Weather History for Napa County, CA

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Month of December, 2012

  Max Avg Min Sum
Temperature  
Max Temperature 70 °F 57 °F 47 °F
Mean Temperature 61 °F 48 °F 39 °F
Min Temperature 57 °F 38 °F 25 °F
Degree Days  
Heating Degree Days (base 65) 26 17 4 540
Cooling Degree Days (base 65) 0 0 0 0
Growing Degree Days (base 50) 10 1 0 36
Dew Point  
Dew Point 59 °F 41 °F 22 °F
Precipitation  
Precipitation 1.19 in 0.14 in 0.00 in 4.18 in
Snowdepth - - - -
Wind  
Wind 43 mph 5 mph 0 mph
Gust Wind 79 mph 25 mph 16 mph
Sea Level Pressure  
Sea Level Pressure 30.31 in 30.03 in 29.69 in

Monthly Weather History Graph

Monthly Weather History Graph

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Date:

Astronomy

Dec. 11, 2012 Rise Set
Actual Time 7:16 AM PST 4:49 PM PST
Civil Twilight 6:46 AM PST 5:18 PM PST
Nautical Twilight 6:13 AM PST 5:51 PM PST
Astronomical Twilight 5:41 AM PST 6:23 PM PST
Moon 5:18 AM PST (12/11) 3:32 PM PST (12/11)
Length of Visible Light 10h 32m
Length of Day
9h 33m
Waning Crescent, 4% of the Moon is Illuminated
Dec 11
Waning Crescent
Dec 13
New
Dec 19
First Quarter
Dec 28
Full
Jan 4
Last Quarter

Weather History Calendar

Precipitation Actual month total 4.18 Average Month Total: 3.63
Sunday Monday Tuesday Wednesday Thursday Friday Saturday
 
Rain
Actual:
64 | 57 0.32
Average:
61 | 39 0.09
Rain
Actual:
63 | 43 1.19
Average:
60 | 39 0.21
Fog
Actual:
60 | 37 0.00
Average:
60 | 41 0.18
Rain
Actual:
60 | 49 0.06
Average:
59 | 39 0.13
Rain
Actual:
61 | 56 0.15
Average:
60 | 40 0.11
Fog
Actual:
61 | 41 0.00
Average:
60 | 41 0.09
Fog
Actual:
60 | 37 0.00
Average:
60 | 41 0.10
Fog
Actual:
56 | 34 0.00
Average:
60 | 42 0.12
Fog
Actual:
70 | 36 0.00
Average:
59 | 39 0.12
Clear
Actual:
63 | 40 0.00
Average:
59 | 39 0.13
Rain
Actual:
56 | 35 0.02
Average:
57 | 38 0.12
Rain
Actual:
57 | 34 T
Average:
57 | 37 0.05
Scattered Clouds
Actual:
56 | 30 0.00
Average:
56 | 38 0.03
Partly Cloudy
Actual:
51 | 31 0.00
Average:
57 | 38 0.12
Rain
Actual:
47 | 30 0.07
Average:
57 | 39 0.10
Rain
Actual:
55 | 45 0.02
Average:
57 | 38 0.09
Rain
Actual:
60 | 40 0.02
Average:
58 | 38 0.15
Clear
Actual:
54 | 31 0.00
Average:
56 | 37 0.08
Clear
Actual:
52 | 25 0.00
Average:
57 | 37 0.15
Partly Cloudy
Actual:
60 | 28 0.00
Average:
54 | 36 0.16
Rain
Actual:
57 | 49 0.17
Average:
54 | 37 0.16
Thunderstorm
Actual:
58 | 45 0.81
Average:
54 | 36 0.13
Rain
Actual:
57 | 46 0.65
Average:
54 | 35 0.12
Fog
Actual:
56 | 34 0.00
Average:
55 | 36 0.18
Rain
Actual:
47 | 37 0.69
Average:
55 | 37 0.11
Rain
Actual:
56 | 39 0.01
Average:
55 | 36 0.05
Scattered Clouds
Actual:
54 | 35 0.00
Average:
54 | 37 0.10
Partly Cloudy
Actual:
47 | 33 0.00
Average:
56 | 36 0.14
Partly Cloudy
Actual:
55 | 34 T
Average:
56 | 38 0.15
Scattered Clouds
Actual:
58 | 32 0.00
Average:
56 | 36 0.11
Clear
Actual:
52 | 27 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

