Weather History for Napa County, CA

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Month of December, 2013

  Max Avg Min Sum
Temperature  
Max Temperature 68 °F 59 °F 45 °F
Mean Temperature 51 °F 44 °F 33 °F
Min Temperature 35 °F 28 °F 16 °F
Degree Days  
Heating Degree Days (base 65) 32 21 14 666
Cooling Degree Days (base 65) 0 0 0 0
Growing Degree Days (base 50) 2 0 0 2
Dew Point  
Dew Point 53 °F 31 °F 6 °F
Precipitation  
Precipitation 0.47 in 0.02 in 0.00 in 0.47 in
Snowdepth - - - -
Wind  
Wind 28 mph 5 mph 0 mph
Gust Wind 45 mph 22 mph 16 mph
Sea Level Pressure  
Sea Level Pressure 30.42 in 30.15 in 29.76 in

Monthly Weather History Graph

Monthly Weather History Graph

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Date:

Astronomy

Dec. 12, 2013 Rise Set
Actual Time 7:16 AM PST 4:49 PM PST
Civil Twilight 6:47 AM PST 5:18 PM PST
Nautical Twilight 6:14 AM PST 5:52 PM PST
Astronomical Twilight 5:41 AM PST 6:24 PM PST
Moon 1:57 PM PST (12/12) 2:47 AM PST (12/12)
Length of Visible Light 10h 31m
Length of Day
9h 32m
Waxing Gibbous, 81% of the Moon is Illuminated
Dec 12
Waxing Gibbous
Dec 17
Full
Dec 25
Last Quarter
Jan 1
New
Jan 7
First Quarter

Weather History Calendar

Precipitation Actual month total 0.47 Average Month Total: 3.63
Sunday Monday Tuesday Wednesday Thursday Friday Saturday
Clear
Actual:
68 | 34 0.00
Average:
61 | 39 0.09
Fog
Actual:
64 | 30 0.00
Average:
60 | 39 0.21
Partly Cloudy
Actual:
56 | 29 0.00
Average:
60 | 41 0.18
Clear
Actual:
53 | 24 0.00
Average:
59 | 39 0.13
Clear
Actual:
49 | 16 0.00
Average:
60 | 40 0.11
Rain
Actual:
48 | 20 0.47
Average:
60 | 41 0.09
Clear
Actual:
48 | 28 0.00
Average:
60 | 41 0.10
Clear
Actual:
45 | 23 0.00
Average:
60 | 42 0.12
Clear
Actual:
49 | 19 0.00
Average:
59 | 39 0.12
Clear
Actual:
53 | 21 0.00
Average:
59 | 39 0.13
Clear
Actual:
56 | 25 0.00
Average:
57 | 38 0.12
Clear
Actual:
58 | 26 0.00
Average:
57 | 37 0.05
Clear
Actual:
56 | 24 0.00
Average:
56 | 38 0.03
Clear
Actual:
60 | 25 0.00
Average:
57 | 38 0.12
Clear
Actual:
62 | 28 0.00
Average:
57 | 39 0.10
Clear
Actual:
64 | 34 0.00
Average:
57 | 38 0.09
Clear
Actual:
64 | 35 0.00
Average:
58 | 38 0.15
Clear
Actual:
59 | 33 0.00
Average:
56 | 37 0.08
Fog
Actual:
63 | 30 0.00
Average:
57 | 37 0.15
Clear
Actual:
59 | 29 0.00
Average:
54 | 36 0.16
Clear
Actual:
63 | 31 0.00
Average:
54 | 37 0.16
Clear
Actual:
63 | 31 0.00
Average:
54 | 36 0.13
Clear
Actual:
64 | 32 0.00
Average:
54 | 35 0.12
Clear
Actual:
65 | 33 0.00
Average:
55 | 36 0.18
Clear
Actual:
65 | 30 0.00
Average:
55 | 37 0.11
Clear
Actual:
67 | 28 0.00
Average:
55 | 36 0.05
Clear
Actual:
61 | 30 0.00
Average:
54 | 37 0.10
Clear
Actual:
62 | 24 0.00
Average:
56 | 36 0.14
Clear
Actual:
64 | 28 0.00
Average:
56 | 38 0.15
Clear
Actual:
63 | 27 0.00
Average:
56 | 36 0.11
Clear
Actual:
59 | 30 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

