Weather History for Napa County, CA

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Month of December, 2011

  Max Avg Min Sum
Temperature  
Max Temperature 75 °F 60 °F 53 °F
Mean Temperature 61 °F 46 °F 39 °F
Min Temperature 47 °F 31 °F 20 °F
Degree Days  
Heating Degree Days (base 65) 26 19 4 598
Cooling Degree Days (base 65) 0 0 0 0
Growing Degree Days (base 50) 12 1 0 24
Dew Point  
Dew Point 54 °F 32 °F 5 °F
Precipitation  
Precipitation 0.09 in 0.01 in 0.00 in 0.16 in
Snowdepth - - - -
Wind  
Wind 32 mph 5 mph 0 mph
Gust Wind 133 mph 26 mph 18 mph
Sea Level Pressure  
Sea Level Pressure 30.56 in 30.18 in 29.74 in

Monthly Weather History Graph

Monthly Weather History Graph

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Date:

Astronomy

Dec. 10, 2011 Rise Set
Actual Time 7:14 AM PST 4:49 PM PST
Civil Twilight 6:45 AM PST 5:18 PM PST
Nautical Twilight 6:12 AM PST 5:51 PM PST
Astronomical Twilight 5:40 AM PST 6:23 PM PST
Moon 5:07 PM PST (12/10) 7:19 AM PST (12/10)
Length of Visible Light 10h 33m
Length of Day
9h 34m
Full, 100% of the Moon is Illuminated
Dec 10
Full
Dec 17
Last Quarter
Dec 24
New
Dec 31
First Quarter
Jan 8
Full

Weather History Calendar

Precipitation Actual month total 0.16 Average Month Total: 3.63
Sunday Monday Tuesday Wednesday Thursday Friday Saturday
 
Clear
Actual:
69 | 45 0.00
Average:
61 | 39 0.09
Clear
Actual:
75 | 47 0.00
Average:
60 | 39 0.21
Clear
Actual:
66 | 38 0.00
Average:
60 | 41 0.18
Clear
Actual:
60 | 30 0.00
Average:
59 | 39 0.13
Clear
Actual:
65 | 33 0.00
Average:
60 | 40 0.11
Clear
Actual:
59 | 26 0.00
Average:
60 | 41 0.09
Fog
Actual:
58 | 27 0.00
Average:
60 | 41 0.10
Fog
Actual:
59 | 26 0.00
Average:
60 | 42 0.12
Clear
Actual:
62 | 30 0.00
Average:
59 | 39 0.12
Clear
Actual:
59 | 29 0.00
Average:
59 | 39 0.13
Rain
Actual:
53 | 30 0.01
Average:
57 | 38 0.12
Rain
Actual:
55 | 32 0.03
Average:
57 | 37 0.05
Fog
Actual:
56 | 25 0.00
Average:
56 | 38 0.03
Fog
Actual:
53 | 26 0.00
Average:
57 | 38 0.12
Rain
Actual:
56 | 38 0.09
Average:
57 | 39 0.10
Clear
Actual:
69 | 30 0.00
Average:
57 | 38 0.09
Clear
Actual:
60 | 33 0.00
Average:
58 | 38 0.15
Fog
Actual:
53 | 27 0.00
Average:
56 | 37 0.08
Fog
Actual:
67 | 36 0.00
Average:
57 | 37 0.15
Clear
Actual:
58 | 26 0.00
Average:
54 | 36 0.16
Clear
Actual:
58 | 27 0.00
Average:
54 | 37 0.16
Clear
Actual:
65 | 25 0.00
Average:
54 | 36 0.13
Clear
Actual:
57 | 20 0.00
Average:
54 | 35 0.12
Clear
Actual:
59 | 24 0.00
Average:
55 | 36 0.18
Clear
Actual:
56 | 25 0.00
Average:
55 | 37 0.11
Fog
Actual:
53 | 24 0.00
Average:
55 | 36 0.05
Fog
Actual:
56 | 35 0.00
Average:
54 | 37 0.10
Scattered Clouds
Actual:
61 | 35 0.00
Average:
56 | 36 0.14
Fog
Actual:
59 | 37 0.00
Average:
56 | 38 0.15
Rain
Actual:
57 | 43 0.03
Average:
56 | 36 0.11
Fog
Actual:
62 | 33 0.00
Average:
56 | 37 0.05
 