2012 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 64 61 57 59 56 52 100 88 75 30.03 29.95 29.84 10 5 2 18 8 26 0.32 Rain
2 63 53 43 59 53 42 100 78 55 30.09 29.85 29.69 10 7 1 43 12 53 1.19 Rain
3 60 49 37 48 42 36 100 80 60 30.20 30.14 30.09 10 5 0 13 2 22 0.00 Fog
4 60 55 49 54 51 47 96 86 75 30.20 30.16 30.13 10 8 2 8 2 29 0.06 Rain
5 61 59 56 57 55 54 100 92 84 30.17 30.12 30.08 10 4 1 12 5 15 0.15 Rain
6 61 51 41 54 49 39 96 83 69 30.14 30.11 30.04 10 7 0 12 2 14 0.00 Fog
7 60 49 37 48 42 36 100 78 55 30.15 30.10 30.05 10 5 0 8 1 8 0.00 Fog
8 56 45 34 46 39 32 100 83 66 30.12 30.07 30.02 10 4 0 8 1 13 0.00 Fog
9 70 53 36 48 40 34 100 70 40 30.16 30.12 30.08 10 8 0 10 2 13 0.00 Fog
10 63 52 40 49 43 38 92 74 56 30.22 30.15 30.09 10 10 10 9 2 16 0.00  
11 56 46 35 50 42 34 100 89 77 30.09 30.00 29.83 10 4 0 15 5 21 0.02 Fog , Rain
12 57 46 34 49 41 33 93 74 55 29.88 29.84 29.80 10 10 9 16 5 18 T Rain
13 56 43 30 41 34 28 100 71 41 29.92 29.88 29.84 10 10 10 10 2 22 0.00  
14 51 41 31 42 35 30 92 79 66 30.01 29.90 29.80 10 10 10 8 4 29 0.00  
15 47 39 30 43 38 30 100 88 76 30.09 30.03 29.99 10 8 3 20 8 25 0.07 Rain
16 55 50 45 52 45 39 93 84 74 30.09 30.04 29.98 10 6 1 17 7 22 0.02 Rain
17 60 50 40 54 49 37 93 83 72 30.03 29.98 29.94 10 9 3 23 9 29 0.02 Rain
18 54 43 31 38 32 26 96 69 41 30.18 30.04 29.98 10 8 1 23 7 28 0.00  
19 52 39 25 33 27 22 85 58 30 30.31 30.24 30.18 10 10 10 12 4 15 0.00  
20 60 44 28 40 33 26 92 70 47 30.20 30.07 29.97 10 10 10 16 9 21 0.00  
21 57 53 49 52 46 36 89 72 54 29.95 29.89 29.83 10 8 2 33 10 79 0.17 Rain
22 58 52 45 50 47 42 93 75 57 30.08 29.90 29.81 10 7 2 26 8 36 0.81 Rain , Thunderstorm
23 57 52 46 54 49 45 93 85 77 30.07 29.93 29.82 10 7 2 29 10 38 0.65 Rain
24 56 45 34 45 39 32 100 81 61 30.19 30.13 30.01 10 7 0 8 3 20 0.00 Fog
25 47 42 37 45 41 36 93 88 83 30.15 29.92 29.76 10 7 2 20 8 26 0.69 Rain
26 56 48 39 45 42 37 92 76 59 30.07 29.93 29.83 10 9 2 20 9 23 0.01 Rain
27 54 45 35 40 38 34 92 73 54 30.15 30.11 30.07 10 10 10 13 3 23 0.00  
28 47 40 33 39 36 32 96 83 70 30.17 30.10 30.03 10 10 10 17 6 22 0.00  
29 55 45 34 42 38 32 92 73 54 30.06 30.02 30.00 10 10 10 13 4 16 T  
30 58 45 32 40 33 28 96 66 36 30.14 30.07 30.04 10 10 10 14 3 23 0.00  
31 52 40 27 38 29 25 82 62 41 30.28 30.22 30.17 10 10 10 10 4 10 0.00