Weather History for Petaluma, CA

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Friday, September 20, 2013

  Actual Average (KAPC) Record (KAPC)
Temperature  
Mean Temperature 60 °F 64 °F  
Max Temperature 75 °F 79 °F 97 °F (2011)
Min Temperature 44 °F 49 °F 38 °F (2004)
Degree Days  
Heating Degree Days 6    
Month to date heating degree days  
Since 1 July heating degree days  
Cooling Degree Days 0    
Month to date cooling degree days  
Year to date cooling degree days  
Growing Degree Days 10 (Base 50)    
Moisture  
Dew Point 54 °F    
Average Humidity 81    
Maximum Humidity 100    
Minimum Humidity 53    
Precipitation  
Precipitation 0.00 in - 0.14 in (1973)
Month to date precipitation  
Year to date precipitation  
Since 1 July precipitation  
Sea Level Pressure  
Sea Level Pressure 29.83 in    
Wind  
Wind Speed 4 mph (West)    
Max Wind Speed 21 mph    
Max Gust Speed 28 mph    
Visibility 10 miles    
Events      
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Date:

Astronomy

Sep. 20, 2013 Rise Set
Actual Time 6:56 AM PDT 7:10 PM PDT
Civil Twilight 6:30 AM PDT 7:36 PM PDT
Nautical Twilight 5:59 AM PDT 8:07 PM PDT
Astronomical Twilight 5:27 AM PDT 8:38 PM PDT
Moon 7:49 PM PDT (9/20) 8:15 AM PDT (9/20)
Length of Visible Light 13h 06m
Length of Day
12h 13m
Full, 98% of the Moon is Illuminated
Sep 20
Full
Sep 26
Last Quarter
Oct 4
New
Oct 11
First Quarter
Oct 18
Full

