Weather History for San Francisco, CA

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Saturday, January 23, 1999

  Actual Average Record
Temperature  
Mean Temperature 50 °F 51 °F  
Max Temperature 55 °F 57 °F 71 °F (1948)
Min Temperature 44 °F 45 °F 31 °F (1949)
Degree Days  
Heating Degree Days 16 14  
Month to date heating degree days 343  
Since 1 July heating degree days 1353  
Cooling Degree Days 0 0  
Month to date cooling degree days 0  
Year to date cooling degree days 0  
Moisture  
Dew Point 43 °F    
Average Humidity 82    
Maximum Humidity 97    
Minimum Humidity 65    
Precipitation  
Precipitation 0.33 in 0.13 in 1.30 in (2000)
Month to date precipitation 3.13  
Year to date precipitation 3.13  
Since 1 July precipitation 10.70  
Sea Level Pressure  
Sea Level Pressure 30.05 in    
Wind  
Wind Speed 13 mph (West)    
Max Wind Speed 20 mph    
Max Gust Speed 24 mph    
Visibility 9 miles    
Events Rain    
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Date:

Astronomy

Jan. 23, 1999 Rise Set
Actual Time 7:19 AM PST 5:23 PM PST
Civil Twilight 6:51 AM PST 5:51 PM PST
Nautical Twilight 6:19 AM PST 6:23 PM PST
Astronomical Twilight 5:48 AM PST 6:54 PM PST
Moon 11:09 AM PST No Moon Set
Length of Visible Light 10h 59m
Length of Day
10h 03m
Waxing Crescent, 39% of the Moon is Illuminated
Jan 23
Waxing Crescent
Jan 24
First Quarter
Jan 31
Full
Feb 8
Last Quarter
Feb 15
New

Hourly Weather History & Observations

Time (PST) Temp. Windchill Dew Point Humidity Pressure Visibility Wind Dir Wind Speed Gust Speed Precip Events Conditions
12:37 AM 55.4 °F - 53.6 °F 94% 30.01 in 3.0 mi South 17.3 mph 24.2 mph 0.05 in Rain Rain
12:47 AM 55.4 °F - 53.6 °F 94% 30.02 in 2.5 mi WSW 19.6 mph 24.2 mph 0.10 in Rain Heavy Rain
12:56 AM 52.0 °F - 51.1 °F 97% 30.02 in 3.0 mi West 17.3 mph - 0.15 in Rain Heavy Rain
1:56 AM 52.0 °F - 50.0 °F 93% 30.02 in 6.0 mi West 8.1 mph - 0.07 in Rain Light Rain
2:56 AM 51.1 °F - 48.9 °F 92% 30.02 in 5.0 mi West 10.4 mph - 0.01 in Rain Light Rain
3:56 AM 50.0 °F - 48.0 °F 93% 30.02 in 5.0 mi West 13.8 mph - 0.04 in Rain Rain
4:56 AM 50.0 °F - 46.9 °F 89% 30.02 in 10.0 mi West 11.5 mph 21.9 mph 0.00 in Rain Light Rain
5:56 AM 48.0 °F - 46.0 °F 93% 30.03 in 10.0 mi West 9.2 mph - 0.01 in Rain Light Rain
6:56 AM 48.9 °F - 46.0 °F 90% 30.04 in 10.0 mi WSW 8.1 mph - 0.01 in Rain Light Rain
7:26 AM 48.2 °F - 46.4 °F 93% 30.05 in 9.0 mi West 8.1 mph - 0.00 in Rain Light Rain
7:56 AM 48.0 °F - 46.0 °F 93% 30.06 in 10.0 mi West 9.2 mph - 0.01 in   Overcast
8:56 AM 48.9 °F - 45.0 °F 86% 30.07 in 10.0 mi West 6.9 mph - 0.00 in Rain Light Rain
9:17 AM 48.2 °F - 44.6 °F 87% 30.08 in 10.0 mi West 12.7 mph - 0.00 in Rain Light Rain
9:56 AM 48.9 °F - 43.0 °F 80% 30.09 in 10.0 mi WSW 10.4 mph - 0.01 in Rain Light Rain
10:56 AM 48.9 °F - 45.0 °F 86% 30.10 in 10.0 mi West 12.7 mph - 0.01 in Rain Light Rain
11:56 AM 50.0 °F - 42.1 °F 74% 30.09 in 10.0 mi West 8.1 mph - 0.01 in Rain Light Rain
12:56 PM 51.1 °F - 44.1 °F 77% 30.05 in 10.0 mi West 6.9 mph - 0.00 in   Mostly Cloudy
1:56 PM 51.1 °F - 43.0 °F 74% 30.04 in 10.0 mi WSW 6.9 mph - N/A   Mostly Cloudy
2:56 PM 52.0 °F - 43.0 °F 71% 30.03 in 10.0 mi West 12.7 mph - N/A   Mostly Cloudy
3:56 PM 50.0 °F - 42.1 °F 74% 30.04 in 10.0 mi West 13.8 mph - N/A   Mostly Cloudy
4:56 PM 48.0 °F - 39.9 °F 74% 30.05 in 10.0 mi West 16.1 mph - N/A   Scattered Clouds
5:56 PM 46.9 °F - 39.0 °F 74% 30.05 in 10.0 mi West 11.5 mph - N/A   Scattered Clouds
6:56 PM 46.9 °F - 36.0 °F 66% 30.06 in 10.0 mi WSW 15.0 mph - N/A   Scattered Clouds
7:56 PM 45.0 °F 39.7 °F 35.1 °F 68% 30.06 in 10.0 mi West 10.4 mph - N/A   Scattered Clouds
8:56 PM 45.0 °F 38.9 °F 34.0 °F 65% 30.06 in 10.0 mi WSW 12.7 mph - N/A   Partly Cloudy
9:56 PM 44.1 °F 40.8 °F 35.1 °F 71% 30.07 in 10.0 mi WNW 5.8 mph - N/A   Clear
10:56 PM 44.1 °F 41.5 °F 35.1 °F 71% 30.08 in 10.0 mi WNW 4.6 mph - N/A   Clear
11:56 PM 44.1 °F 40.1 °F 33.1 °F 65% 30.09 in 10.0 mi WNW 6.9 mph - N/A   Clear