Weather History for San Francisco, CA

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Tuesday, September 12, 1989

  Actual Average Record
Temperature  
Mean Temperature 62 °F 65 °F  
Max Temperature 70 °F 74 °F 100 °F (1979)
Min Temperature 54 °F 56 °F 47 °F (1970)
Degree Days  
Heating Degree Days 3 2  
Month to date heating degree days 24  
Since 1 July heating degree days 137  
Cooling Degree Days 0 2  
Month to date cooling degree days 24  
Year to date cooling degree days 121  
Growing Degree Days 12 (Base 50)    
Moisture  
Dew Point 53 °F    
Average Humidity 80    
Maximum Humidity 96    
Minimum Humidity 58    
Precipitation  
Precipitation 0.00 in 0.01 in 0.07 in (1963)
Month to date precipitation 0.04  
Year to date precipitation 13.16  
Since 1 July precipitation 0.08  
Sea Level Pressure  
Sea Level Pressure 29.90 in    
Wind  
Wind Speed 11 mph (NW)    
Max Wind Speed 22 mph    
Max Gust Speed -    
Visibility 8 miles    
Events Fog    
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Date:

Astronomy

Sep. 12, 1989 Rise Set
Actual Time 6:48 AM PDT 7:21 PM PDT
Civil Twilight 6:22 AM PDT 7:47 PM PDT
Nautical Twilight 5:51 AM PDT 8:18 PM PDT
Astronomical Twilight 5:19 AM PDT 8:50 PM PDT
Moon 5:53 PM PDT 3:22 AM PDT
Length of Visible Light 13h 25m
Length of Day
12h 32m
Waxing Gibbous, 90% of the Moon is Illuminated
Sep 12
Waxing Gibbous
Sep 15
Full
Sep 21
Last Quarter
Sep 29
New
Oct 7
First Quarter

Hourly Weather History & Observations

Time (PDT) Temp. Dew Point Humidity Pressure Visibility Wind Dir Wind Speed Gust Speed Precip Events Conditions
12:00 AM 55.0 °F 52.0 °F 89% 29.89 in 10.0 mi WNW 12.7 mph - N/A   Mostly Cloudy
12:27 AM - - N/A% 29.89 in 10.0 mi WNW 13.8 mph - N/A   Mostly Cloudy
1:00 AM 55.0 °F 52.0 °F 89% 29.89 in 10.0 mi WNW 11.5 mph - N/A   Mostly Cloudy
2:00 AM 54.0 °F 51.1 °F 90% 29.89 in 10.0 mi WNW 6.9 mph - N/A   Mostly Cloudy
3:00 AM 54.0 °F 51.1 °F 90% 29.90 in 10.0 mi WNW 8.1 mph - N/A   Overcast
3:26 AM - - N/A% 29.89 in 10.0 mi WNW 9.2 mph - N/A   Overcast
4:00 AM 54.0 °F 52.0 °F 93% 29.89 in 10.0 mi WNW 11.5 mph - N/A   Overcast
5:00 AM 54.0 °F 52.0 °F 93% 29.90 in 10.0 mi NW 10.4 mph - N/A   Overcast
5:24 AM - - N/A% 29.90 in 10.0 mi WNW 9.2 mph - N/A   Overcast
6:00 AM 54.0 °F 52.0 °F 93% 29.90 in 10.0 mi WNW 9.2 mph - N/A   Overcast
7:00 AM 55.0 °F 52.0 °F 89% 29.90 in 7.0 mi WSW 5.8 mph - N/A   Overcast
8:00 AM 55.9 °F 53.1 °F 90% 29.92 in 5.0 mi Calm Calm - N/A Fog Fog
8:39 AM - - N/A% 29.93 in 5.0 mi SW 3.5 mph - N/A Fog Fog
9:00 AM 57.9 °F 53.1 °F 84% 29.93 in 5.0 mi WSW 3.5 mph - N/A Fog Fog
10:00 AM 60.1 °F 53.1 °F 78% 29.93 in 6.0 mi NNW 4.6 mph - N/A Fog Fog
10:21 AM - - N/A% 29.94 in 6.0 mi NW 5.8 mph - N/A Fog Fog
11:00 AM 63.0 °F 54.0 °F 72% 29.93 in 7.0 mi North 6.9 mph - N/A   Scattered Clouds
12:00 PM 64.9 °F 55.0 °F 70% 29.92 in 7.0 mi ENE 5.8 mph - N/A   Clear
1:00 PM 66.9 °F 55.0 °F 66% 29.91 in 7.0 mi NE 8.1 mph - N/A   Clear
2:00 PM 70.0 °F 55.0 °F 59% 29.90 in 7.0 mi NNW 12.7 mph - N/A   Clear
3:00 PM 70.0 °F 55.0 °F 59% 29.87 in 7.0 mi NNW 13.8 mph - N/A   Clear
4:00 PM 69.1 °F 54.0 °F 58% 29.86 in 7.0 mi NW 15.0 mph - N/A   Clear
5:00 PM 68.0 °F 54.0 °F 61% 29.85 in 10.0 mi NW 21.9 mph - N/A   Clear
6:00 PM 68.0 °F 54.0 °F 61% 29.84 in 10.0 mi NW 18.4 mph - N/A   Clear
7:00 PM 63.0 °F 53.1 °F 70% 29.85 in 10.0 mi NW 20.7 mph - N/A   Clear
8:00 PM 59.0 °F 53.1 °F 81% 29.85 in 10.0 mi NW 17.3 mph - N/A   Clear
9:00 PM 57.0 °F 54.0 °F 89% 29.88 in 10.0 mi NW 16.1 mph - N/A   Clear
10:00 PM 55.0 °F 54.0 °F 96% 29.90 in 10.0 mi NW 13.8 mph - N/A   Clear
11:00 PM 55.0 °F 54.0 °F 96% 29.91 in 8.0 mi NW 11.5 mph - N/A   Clear