Hourly Weather History & Observations

Time (PDT) Temp. Windchill Dew Point Humidity Pressure Visibility Wind Dir Wind Speed Gust Speed Precip Events Conditions
12:15 AM 48.2 °F - 48.2 °F 100% 29.80 in 10.0 mi Calm Calm - N/A   Clear
12:35 AM 46.4 °F - 46.4 °F 100% 29.81 in 10.0 mi Calm Calm - N/A   Scattered Clouds
12:55 AM 46.4 °F - 46.4 °F 100% 29.80 in 10.0 mi Calm Calm - N/A   Partly Cloudy
1:15 AM 46.4 °F - 46.4 °F 100% 29.81 in 10.0 mi Calm Calm - N/A   Clear
1:35 AM 44.6 °F - 44.6 °F 100% 29.80 in 10.0 mi Calm Calm - N/A   Clear
1:55 AM 46.4 °F - 46.4 °F 100% 29.80 in 10.0 mi Calm Calm - N/A   Partly Cloudy
2:15 AM 46.4 °F - 46.4 °F 100% 29.80 in 10.0 mi Calm Calm - N/A   Partly Cloudy
2:35 AM 46.4 °F - 46.4 °F 100% 29.80 in 10.0 mi Calm Calm - N/A   Clear
2:55 AM 46.4 °F - 46.4 °F 100% 29.80 in 10.0 mi Calm Calm - N/A   Clear
3:15 AM 46.4 °F - 46.4 °F 100% 29.81 in 10.0 mi Calm Calm - N/A   Clear
3:35 AM 44.6 °F - 44.6 °F 100% 29.80 in 10.0 mi Calm Calm - N/A   Clear
3:55 AM 44.6 °F - 44.6 °F 100% 29.80 in 10.0 mi Calm Calm - N/A   Clear
4:15 AM 46.4 °F 44.3 °F 46.4 °F 100% 29.80 in 10.0 mi North 4.6 mph - N/A   Clear
4:35 AM 48.2 °F - 46.4 °F 93% 29.80 in 10.0 mi NNW 3.5 mph - N/A   Partly Cloudy
4:55 AM 48.2 °F - 46.4 °F 93% 29.80 in 10.0 mi Calm Calm - N/A   Scattered Clouds
5:15 AM 46.4 °F - 46.4 °F 100% 29.80 in 10.0 mi Calm Calm - N/A   Mostly Cloudy
5:35 AM 44.6 °F - 44.6 °F 100% 29.80 in 10.0 mi Calm Calm - N/A   Overcast
5:55 AM 48.2 °F - 48.2 °F 100% 29.80 in 10.0 mi NNW 4.6 mph - N/A   Mostly Cloudy
6:15 AM 48.2 °F - 48.2 °F 100% 29.80 in 10.0 mi Calm Calm - N/A   Scattered Clouds
6:35 AM 48.2 °F - 48.2 °F 100% 29.80 in 10.0 mi Calm Calm - N/A   Partly Cloudy
6:55 AM 48.2 °F - 46.4 °F 93% 29.81 in 10.0 mi Calm Calm - N/A   Clear
7:15 AM 46.4 °F - 46.4 °F 100% 29.82 in 10.0 mi Calm Calm - N/A   Clear
7:35 AM 46.4 °F - 46.4 °F 100% 29.83 in 10.0 mi Calm Calm - N/A   Clear
7:55 AM 48.2 °F - 48.2 °F 100% 29.83 in 10.0 mi Calm Calm - N/A   Clear
8:15 AM 51.8 °F - 50.0 °F 94% 29.83 in 10.0 mi West 4.6 mph - N/A   Clear
8:35 AM 55.4 °F - 50.0 °F 82% 29.84 in 10.0 mi NW 3.5 mph - N/A   Clear
8:55 AM 55.4 °F - 51.8 °F 88% 29.84 in 10.0 mi WNW 4.6 mph - N/A   Clear
9:15 AM 57.2 °F - 53.6 °F 88% 29.85 in 10.0 mi WNW 8.1 mph - N/A   Clear
9:35 AM 60.8 °F - 55.4 °F 82% 29.86 in 10.0 mi WNW 9.2 mph 16.1 mph N/A   Clear
9:55 AM 60.8 °F - 55.4 °F 82% 29.87 in 10.0 mi WNW 8.1 mph - N/A   Mostly Cloudy
10:15 AM 64.4 °F - 55.4 °F 73% 29.86 in 10.0 mi WNW 10.4 mph - N/A   Scattered Clouds
10:35 AM 66.2 °F - 55.4 °F 68% 29.86 in 10.0 mi WNW 10.4 mph - N/A   Clear
10:55 AM 68.0 °F - 55.4 °F 64% 29.86 in 10.0 mi NW 9.2 mph - N/A   Clear
11:15 AM 71.6 °F - 57.2 °F 60% 29.85 in 10.0 mi NNW 8.1 mph - N/A   Mostly Cloudy
11:35 AM 71.6 °F - 57.2 °F 60% 29.85 in 10.0 mi NW 5.8 mph - N/A   Overcast
11:55 AM 75.2 °F - 57.2 °F 53% 29.85 in 10.0 mi West 20.7 mph 27.6 mph N/A   Mostly Cloudy
