 mph - 0.04 in Rain Rain
4:56 AM 50.0 °F 48.0 °F 93% 30.14 in 10.0 mi East 13.8 mph - 0.15 in Rain Light Rain
5:56 AM 48.0 °F 46.9 °F 96% 30.17 in 10.0 mi SE 9.2 mph - 0.02 in   Overcast
6:56 AM 48.9 °F 46.9 °F 93% 30.17 in 10.0 mi Calm Calm - N/A   Mostly Cloudy
8:56 AM 51.1 °F 48.0 °F 89% 30.20 in 10.0 mi Calm Calm - N/A   Mostly Cloudy
9:32 AM 51.8 °F 48.2 °F 88% 30.22 in 10.0 mi East 5.8 mph - N/A   Mostly Cloudy
9:56 AM 52.0 °F 48.9 °F 89% 30.22 in 10.0 mi East 9.2 mph - N/A   Mostly Cloudy
10:22 AM 51.8 °F 48.2 °F 88% 30.22 in 10.0 mi East 8.1 mph - N/A   Mostly Cloudy
10:56 AM 53.1 °F 48.0 °F 83% 30.22 in 10.0 mi East 9.2 mph - N/A   Mostly Cloudy
11:56 AM 54.0 °F 46.9 °F 77% 30.19 in 10.0 mi Variable 5.8 mph - N/A   Mostly Cloudy
12:56 PM 55.0 °F 45.0 °F 69% 30.17 in 10.0 mi WSW 11.5 mph - N/A   Mostly Cloudy
1:56 PM 52.0 °F 46.0 °F 80% 30.16 in 10.0 mi SW 10.4 mph - 0.02 in   Mostly Cloudy
2:56 PM 54.0 °F 46.9 °F 77% 30.16 in 10.0 mi WSW 9.2 mph - N/A   Mostly Cloudy
3:56 PM 53.1 °F 46.9 °F 80% 30.16 in 10.0 mi SW 9.2 mph - N/A   Mostly Cloudy
4:56 PM 52.0 °F 45.0 °F 77% 30.16 in 10.0 mi WSW 10.4 mph - N/A   Mostly Cloudy
5:56 PM 51.1 °F 46.0 °F 83% 30.16 in 10.0 mi West 10.4 mph - 0.02 in   Overcast
6:56 PM 50.0 °F 45.0 °F 83% 30.17 in 10.0 mi WSW 10.4 mph - 0.00 in   Mostly Cloudy
7:56 PM 48.0 °F 43.0 °F 83% 30.17 in 10.0 mi West 11.5 mph - N/A   Mostly Cloudy
8:56 PM 48.9 °F 41.0 °F 74% 30.19 in 10.0 mi West 11.5 mph - N/A   Mostly Cloudy
9:56 PM 48.0 °F 39.9 °F 74% 30.19 in 10.0 mi West 12.7 mph - N/A   Mostly Cloudy
10:56 PM 48.0 °F 39.0 °F 71% 30.19 in 10.0 mi WNW 12.7 mph - N/A   Mostly Cloudy
11:56 PM 46.9 °F 37.0 °F 68% 30.20 in 10.0 mi NW 8.1 mph - N/A   Mostly Cloudy