Calendar Legend

Sunny
Clear
Mostly Cloudy
Partly Sunny
Partly Cloudy
Mostly Sunny
Cloudy Rain Snow
Hail
Flurries
Thunderstorms Hazy
Fog
Sleet '?' denotes
'chance of'
Unknown

Daily Weather History & Observations

2011 Temp. (°F) Dew Point (°F) Humidity (%) Sea Level Press. (in) Visibility (mi) Wind (mph) Precip. (in) Events
Dec high avg low high avg low high avg low high avg low high avg low high avg high sum  
1 69 57 45 25 20 15 35 24 13 30.25 30.14 30.02 10 10 10 29 17 37 0.00  
2 75 61 47 25 19 14 39 25 10 30.04 29.97 29.92 10 10 10 32 17 39 0.00  
3 66 52 38 21 14 9 44 28 11 30.23 30.13 30.06 10 10 10 32 10 40 0.00  
4 60 45 30 41 30 22 85 59 33 30.26 30.19 30.12 10 10 10 8 3 15 0.00  
5 65 49 33 31 21 10 89 51 12 30.29 30.21 30.13 10 10 10 22 9 28 0.00  
6 59 43 26 34 28 23 82 56 30 30.40 30.33 30.30 10 10 8 9 2 16 0.00  
7 58 43 27 36 31 26 100 67 33 30.32 30.21 30.14 10 7 0 8 2 29 0.00 Fog
8 59 43 26 39 31 25 100 74 47 30.17 30.15 30.08 10 6 0 8 2 20 0.00 Fog
9 62 46 30 39 34 29 96 68 39 30.22 30.16 30.13 10 9 8 16 6 20 0.00  
10 59 44 29 39 33 27 92 70 47 30.15 30.08 30.01 10 9 3 14 3 23 0.00  
11 53 42 30 42 35 28 96 80 63 30.05 29.95 29.82 10 6 1 12 4 16 0.01 Rain
12 55 44 32 43 40 32 92 77 61 29.87 29.79 29.74 10 8 4 24 2 133 0.03 Rain
13 56 41 25 42 33 23 100 80 59 30.15 30.01 29.88 10 6 0 13 2 16 0.00 Fog
14 53 40 26 42 32 25 100 80 59 30.31 30.22 30.14 10 4 0 9 2 10 0.00 Fog
15 56 47 38 46 41 36 93 74 55 30.29 30.21 30.16 10 9 4 18 6 22 0.09 Rain
16 69 50 30 40 34 28 100 61 22 30.25 30.18 30.10 10 8 1 16 4 21 0.00  
17 60 47 33 42 37 31 92 68 44 30.18 30.12 30.07 10 6 2 18 6 23 0.00  
18 53 40 27 44 35 25 100 86 71 30.22 30.14 30.09 10 5 0 9 3 13 0.00 Fog
19 67 52 36 43 39 26 100 65 30 30.12 30.07 29.99 10 5 0 15 3 17 0.00 Fog
20 58 42 26 38 31 24 89 65 40 30.09 30.05 30.01 10 10 8 14 3 43 0.00  
21 58 43 27 40 29 7 92 54 16 30.14 30.07 30.04 10 7 4 25 4 30 0.00  
22 65 45 25 19 10 5 63 37 11 30.46 30.29 30.14 10 10 10 30 10 36 0.00  
23 57 39 20 26 21 15 81 51 20 30.56 30.50 30.46 10 10 10 10 3 12 0.00  
24 59 42 24 33 27 22 92 62 31 30.48 30.42 30.35 10 9 7 18 8 24 0.00  
25 56 41 25 36 28 22 92 67 41 30.44 30.36 30.30 10 7 4 9 2 14 0.00  
26 53 39 24 44 34 23 100 84 68 30.37 30.32 30.27 10 4 0 8 3 20 0.00 Fog
27 56 46 35 43 38 33 100 80 59 30.39 30.33 30.27 10 5 0 9 2 43 0.00 Fog
28 61 48 35 45 39 34 96 74 51 30.37 30.31 30.27 10 10 6 8 2 23 0.00  
29 59 48 37 52 46 37 100 79 57 30.28 30.19 30.11 10 3 0 12 2 32 0.00 Fog
30 57 50 43 54 50 42 100 90 80 30.24 30.17 30.11 10 5 0 13 6 16 0.03 Fog , Rain
31 62 48 33 46 40 31 100 69 38 30.25 30.19 30.14 10 5 0 16 5 23 0.00 Fog