Weather History for San Francisco, CA

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Friday, January 15, 1999

  Actual Average Record
Temperature  
Mean Temperature 52 °F 50 °F  
Max Temperature 57 °F 56 °F 73 °F (2014)
Min Temperature 48 °F 44 °F 31 °F (1963)
Degree Days  
Heating Degree Days 12 15  
Month to date heating degree days 225  
Since 1 July heating degree days 1235  
Cooling Degree Days 0 0  
Month to date cooling degree days 0  
Year to date cooling degree days 0  
Growing Degree Days 2 (Base 50)    
Moisture  
Dew Point 50 °F    
Average Humidity 91    
Maximum Humidity 100    
Minimum Humidity 82    
Precipitation  
Precipitation 0.25 in 0.14 in 1.03 in (1956)
Month to date precipitation 2.11  
Year to date precipitation 2.11  
Since 1 July precipitation 9.68  
Sea Level Pressure  
Sea Level Pressure 30.17 in    
Wind  
Wind Speed 4 mph (SE)    
Max Wind Speed 20 mph    
Max Gust Speed 25 mph    
Visibility 5 miles    
Events Rain    
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Date:

Astronomy

Jan. 15, 1999 Rise Set
Actual Time 7:23 AM PST 5:14 PM PST
Civil Twilight 6:54 AM PST 5:43 PM PST
Nautical Twilight 6:22 AM PST 6:15 PM PST
Astronomical Twilight 5:51 AM PST 6:46 PM PST
Moon 5:36 AM PST (1/15) 3:50 PM PST (1/15)
Length of Visible Light 10h 48m
Length of Day
9h 51m
Waning Crescent, 4% of the Moon is Illuminated
Jan 15
Waning Crescent
Jan 17
New
Jan 24
First Quarter
Jan 31
Full
Feb 8
Last Quarter

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 46.9 °F 89% 30.25 in 4.0 mi ESE 3.5 mph - 0.04 in Rain Light Rain
1:56 AM 50.0 °F 46.9 °F 89% 30.24 in 3.0 mi East 4.6 mph - 0.01 in   Mostly Cloudy
2:56 AM 48.9 °F 46.9 °F 93% 30.24 in 3.0 mi Calm Calm - N/A   Mostly Cloudy
3:25 AM 48.2 °F 46.4 °F 93% 30.25 in 2.5 mi Calm Calm - N/A   Mostly Cloudy
3:56 AM 48.0 °F 46.9 °F 96% 30.24 in 3.0 mi SE 3.5 mph - N/A   Mostly Cloudy
4:56 AM 48.9 °F 48.0 °F 97% 30.23 in 3.0 mi Calm Calm - N/A   Mostly Cloudy
5:56 AM 50.0 °F 48.0 °F 93% 30.25 in 3.0 mi Calm Calm - N/A   Mostly Cloudy
6:56 AM 50.0 °F 48.0 °F 93% 30.27 in 2.5 mi Calm Calm - 0.00 in   Overcast
7:36 AM 48.2 °F 48.2 °F 100% 30.27 in 1.8 mi Calm Calm - N/A   Overcast
7:56 AM 48.9 °F 48.0 °F 97% 30.28 in 1.0 mi NNE 3.5 mph - N/A   Overcast
8:49 AM 50.0 °F 48.2 °F 94% 30.26 in 1.2 mi SE 5.8 mph - N/A   Overcast
8:56 AM 50.0 °F 46.9 °F 89% 30.26 in 1.8 mi ESE 6.9 mph - N/A   Overcast
9:02 AM 51.8 °F 48.2 °F 88% 30.25 in 1.8 mi ESE 4.6 mph - N/A   Overcast
9:44 AM 50.0 °F 48.2 °F 94% 30.21 in 2.0 mi East 10.4 mph - N/A   Overcast
9:56 AM 50.0 °F 46.9 °F 89% 30.20 in 2.0 mi East 10.4 mph - N/A   Overcast
10:42 AM 53.6 °F 48.2 °F 82% 30.23 in 4.0 mi Calm Calm - N/A   Haze
10:56 AM 53.1 °F 48.9 °F 86% 30.23 in 3.0 mi Calm Calm - N/A   Mostly Cloudy
11:06 AM 51.8 °F 48.2 °F 88% 30.24 in 2.0 mi North 10.4 mph - 0.00 in Rain Light Rain
11:56 AM 53.1 °F 50.0 °F 89% 30.25 in 2.0 mi NW 5.8 mph - 0.00 in Rain Light Rain
12:31 PM 51.8 °F 48.2 °F 88% 30.23 in 3.0 mi NNE 5.8 mph - 0.00 in   Overcast
12:56 PM 52.0 °F 48.9 °F 89% 30.21 in 2.0 mi NNE 5.8 mph - 0.00 in   Overcast
1:56 PM 53.1 °F 48.9 °F 86% 30.16 in 2.0 mi East 3.5 mph - N/A   Overcast
2:56 PM 55.9 °F 51.1 °F 84% 30.14 in 2.0 mi Calm Calm - N/A   Haze
3:19 PM 55.4 °F 51.8 °F 88% 30.13 in 4.0 mi NE 3.5 mph - N/A   Mostly Cloudy
3:56 PM 55.0 °F 51.1 °F 86% 30.12 in 4.0 mi Calm Calm - N/A   Mostly Cloudy
4:56 PM 55.0 °F 52.0 °F 89% 30.10 in 10.0 mi West 6.9 mph - N/A   Mostly Cloudy
5:49 PM 53.6 °F 51.8 °F 94% 30.09 in 9.0 mi NW 5.8 mph - N/A   Overcast
5:56 PM 53.1 °F 51.1 °F 93% 30.09 in 9.0 mi NW 4.6 mph - N/A   Overcast
6:12 PM 53.6 °F 51.8 °F 94% 30.10 in 10.0 mi West 8.1 mph - N/A   Overcast
6:56 PM 55.9 °F 53.1 °F 90% 30.09 in 10.0 mi SSW 6.9 mph - N/A   Overcast
7:15 PM 55.4 °F 51.8 °F 88% 30.08 in 8.0 mi South 5.8 mph - 0.01 in Rain Light Rain
7:56 PM 55.9 °F 53.1 °F 90% 30.08 in 8.0 mi South 6.9 mph - 0.02 in Rain Light Rain
8:38 PM 55.4 °F 53.6 °F 94% 30.07 in 3.0 mi SE 4.6 mph - 0.01 in   Overcast
8:49 PM 55.4 °F 53.6 °F 94% 30.07 in 2.5 mi SE 4.6 mph - 0.02 in Rain Light Rain
8:56 PM 54.0 °F 54.0 °F 100% 30.07 in 3.0 mi SE 5.8 mph - 0.03 in Rain Light Rain
9:32 PM 55.4 °F 53.6 °F 94% 30.08 in 8.0 mi SSW 12.7 mph - 0.03 in Rain Light Rain
9:56 PM 57.0 °F 54.0 °F 89% 30.07 in 8.0 mi SW 19.6 mph - 0.06 in Rain Light Rain
10:56 PM 57.0 °F 54.0 °F 89% 30.09 in 10.0 mi WSW 19.6 mph 25.3 mph 0.09 in Rain Light Rain
11:49 PM 57.2 °F 53.6 °F 88% 30.07 in 10.0 mi SW 15.0 mph 25.3 mph 0.00 in   Overcast
11:56 PM 57.0 °F 54.0 °F 89% 30.07 in 10.0 mi SW 12.7 mph 20.7 mph 0.00 in   Overcast