Weather History for San Francisco, CA

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Sunday, December 13, 1998

  Actual Average Record
Temperature  
Mean Temperature 54 °F 51 °F  
Max Temperature 62 °F 57 °F 69 °F (1958)
Min Temperature 46 °F 45 °F 30 °F (1972)
Degree Days  
Heating Degree Days 11 14  
Month to date heating degree days 176  
Since 1 July heating degree days 740  
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 89    
Maximum Humidity 100    
Minimum Humidity 65    
Precipitation  
Precipitation 0.20 in 0.12 in 2.47 in (2002)
Month to date precipitation 1.49  
Year to date precipitation 18.11  
Since 1 July precipitation 5.03  
Sea Level Pressure  
Sea Level Pressure 30.12 in    
Wind  
Wind Speed 8 mph (SW)    
Max Wind Speed 23 mph    
Max Gust Speed 34 mph    
Visibility 7 miles    
Events Rain    
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Date:

Astronomy

Dec. 13, 1998 Rise Set
Actual Time 7:15 AM PST 4:51 PM PST
Civil Twilight 6:46 AM PST 5:20 PM PST
Nautical Twilight 6:13 AM PST 5:53 PM PST
Astronomical Twilight 5:41 AM PST 6:25 PM PST
Moon 2:17 AM PST (12/13) 2:05 PM PST (12/13)
Length of Visible Light 10h 34m
Length of Day
9h 35m
Waning Crescent, 22% of the Moon is Illuminated
Dec 13
Waning Crescent
Dec 18
New
Dec 26
First Quarter
Jan 1
Full
Jan 9
Last Quarter

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 46.9 °F - 44.1 °F 90% 30.14 in 8.0 mi Calm Calm - N/A   Clear
1:56 AM 50.0 °F - 48.0 °F 93% 30.13 in 7.0 mi North 3.5 mph - N/A   Clear
2:56 AM 46.0 °F 42.5 °F 44.1 °F 93% 30.12 in 6.0 mi SW 6.9 mph - N/A   Clear
3:56 AM 46.0 °F 43.9 °F 45.0 °F 96% 30.12 in 5.0 mi WSW 4.6 mph - N/A   Mostly Cloudy
4:56 AM 50.0 °F - 46.9 °F 89% 30.11 in 6.0 mi South 3.5 mph - N/A   Overcast
5:56 AM 50.0 °F - 46.9 °F 89% 30.11 in 3.0 mi NNE 10.4 mph - N/A   Scattered Clouds
6:56 AM 48.9 °F - 46.0 °F 90% 30.11 in 3.0 mi Calm Calm - N/A   Mostly Cloudy
7:56 AM 48.0 °F - 46.0 °F 93% 30.11 in 2.5 mi ESE 4.6 mph - N/A   Mostly Cloudy
8:56 AM 48.9 °F - 46.9 °F 93% 30.12 in 3.0 mi SSW 4.6 mph - N/A   Mostly Cloudy
9:56 AM 51.1 °F - 48.0 °F 89% 30.11 in 4.0 mi NNE 5.8 mph - N/A   Mostly Cloudy
10:24 AM 55.4 °F - 48.2 °F 77% 30.12 in 8.0 mi SSE 6.9 mph - N/A   Mostly Cloudy
10:56 AM 57.0 °F - 50.0 °F 77% 30.11 in 10.0 mi South 6.9 mph - N/A   Mostly Cloudy
11:56 AM 57.0 °F - 51.1 °F 81% 30.08 in 10.0 mi SE 10.4 mph - N/A   Mostly Cloudy
12:17 PM 57.2 °F - 50.0 °F 77% 30.05 in 10.0 mi ESE 12.7 mph - N/A   Mostly Cloudy
12:56 PM 62.1 °F - 50.0 °F 65% 30.04 in 10.0 mi SE 23.0 mph 29.9 mph N/A   Mostly Cloudy
1:56 PM 57.9 °F - 52.0 °F 81% 30.03 in 9.0 mi South 21.9 mph 34.5 mph 0.00 in Rain Light Rain
2:00 PM 55.4 °F - 53.6 °F 94% 30.03 in 2.0 mi South 20.7 mph 34.5 mph 0.00 in Rain Light Rain
2:18 PM 53.6 °F - 51.8 °F 94% 30.07 in 1.8 mi SW 20.7 mph 28.8 mph 0.03 in Rain Light Rain
2:28 PM 53.6 °F - 51.8 °F 94% 30.08 in 2.5 mi WSW 18.4 mph 25.3 mph 0.05 in Rain Light Rain
2:49 PM 51.8 °F - 51.8 °F 100% 30.09 in 3.0 mi West 12.7 mph - 0.06 in Rain Light Rain
2:56 PM 51.1 °F - 51.1 °F 100% 30.09 in 3.0 mi West 15.0 mph - 0.08 in Rain Rain
3:04 PM 51.8 °F - 50.0 °F 94% 30.09 in 3.0 mi West 17.3 mph - 0.01 in Rain Rain
3:37 PM 51.8 °F - 50.0 °F 94% 30.09 in 6.0 mi SW 11.5 mph - 0.06 in Rain Light Rain
3:49 PM 51.8 °F - 48.2 °F 88% 30.09 in 6.0 mi SW 11.5 mph - 0.07 in Rain Light Rain
3:56 PM 51.1 °F - 48.9 °F 92% 30.09 in 6.0 mi SW 15.0 mph - 0.07 in Rain Light Rain
4:21 PM 50.0 °F - 48.2 °F 94% 30.12 in 5.0 mi West 16.1 mph 23.0 mph 0.02 in Rain Light Rain
4:56 PM 50.0 °F - 48.0 °F 93% 30.13 in 10.0 mi West 10.4 mph - 0.02 in   Mostly Cloudy
5:56 PM 50.0 °F - 45.0 °F 83% 30.15 in 10.0 mi West 11.5 mph - N/A   Mostly Cloudy
6:56 PM 50.0 °F - 45.0 °F 83% 30.17 in 10.0 mi West 8.1 mph - N/A   Mostly Cloudy
7:56 PM 50.0 °F - 46.0 °F 86% 30.19 in 10.0 mi West 11.5 mph - 0.00 in Rain Light Rain
8:24 PM 50.0 °F - 46.4 °F 87% 30.20 in 10.0 mi West 10.4 mph - 0.00 in Rain Light Rain
8:56 PM 50.0 °F - 46.9 °F 89% 30.20 in 10.0 mi WSW 8.1 mph - 0.00 in   Overcast
9:56 PM 50.0 °F - 46.9 °F 89% 30.22 in 9.0 mi West 16.1 mph - 0.00 in Rain Light Rain
10:56 PM 48.9 °F - 46.0 °F 90% 30.25 in 10.0 mi WSW 13.8 mph - 0.03 in   Mostly Cloudy
11:56 PM 50.0 °F - 45.0 °F 83% 30.26 in 10.0 mi West 15.0 mph - N/A   Mostly Cloudy