Weather History for KSFO - August, 2013

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Wednesday, August 21, 2013

  Actual Average Record
Temperature  
Mean Temperature 65 °F 65 °F  
Max Temperature 72 °F 73 °F 85 °F (1974)
Min Temperature 58 °F 56 °F 42 °F (1928)
Degree Days  
Heating Degree Days 0 1  
Month to date heating degree days 31 32  
Since 1 June heating degree days 197 202  
Since 1 July heating degree days 109 97  
Cooling Degree Days 0 1  
Month to date cooling degree days 16 21  
Year to date cooling degree days 88 85  
Since 1 June cooling degree days 61 66  
Growing Degree Days 14 (Base 50)    
Moisture  
Dew Point 53 °F    
Average Humidity 67    
Maximum Humidity 80    
Minimum Humidity 53    
Precipitation  
Precipitation 0.00 in 0.00 in 0.04 in (1968)
Month to date precipitation T 0.02  
Year to date precipitation 1.89 13.10  
Since 1 July precipitation T 0.02  
Sea Level Pressure  
Sea Level Pressure 29.92 in    
Wind  
Wind Speed 9 mph (West)    
Max Wind Speed 21 mph    
Max Gust Speed 25 mph    
Visibility 10 miles    
Events      
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Astronomy

Aug. 21, 2013 Rise Set
Actual Time 6:30 AM PDT 7:53 PM PDT
Civil Twilight 6:03 AM PDT 8:21 PM PDT
Nautical Twilight 5:30 AM PDT 8:53 PM PDT
Astronomical Twilight 4:55 AM PDT 9:28 PM PDT
Moon 8:08 PM PDT (8/21) 7:15 AM PDT (8/21)
Length of Visible Light 14h 17m
Length of Day
13h 23m
Full, 99% of the Moon is Illuminated
Aug 21
Full
Aug 28
Last Quarter
Sep 5
New
Sep 12
First Quarter
Sep 19
Full

Hourly Weather History & Observations

Time (PDT) Temp. Dew Point Humidity Pressure Visibility Wind Dir Wind Speed Gust Speed Precip Events Conditions
12:56 AM 59.0 °F 53.1 °F 81% 29.90 in 10.0 mi WNW 5.8 mph - N/A   Partly Cloudy
1:56 AM 59.0 °F 53.1 °F 81% 29.90 in 10.0 mi NW 5.8 mph - N/A   Partly Cloudy
2:56 AM 57.9 °F 52.0 °F 81% 29.90 in 10.0 mi West 5.8 mph - N/A   Partly Cloudy
3:56 AM 57.9 °F 52.0 °F 81% 29.89 in 10.0 mi West 5.8 mph - N/A   Mostly Cloudy
4:56 AM 57.9 °F 52.0 °F 81% 29.90 in 10.0 mi WNW 4.6 mph - N/A   Mostly Cloudy
5:56 AM 57.9 °F 52.0 °F 81% 29.90 in 10.0 mi Calm Calm - N/A   Mostly Cloudy
6:56 AM 57.9 °F 51.1 °F 78% 29.93 in 10.0 mi SSW 4.6 mph - N/A   Mostly Cloudy
7:56 AM 59.0 °F 52.0 °F 78% 29.93 in 10.0 mi SW 5.8 mph - N/A   Mostly Cloudy
8:56 AM 61.0 °F 52.0 °F 72% 29.94 in 10.0 mi SW 4.6 mph - N/A   Overcast
9:56 AM 62.1 °F 52.0 °F 70% 29.95 in 10.0 mi West 5.8 mph - N/A   Overcast
10:56 AM 66.0 °F 53.1 °F 63% 29.95 in 10.0 mi NNE 3.5 mph - N/A   Scattered Clouds
11:56 AM 66.9 °F 54.0 °F 63% 29.94 in 10.0 mi North 6.9 mph - N/A   Partly Cloudy
12:56 PM 69.1 °F 53.1 °F 57% 29.93 in 10.0 mi NW 15.0 mph - N/A   Partly Cloudy
1:56 PM 70.0 °F 53.1 °F 55% 29.91 in 10.0 mi WNW 13.8 mph - N/A   Partly Cloudy
2:56 PM 71.1 °F 53.1 °F 53% 29.89 in 10.0 mi West 16.1 mph - N/A   Scattered Clouds
3:56 PM 70.0 °F 53.1 °F 55% 29.88 in 10.0 mi WNW 17.3 mph - N/A   Scattered Clouds
4:56 PM 69.1 °F 53.1 °F 57% 29.88 in 10.0 mi West 17.3 mph - N/A   Scattered Clouds
5:56 PM 66.9 °F 53.1 °F 61% 29.89 in 10.0 mi West 18.4 mph - N/A   Partly Cloudy
6:56 PM 64.0 °F 53.1 °F 67% 29.89 in 10.0 mi West 18.4 mph - N/A   Partly Cloudy
7:56 PM 62.1 °F 53.1 °F 72% 29.91 in 10.0 mi West 12.7 mph - N/A   Partly Cloudy
8:56 PM 61.0 °F 53.1 °F 75% 29.93 in 10.0 mi West 12.7 mph - N/A   Scattered Clouds
9:56 PM 61.0 °F 53.1 °F 75% 29.94 in 10.0 mi West 10.4 mph - N/A   Scattered Clouds
10:56 PM 60.1 °F 53.1 °F 78% 29.94 in 10.0 mi WNW 8.1 mph - N/A   Partly Cloudy
11:56 PM 60.1 °F 53.1 °F 78% 29.94 in 10.0 mi West 6.9 mph - N/A   Scattered Clouds