Weather History for Napa County, CA

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Monday, December 31, 2012

  Actual Average Record
Temperature  
Mean Temperature 40 °F 45 °F  
Max Temperature 52 °F 54 °F 62 °F (2011)
Min Temperature 27 °F 36 °F 27 °F (2012)
Degree Days  
Heating Degree Days 25    
Month to date heating degree days 540  
Since 1 July heating degree days 1112  
Cooling Degree Days 0    
Month to date cooling degree days 0  
Year to date cooling degree days 204  
Moisture  
Dew Point 29 °F    
Average Humidity 62    
Maximum Humidity 82    
Minimum Humidity 41    
Precipitation  
Precipitation 0.00 in - 2.00 in (2005)
Month to date precipitation 4.18  
Year to date precipitation 21.56  
Since 1 July precipitation 7.79  
Sea Level Pressure  
Sea Level Pressure 30.22 in    
Wind  
Wind Speed 4 mph (ENE)    
Max Wind Speed 10 mph    
Max Gust Speed 10 mph    
Visibility 10 miles    
Events      
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Daily Weather History Graph

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Date:

Astronomy

Dec. 31, 2012 Rise Set
Actual Time 7:25 AM PST 4:59 PM PST
Civil Twilight 6:56 AM PST 5:28 PM PST
Nautical Twilight 6:23 AM PST 6:01 PM PST
Astronomical Twilight 5:51 AM PST 6:33 PM PST
Moon 8:32 PM PST (12/31) 9:13 AM PST (12/31)
Length of Visible Light 10h 32m
Length of Day
9h 33m
Waning Gibbous, 89% of the Moon is Illuminated
Dec 31
Waning Gibbous
Jan 4
Last Quarter
Jan 11
New
Jan 18
First Quarter
Jan 26
Full

Hourly Weather History & Observations

Time (PST) Temp. Windchill Dew Point Humidity Pressure Visibility Wind Dir Wind Speed Gust Speed Precip Events Conditions
12:54 AM 42.1 °F 39.2 °F 27.0 °F 55% 30.17 in 10.0 mi ENE 4.6 mph - N/A   Clear
1:54 AM 41.0 °F 37.1 °F 26.1 °F 55% 30.19 in 10.0 mi NE 5.8 mph - N/A   Clear
2:54 AM 39.9 °F 36.7 °F 27.0 °F 60% 30.20 in 10.0 mi East 4.6 mph - N/A   Clear
3:54 AM 39.0 °F 35.7 °F 27.0 °F 62% 30.21 in 10.0 mi ENE 4.6 mph - N/A   Clear
4:54 AM 34.0 °F 31.0 °F 25.0 °F 70% 30.19 in 10.0 mi ENE 3.5 mph - N/A   Clear
5:54 AM 33.1 °F 28.7 °F 26.1 °F 75% 30.21 in 10.0 mi North 4.6 mph - N/A   Clear
6:54 AM 30.9 °F - 25.0 °F 79% 30.24 in 10.0 mi Calm Calm - N/A   Clear
7:54 AM 30.0 °F - 25.0 °F 82% 30.25 in 10.0 mi Calm Calm - N/A   Clear
8:54 AM 37.9 °F - 30.0 °F 73% 30.25 in 10.0 mi Calm Calm - N/A   Clear
9:54 AM 44.1 °F 42.5 °F 30.0 °F 58% 30.27 in 10.0 mi NNW 3.5 mph - N/A   Clear
10:54 AM 48.0 °F - 30.9 °F 52% 30.28 in 10.0 mi Calm Calm - N/A   Clear
11:54 AM 51.1 °F - 28.0 °F 41% 30.25 in 10.0 mi Calm Calm - N/A   Clear
12:54 PM 51.1 °F - 34.0 °F 52% 30.23 in 10.0 mi WSW 9.2 mph - N/A   Clear
1:54 PM 50.0 °F - 30.9 °F 48% 30.22 in 10.0 mi SW 5.8 mph - N/A   Clear
2:54 PM 51.1 °F - 30.0 °F 44% 30.23 in 10.0 mi SW 5.8 mph - N/A   Clear
3:54 PM 50.0 °F - 30.9 °F 48% 30.21 in 10.0 mi South 4.6 mph - N/A   Clear
4:54 PM 46.9 °F - 35.1 °F 63% 30.23 in 10.0 mi West 5.8 mph - N/A   Clear
5:54 PM 45.0 °F 40.6 °F 37.9 °F 76% 30.20 in 10.0 mi SSE 8.1 mph - N/A   Partly Cloudy
6:54 PM 39.0 °F 36.8 °F 33.1 °F 79% 30.23 in 10.0 mi East 3.5 mph - N/A   Clear
7:54 PM 37.9 °F 35.5 °F 30.9 °F 76% 30.22 in 10.0 mi ESE 3.5 mph - N/A   Clear
8:54 PM 37.0 °F 34.5 °F 30.0 °F 76% 30.24 in 10.0 mi North 3.5 mph - N/A   Clear
11:54 PM 32.0 °F - 28.9 °F 88% 30.20 in 10.0 mi Calm Calm - N/A   Clear