Weather History for San Francisco, CA

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Saturday, December 27, 1997

  Actual Average Record
Temperature  
Mean Temperature 45 °F 50 °F  
Max Temperature 53 °F 56 °F 70 °F (1953)
Min Temperature 37 °F 44 °F 33 °F (1954)
Degree Days  
Heating Degree Days 20 15  
Month to date heating degree days 385  
Since 1 July heating degree days 949  
Cooling Degree Days 0 0  
Month to date cooling degree days 0  
Year to date cooling degree days 164  
Moisture  
Dew Point 37 °F    
Average Humidity 75    
Maximum Humidity 89    
Minimum Humidity 54    
Precipitation  
Precipitation 0.00 in 0.14 in 2.24 in (2004)
Month to date precipitation 3.47  
Year to date precipitation 20.09  
Since 1 July precipitation 7.01  
Sea Level Pressure  
Sea Level Pressure 30.48 in    
Wind  
Wind Speed 2 mph (South)    
Max Wind Speed 6 mph    
Max Gust Speed -    
Visibility 8 miles    
Events      
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Date:

Astronomy

Dec. 27, 1997 Rise Set
Actual Time 7:23 AM PST 4:58 PM PST
Civil Twilight 6:54 AM PST 5:27 PM PST
Nautical Twilight 6:21 AM PST 6:00 PM PST
Astronomical Twilight 5:49 AM PST 6:32 PM PST
Moon 5:13 AM PST (12/27) 3:42 PM PST (12/27)
Length of Visible Light 10h 33m
Length of Day
9h 34m
Waning Crescent, 4% of the Moon is Illuminated
Dec 27
Waning Crescent
Dec 29
New
Jan 5
First Quarter
Jan 12
Full
Jan 20
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 44.1 °F - 35.1 °F 71% 30.53 in 10.0 mi Calm Calm - N/A   Partly Cloudy
1:56 AM 41.0 °F - 35.1 °F 79% 30.53 in 10.0 mi Calm Calm - N/A   Partly Cloudy
2:56 AM 41.0 °F 37.1 °F 36.0 °F 82% 30.53 in 10.0 mi SE 5.8 mph - N/A   Partly Cloudy
3:56 AM 37.0 °F 33.3 °F 34.0 °F 89% 30.52 in 10.0 mi South 4.6 mph - N/A   Clear
4:56 AM 42.1 °F - 35.1 °F 76% 30.51 in 10.0 mi Calm Calm - N/A   Clear
5:56 AM 37.0 °F 33.3 °F 34.0 °F 89% 30.51 in 10.0 mi South 4.6 mph - N/A   Clear
6:56 AM 37.9 °F 34.4 °F 34.0 °F 86% 30.52 in 10.0 mi South 4.6 mph - N/A   Clear
7:56 AM 42.1 °F - 36.0 °F 79% 30.54 in 9.0 mi Calm Calm - N/A   Partly Cloudy
8:56 AM 43.0 °F 41.3 °F 37.9 °F 82% 30.57 in 7.0 mi WNW 3.5 mph - N/A   Mostly Cloudy
9:56 AM 46.0 °F 43.9 °F 39.0 °F 76% 30.55 in 6.0 mi SE 4.6 mph - N/A   Haze
10:56 AM 46.9 °F - 39.0 °F 74% 30.53 in 5.0 mi Calm Calm - N/A   Haze
11:56 AM 48.0 °F - 39.9 °F 74% 30.51 in 5.0 mi Calm Calm - N/A   Haze
12:56 PM 48.9 °F - 39.0 °F 69% 30.47 in 6.0 mi Calm Calm - N/A   Haze
1:56 PM 48.9 °F - 41.0 °F 74% 30.45 in 6.0 mi East 3.5 mph - N/A   Haze
2:56 PM 50.0 °F - 41.0 °F 71% 30.43 in 8.0 mi Calm Calm - N/A   Partly Cloudy
3:56 PM 53.1 °F - 39.0 °F 59% 30.43 in 7.0 mi South 3.5 mph - N/A   Partly Cloudy
4:56 PM 52.0 °F - 36.0 °F 54% 30.42 in 9.0 mi Calm Calm - N/A   Clear
5:56 PM 48.0 °F - 39.9 °F 74% 30.42 in 8.0 mi South 3.5 mph - N/A   Clear
6:56 PM 46.0 °F 44.8 °F 37.9 °F 73% 30.42 in 10.0 mi SSE 3.5 mph - N/A   Clear
7:56 PM 46.9 °F - 37.0 °F 68% 30.42 in 9.0 mi Calm Calm - N/A   Clear
8:56 PM 46.0 °F 44.8 °F 37.0 °F 71% 30.42 in 8.0 mi West 3.5 mph - N/A   Clear
9:56 PM 46.0 °F - 37.0 °F 71% 30.41 in 8.0 mi Calm Calm - N/A   Clear
11:56 PM 44.1 °F 42.5 °F 37.9 °F 79% 30.40 in 8.0 mi South 3.5 mph - N/A   Clear