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  
Since 1 July precipitation 4.56  
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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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