12:15 PM 75.2 °F - 59.0 °F 57% 29.85 in 10.0 mi West 15.0 mph 26.5 mph N/A   Scattered Clouds
12:35 PM 73.4 °F - 57.2 °F 57% 29.85 in 10.0 mi West 15.0 mph 19.6 mph N/A   Clear
12:55 PM 75.2 °F - 57.2 °F 53% 29.85 in 10.0 mi West 17.3 mph 23.0 mph N/A   Partly Cloudy
1:15 PM 75.2 °F - 57.2 °F 53% 29.85 in 10.0 mi West 15.0 mph 20.7 mph N/A   Scattered Clouds
1:35 PM 75.2 °F - 57.2 °F 53% 29.85 in 10.0 mi WNW 16.1 mph 21.9 mph N/A   Scattered Clouds
1:55 PM 73.4 °F - 59.0 °F 61% 29.85 in 10.0 mi West 12.7 mph - N/A   Mostly Cloudy
2:15 PM 75.2 °F - 59.0 °F 57% 29.84 in 10.0 mi WSW 12.7 mph 17.3 mph N/A   Mostly Cloudy
2:35 PM 71.6 °F - 59.0 °F 64% 29.85 in 10.0 mi WNW 15.0 mph 20.7 mph N/A   Mostly Cloudy
2:55 PM 73.4 °F - 59.0 °F 61% 29.85 in 10.0 mi NW 9.2 mph 18.4 mph N/A   Mostly Cloudy
3:15 PM 75.2 °F - 57.2 °F 53% 29.84 in 10.0 mi West 10.4 mph 19.6 mph N/A   Overcast
3:35 PM 73.4 °F - 59.0 °F 61% 29.84 in 10.0 mi WNW 10.4 mph 18.4 mph N/A   Mostly Cloudy
3:55 PM 73.4 °F - 57.2 °F 57% 29.84 in 10.0 mi West 15.0 mph - N/A   Overcast
4:15 PM 73.4 °F - 59.0 °F 61% 29.83 in 10.0 mi West 11.5 mph 19.6 mph N/A   Overcast
4:35 PM 71.6 °F - 57.2 °F 60% 29.84 in 10.0 mi West 11.5 mph 18.4 mph N/A   Overcast
4:55 PM 71.6 °F - 57.2 °F 60% 29.84 in 10.0 mi WNW 12.7 mph 18.4 mph N/A   Overcast
5:15 PM 71.6 °F - 57.2 °F 60% 29.84 in 10.0 mi West 11.5 mph - N/A   Overcast
5:35 PM 69.8 °F - 59.0 °F 68% 29.84 in 10.0 mi WSW 10.4 mph 19.6 mph N/A   Overcast
5:55 PM 68.0 °F - 59.0 °F 73% 29.84 in 10.0 mi West 8.1 mph - N/A   Overcast
6:15 PM 68.0 °F - 59.0 °F 73% 29.84 in 10.0 mi West 9.2 mph - N/A   Overcast
6:35 PM 68.0 °F - 59.0 °F 73% 29.84 in 10.0 mi WSW 11.5 mph - N/A   Overcast
6:55 PM 66.2 °F - 59.0 °F 78% 29.84 in 10.0 mi WSW 8.1 mph - N/A   Overcast
7:15 PM 66.2 °F - 59.0 °F 78% 29.85 in 10.0 mi WSW 9.2 mph - N/A   Overcast
7:35 PM 66.2 °F - 59.0 °F 78% 29.85 in 10.0 mi WSW 8.1 mph - N/A   Overcast
7:55 PM 66.2 °F - 59.0 °F 78% 29.85 in 10.0 mi SW 6.9 mph - N/A   Overcast
8:15 PM 64.4 °F - 59.0 °F 83% 29.85 in 10.0 mi SSW 8.1 mph - N/A   Overcast
8:35 PM 64.4 °F - 59.0 °F 83% 29.85 in 10.0 mi SSW 5.8 mph - N/A   Overcast
8:55 PM 64.4 °F - 59.0 °F 83% 29.86 in 10.0 mi Calm Calm - N/A   Overcast
9:15 PM 64.4 °F - 59.0 °F 83% 29.86 in 10.0 mi Calm Calm - N/A   Overcast
9:35 PM 64.4 °F - 59.0 °F 83% 29.86 in 10.0 mi Calm Calm - N/A   Overcast
9:55 PM 64.4 °F - 59.0 °F 83% 29.86 in 10.0 mi Calm Calm - N/A   Overcast
10:15 PM 64.4 °F - 60.8 °F 88% 29.86 in 10.0 mi Calm Calm - N/A   Overcast
10:35 PM 64.4 °F - 59.0 °F 83% 29.85 in 7.0 mi South 3.5 mph - N/A   Overcast
10:55 PM 64.4 °F - 59.0 °F 83% 29.85 in 10.0 mi WSW 5.8 mph - N/A   Overcast
11:15 PM 64.4 °F - 60.8 °F 88% 29.85 in 8.0 mi Calm Calm - N/A   Overcast
11:35 PM 64.4 °F - 59.0 °F 83% 29.84 in 1.8 mi Calm Calm - N/A   Overcast
11:55 PM 64.4 °F - 59.0 °F 83% 29.84 in 10.0 mi Calm Calm - N/A   Overcast