Weather History for Napa County, CA

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Friday, December 21, 2012

  Actual Average Record
Temperature  
Mean Temperature 53 °F 45 °F  
Max Temperature 57 °F 55 °F 71 °F (1999)
Min Temperature 49 °F 36 °F 21 °F (1998)
Degree Days  
Heating Degree Days 12    
Month to date heating degree days 344  
Since 1 July heating degree days 916  
Cooling Degree Days 0    
Month to date cooling degree days 0  
Year to date cooling degree days 204  
Growing Degree Days 2 (Base 50)    
Moisture  
Dew Point 46 °F    
Average Humidity 72    
Maximum Humidity 89    
Minimum Humidity 54    
Precipitation  
Precipitation 0.17 in - 2.10 in (1924)
Month to date precipitation 2.02  
Year to date precipitation 19.40  
Since 1 July precipitation 5.63  
Sea Level Pressure  
Sea Level Pressure 29.89 in    
Wind  
Wind Speed 10 mph (SE)    
Max Wind Speed 33 mph    
Max Gust Speed 79 mph    
Visibility 8 miles    
Events Rain    
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. 21, 2012 Rise Set
Actual Time 7:22 AM PST 4:52 PM PST
Civil Twilight 6:52 AM PST 5:22 PM PST
Nautical Twilight 6:19 AM PST 5:55 PM PST
Astronomical Twilight 5:47 AM PST 6:27 PM PST
Moon 12:39 PM PST (12/21) 1:18 AM PST (12/21)
Length of Visible Light 10h 29m
Length of Day
9h 30m
Waxing Gibbous, 66% of the Moon is Illuminated
Dec 21
Waxing Gibbous
Dec 28
Full
Jan 4
Last Quarter
Jan 11
New
Jan 18
First Quarter

Hourly Weather History & Observations

Time (PST) Temp. Dew Point Humidity Pressure Visibility Wind Dir Wind Speed Gust Speed Precip Events Conditions
12:54 AM 51.1 °F 36.0 °F 56% 29.95 in 10.0 mi SSE 9.2 mph - N/A   Clear
1:54 AM 52.0 °F 37.9 °F 59% 29.94 in 10.0 mi SE 9.2 mph - N/A   Overcast
2:54 AM 52.0 °F 39.0 °F 61% 29.93 in 10.0 mi SE 10.4 mph - N/A   Overcast
3:54 AM 52.0 °F 39.9 °F 63% 29.91 in 10.0 mi SE 9.2 mph - N/A   Overcast
4:54 AM 52.0 °F 39.0 °F 61% 29.89 in 10.0 mi ESE 10.4 mph - N/A   Overcast
5:54 AM 53.1 °F 39.9 °F 61% 29.89 in 10.0 mi SE 10.4 mph - N/A   Overcast
6:54 AM 54.0 °F 41.0 °F 62% 29.89 in 10.0 mi SSE 9.2 mph - N/A   Overcast
7:32 AM 53.6 °F 44.6 °F 72% 29.90 in 10.0 mi East 15.0 mph 79.4 mph 0.00 in Rain Light Rain
7:54 AM 53.1 °F 44.1 °F 71% 29.88 in 10.0 mi SE 10.4 mph - 0.00 in   Overcast
8:54 AM 54.0 °F 44.1 °F 69% 29.89 in 8.0 mi SSE 11.5 mph - 0.00 in Rain Light Rain
9:54 AM 52.0 °F 46.0 °F 80% 29.89 in 10.0 mi SE 8.1 mph - 0.03 in Rain Light Rain
10:54 AM 53.1 °F 45.0 °F 74% 29.90 in 10.0 mi SSE 12.7 mph - 0.00 in   Overcast
11:54 AM 51.1 °F 46.9 °F 86% 29.90 in 7.0 mi North 4.6 mph - 0.00 in Rain Light Rain
12:54 PM 55.0 °F 48.0 °F 77% 29.85 in 10.0 mi SSE 17.3 mph 21.9 mph 0.00 in   Overcast
1:54 PM 57.0 °F 48.0 °F 72% 29.84 in 10.0 mi South 13.8 mph 23.0 mph N/A   Overcast
2:54 PM 55.9 °F 48.0 °F 75% 29.86 in 10.0 mi SSE 10.4 mph - N/A   Overcast
3:54 PM 51.1 °F 48.0 °F 89% 29.86 in 2.5 mi East 11.5 mph - 0.01 in Rain Light Rain
4:11 PM 48.2 °F 46.4 °F 93% 29.88 in 4.0 mi East 12.7 mph - 0.02 in Rain Light Rain
4:21 PM 48.2 °F 44.6 °F 87% 29.88 in 2.0 mi East 12.7 mph - 0.02 in Rain Light Rain
4:54 PM 53.1 °F 50.0 °F 89% 29.86 in 2.0 mi SSE 6.9 mph - 0.02 in Rain Light Rain
5:54 PM 53.1 °F 51.1 °F 93% 29.87 in 2.0 mi South 11.5 mph - 0.03 in   Overcast
6:00 PM 53.6 °F 51.8 °F 94% 29.89 in 6.0 mi South 11.5 mph - 0.01 in Rain Light Rain
6:21 PM 53.6 °F 51.8 °F 94% 29.90 in 10.0 mi South 6.9 mph - 0.02 in   Overcast
6:54 PM 54.0 °F 51.1 °F 90% 29.88 in 9.0 mi SSE 10.4 mph - 0.02 in Rain Light Rain
6:57 PM 53.6 °F 51.8 °F 94% 29.90 in 10.0 mi SSE 9.2 mph - 0.00 in Rain Light Rain
7:54 PM 53.1 °F 50.0 °F 89% 29.88 in 10.0 mi SE 8.1 mph - 0.00 in   Overcast
8:40 PM 53.6 °F 48.2 °F 82% 29.89 in 10.0 mi SE 5.8 mph - N/A   Overcast
8:54 PM 54.0 °F 48.9 °F 83% 29.87 in 10.0 mi SSE 6.9 mph - 0.00 in Rain Light Rain
9:28 PM 53.6 °F 50.0 °F 88% 29.90 in 10.0 mi SE 9.2 mph - 0.00 in   Overcast
9:54 PM 54.0 °F 50.0 °F 86% 29.88 in 10.0 mi SSE 5.8 mph - 0.00 in   Overcast
10:01 PM 53.6 °F 50.0 °F 88% 29.90 in 10.0 mi SSE 8.1 mph - N/A   Overcast
10:54 PM 54.0 °F 50.0 °F 86% 29.85 in 10.0 mi SSE 11.5 mph - N/A   Overcast
11:54 PM 53.1 °F 50.0 °F 89% 29.83 in 4.0 mi SE 11.5 mph - 0.05 in Rain Rain