2013 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 68 51 34 45 40 34 100 70 39 30.32 30.25 30.19 10 8 2 8 1 23 0.00  
2 64 47 30 53 40 30 100 78 56 30.20 30.10 29.92 10 6 0 17 6 21 0.00 Fog
3 56 43 29 52 34 20 100 66 32 29.92 29.87 29.83 10 10 10 26 9 31 0.00  
4 53 39 24 22 15 6 75 46 16 30.07 30.01 29.93 10 10 10 17 6 21 0.00  
5 49 33 16 23 16 11 75 49 23 30.15 30.11 30.07 10 10 9 8 2 12 0.00  
6 48 34 20 46 34 20 93 71 49 30.18 30.04 29.88 10 8 2 21 6 25 0.47 Rain
7 48 38 28 43 29 20 100 66 31 30.25 30.07 29.89 10 10 10 23 10 40 0.00  
8 45 34 23 29 22 17 85 63 41 30.31 30.26 30.22 10 10 10 9 3 16 0.00  
9 49 34 19 24 19 15 84 55 26 30.42 30.36 30.30 10 10 10 17 5 22 0.00  
10 53 37 21 30 24 18 88 60 32 30.40 30.28 30.20 10 10 10 13 4 15 0.00  
11 56 41 25 31 27 23 92 64 35 30.24 30.20 30.16 10 10 10 18 7 23 0.00  
12 58 42 26 37 30 24 92 66 40 30.26 30.20 30.15 10 10 9 13 3 18 0.00  
13 56 40 24 36 30 25 100 72 43 30.33 30.26 30.22 10 9 2 6 1 10 0.00  
14 60 43 25 37 32 25 100 70 40 30.39 30.33 30.29 10 9 6 18 5 22 0.00  
15 62 45 28 38 32 27 92 64 36 30.36 30.30 30.23 10 8 2 14 5 25 0.00  
16 64 49 34 37 35 32 92 63 34 30.23 30.16 30.11 10 10 9 28 9 45 0.00  
17 64 50 35 39 36 32 92 66 39 30.17 30.09 30.02 10 8 5 15 6 28 0.00  
18 59 46 33 46 39 31 100 76 51 30.01 29.90 29.78 10 9 2 16 5 20 0.00  
19 63 47 30 39 29 9 100 60 20 29.91 29.83 29.76 10 7 0 22 7 30 0.00 Fog
20 59 44 29 32 23 10 70 45 19 30.00 29.95 29.91 10 10 2 12 3 14 0.00  
21 63 47 31 43 37 28 100 76 51 30.07 30.00 29.95 10 10 10 12 2 - 0.00  
22 63 47 31 41 35 32 100 68 36 30.27 30.19 30.08 10 9 5 14 3 24 0.00  
23 64 48 32 40 37 33 100 70 39 30.38 30.33 30.27 10 8 6 15 5 30 0.00  
24 65 49 33 42 37 32 100 72 43 30.32 30.25 30.18 10 8 5 10 3 39 0.00  
25 65 48 30 41 35 30 100 67 34 30.28 30.23 30.19 10 10 8 18 7 22 0.00  
26 67 48 28 38 33 29 100 63 26 30.24 30.20 30.14 10 10 10 17 6 21 0.00  
27 61 46 30 37 33 28 92 64 36 30.22 30.17 30.11 10 10 10 14 3 17 0.00  
28 62 43 24 36 31 25 100 66 32 30.14 30.07 30.01 10 10 10 9 3 13 0.00  
29 64 46 28 35 29 23 82 53 23 30.17 30.11 30.07 10 10 8 20 6 25 0.00  
30 63 45 27 35 31 25 89 62 34 30.24 30.20 30.17 10 10 7 13 4 21 0.00  
31 59 45 30 39 32 29 100 69 37 30.25 30.19 30.14 10 9 6 6 1 8 0.00