Weather History for Napa County, CA

Change the Weather History Date:

Wednesday, September 19, 2012

  Actual Average Record
Temperature  
Mean Temperature 58 °F 64 °F  
Max Temperature 73 °F 80 °F 97 °F (2002)
Min Temperature 42 °F 49 °F 41 °F (2008)
Degree Days  
Heating Degree Days 7    
Month to date heating degree days 48  
Since 1 July heating degree days 103  
Cooling Degree Days 0    
Month to date cooling degree days 10  
Year to date cooling degree days 163  
Growing Degree Days 8 (Base 50)    
Moisture  
Dew Point 47 °F    
Average Humidity 73    
Maximum Humidity 100    
Minimum Humidity 46    
Precipitation  
Precipitation 0.00 in - 0.51 in (1977)
Month to date precipitation 0.00  
Year to date precipitation 13.77  
Since 1 July precipitation T  
Sea Level Pressure  
Sea Level Pressure 30.05 in    
Wind  
Wind Speed 6 mph (SW)    
Max Wind Speed 16 mph    
Max Gust Speed 20 mph    
Visibility 6 miles    
Events Fog    
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

Daily Weather History Graph

Daily Weather History Graph

Search for Another Location

Airport:

Trip Planner

Search our weather history database for the weather conditions in past years. The results will help you decide how hot, cold, wet, or windy it might be!

Date:

Astronomy

Sep. 19, 2012 Rise Set
Actual Time 6:54 AM PDT 7:09 PM PDT
Civil Twilight 6:28 AM PDT 7:36 PM PDT
Nautical Twilight 5:57 AM PDT 8:07 PM PDT
Astronomical Twilight 5:25 AM PDT 8:38 PM PDT
Moon 11:06 AM PDT (9/19) 9:28 PM PDT (9/19)
Length of Visible Light 13h 07m
Length of Day
12h 15m
Waxing Crescent, 18% of the Moon is Illuminated
Sep 19
Waxing Crescent
Sep 22
First Quarter
Sep 29
Full
Oct 8
Last Quarter
Oct 15
New

Hourly Weather History & Observations

Time (PDT) Temp. Dew Point Humidity Pressure Visibility Wind Dir Wind Speed Gust Speed Precip Events Conditions
12:54 AM 46.9 °F 45.0 °F 93% 30.04 in 9.0 mi Calm Calm - N/A   Clear
1:42 AM 46.4 °F 44.6 °F 93% 30.06 in 1.8 mi Calm Calm - N/A   Clear
1:52 AM 50.0 °F 46.4 °F 87% 30.06 in 3.0 mi Calm Calm - N/A   Clear
1:54 AM 48.9 °F 46.9 °F 93% 30.04 in 6.0 mi Calm Calm - N/A   Clear
2:54 AM 48.0 °F 45.0 °F 89% 30.04 in 9.0 mi Calm Calm - N/A   Clear
3:54 AM 46.9 °F 45.0 °F 93% 30.03 in 7.0 mi NNW 4.6 mph - N/A   Clear
4:33 AM 44.6 °F 42.8 °F 93% 30.06 in 1.8 mi Calm Calm - N/A   Clear
4:44 AM 46.4 °F 44.6 °F 93% 30.06 in 3.0 mi Calm Calm - N/A   Clear
4:54 AM 44.1 °F 44.1 °F 100% 30.04 in 6.0 mi Calm Calm - N/A   Clear
4:59 AM 44.6 °F 42.8 °F 93% 30.06 in 1.2 mi Calm Calm - N/A   Partly Cloudy
5:01 AM 44.6 °F 42.8 °F 93% 30.06 in 0.8 mi Calm Calm - N/A   Mist
5:08 AM 42.8 °F 41.0 °F 93% 30.06 in 0.2 mi Calm Calm - N/A Fog Fog
5:47 AM 48.2 °F 46.4 °F 93% 30.07 in 1.0 mi Calm Calm - N/A   Mist
6:54 AM 44.1 °F 43.0 °F 96% 30.06 in 0.2 mi Calm Calm - N/A Fog Fog
7:09 AM 44.6 °F 44.6 °F 100% 30.09 in 1.0 mi Calm Calm - N/A   Mist
7:12 AM 44.6 °F 44.6 °F 100% 30.09 in 0.5 mi Calm Calm - N/A Fog Fog
7:44 AM 46.4 °F 46.4 °F 100% 30.10 in 1.2 mi Calm Calm - N/A   Mostly Cloudy
7:46 AM 46.4 °F 46.4 °F 100% 30.10 in 3.0 mi Calm Calm - N/A   Mostly Cloudy
7:54 AM 48.9 °F 48.0 °F 97% 30.07 in 4.0 mi Calm Calm - N/A   Scattered Clouds
8:12 AM 51.8 °F 50.0 °F 94% 30.10 in 9.0 mi Calm Calm - N/A   Mostly Cloudy
8:54 AM 52.0 °F 50.0 °F 93% 30.08 in 10.0 mi Calm Calm - N/A   Overcast
9:54 AM 57.9 °F 50.0 °F 75% 30.08 in 10.0 mi West 5.8 mph - N/A   Mostly Cloudy
10:00 AM 57.2 °F 50.0 °F 77% 30.11 in 10.0 mi West 6.9 mph - N/A   Scattered Clouds
10:54 AM 61.0 °F 51.1 °F 70% 30.08 in 10.0 mi Variable 4.6 mph - N/A   Clear
11:54 AM 66.0 °F 52.0 °F 60% 30.07 in 10.0 mi SW 8.1 mph - N/A   Clear
12:54 PM 68.0 °F 53.1 °F 59% 30.05 in 10.0 mi SSW 9.2 mph - N/A   Clear
1:54 PM 70.0 °F 52.0 °F 53% 30.03 in 10.0 mi SSW 11.5 mph - N/A   Clear
2:54 PM 72.0 °F 52.0 °F 49% 30.01 in 10.0 mi SSW 13.8 mph - N/A   Clear
3:54 PM 73.0 °F 52.0 °F 48% 29.99 in 10.0 mi SSW 15.0 mph - N/A   Clear
4:54 PM 72.0 °F 53.1 °F 51% 29.99 in 10.0 mi SSW 15.0 mph - N/A   Clear
5:54 PM 70.0 °F 50.0 °F 49% 29.99 in 10.0 mi WSW 13.8 mph - N/A   Clear
6:54 PM 64.0 °F 50.0 °F 60% 29.99 in 10.0 mi WSW 11.5 mph - N/A   Clear
7:54 PM 57.9 °F 50.0 °F 75% 30.00 in 10.0 mi WSW 12.7 mph - N/A   Clear
8:54 PM 55.9 °F 50.0 °F 80% 30.02 in 10.0 mi WSW 9.2 mph - N/A   Clear
9:54 PM 53.1 °F 48.0 °F 83% 30.03 in 10.0 mi WSW 4.6 mph - N/A   Clear
10:54 PM 50.0 °F 46.0 °F 86% 30.03 in 10.0 mi Calm Calm - N/A   Clear
11:54 PM 46.9 °F 44.1 °F 90% 30.04 in 10.0 mi Calm Calm - N/A   Clear