Weather History for Napa County, CA

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Month of September, 2012

  Max Avg Min Sum
Temperature  
Max Temperature 93 °F 77 °F 69 °F
Mean Temperature 70 °F 63 °F 58 °F
Min Temperature 55 °F 48 °F 41 °F
Degree Days  
Heating Degree Days (base 65) 7 3 0 80
Cooling Degree Days (base 65) 5 0 0 15
Growing Degree Days (base 50) 18 12 8 366
Dew Point  
Dew Point 57 °F 50 °F 39 °F
Precipitation  
Precipitation 0.00 in 0.00 in 0.00 in 0.00 in
Snowdepth - - - -
Wind  
Wind 59 mph 6 mph 0 mph
Gust Wind 115 mph 30 mph 18 mph
Sea Level Pressure  
Sea Level Pressure 30.12 in 29.95 in 29.78 in

Monthly Weather History Graph

Monthly Weather History Graph

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Date:

Astronomy

Sep. 11, 2012 Rise Set
Actual Time 6:47 AM PDT 7:22 PM PDT
Civil Twilight 6:21 AM PDT 7:49 PM PDT
Nautical Twilight 5:49 AM PDT 8:20 PM PDT
Astronomical Twilight 5:17 AM PDT 8:52 PM PDT
Moon 2:13 AM PDT (9/11) 4:33 PM PDT (9/11)
Length of Visible Light 13h 27m
Length of Day
12h 34m
Waning Crescent, 20% of the Moon is Illuminated
Sep 11
Waning Crescent
Sep 15
New
Sep 22
First Quarter
Sep 29
Full
Oct 8
Last Quarter

Weather History Calendar

Precipitation Actual month total 0.00 Average Month Total: 0.30
Sunday Monday Tuesday Wednesday Thursday Friday Saturday
 
Partly Cloudy
Actual:
69 | 53 0.00
Average:
84 | 54 0.00
Fog
Actual:
86 | 47 0.00
Average:
83 | 54 0.00
Clear
Actual:
87 | 48 0.00
Average:
83 | 54 0.00
Fog
Actual:
76 | 48 0.00
Average:
84 | 53 0.00
Fog
Actual:
73 | 49 0.00
Average:
85 | 54 0.00
Clear
Actual:
75 | 50 0.00
Average:
83 | 54 0.00
Clear
Actual:
79 | 48 0.00
Average:
84 | 54 0.00
Clear
Actual:
76 | 50 0.00
Average:
84 | 54 0.00
Scattered Clouds
Actual:
80 | 44 0.00
Average:
84 | 53 0.01
Partly Cloudy
Actual:
83 | 55 0.00
Average:
82 | 53 0.02
Scattered Clouds
Actual:
76 | 52 0.00
Average:
81 | 53 0.00
Fog
Actual:
76 | 50 0.00
Average:
83 | 52 0.00
Clear
Actual:
81 | 50 0.00
Average:
82 | 53 0.00
Scattered Clouds
Actual:
75 | 51 0.00
Average:
80 | 52 0.00
Fog
Actual:
76 | 49 0.00
Average:
81 | 51 0.00
Fog
Actual:
75 | 43 0.00
Average:
81 | 52 0.05
Scattered Clouds
Actual:
72 | 47 0.00
Average:
81 | 53 0.03
Partly Cloudy
Actual:
75 | 47 0.00
Average:
80 | 53 0.01
Fog
Actual:
73 | 42 0.00
Average:
81 | 52 0.03
Clear
Actual:
74 | 43 0.00
Average:
82 | 51 0.00
Clear
Actual:
78 | 41 0.00
Average:
83 | 52 0.00
Fog
Actual:
82 | 43 0.00
Average:
82 | 52 0.00
Clear
Actual:
83 | 46 0.00
Average:
83 | 51 0.01
Partly Cloudy
Actual:
76 | 48 0.00
Average:
83 | 51 0.03
Scattered Clouds
Actual:
73 | 47 0.00
Average:
83 | 53 0.01
Partly Cloudy
Actual:
70 | 53 0.00
Average:
81 | 54 0.03
Fog
Actual:
81 | 46 0.00
Average:
81 | 52 0.01
Scattered Clouds
Actual:
69 | 47 0.00
Average:
83 | 52 0.02
Partly Cloudy
Actual:
77 | 52 0.00
Average:
83 | 53 0.01
Clear
Actual:
93 | 46 0.00
Average:
83 | 51 0.03
 

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
Sep high avg low high avg low high avg low high avg low high avg low high avg high sum  
1 69 61 53 54 52 50 93 75 57 30.02 29.97 29.94 10 10 9 59 6 115 0.00  
2 86 67 47 56 52 45 100 63 25 30.00 29.95 29.86 10 5 0 13 5 24 0.00 Fog
3 87 68 48 55 51 40 93 56 19 29.95 29.91 29.86 10 10 9 14 5 24 0.00  
4 76 62 48 55 51 46 100 73 46 30.03 29.98 29.91 10 6 0 20 5 - 0.00 Fog
5 73 61 49 54 51 48 100 77 53 30.00 29.95 29.89 10 8 0 18 7 26 0.00 Fog
6 75 63 50 54 50 47 93 70 46 30.00 29.95 29.91 10 10 10 15 9 22 0.00  
7 79 64 48 54 49 45 93 66 39 30.07 30.01 29.96 10 10 10 18 7 25 0.00  
8 76 63 50 54 50 47 93 65 36 30.04 29.98 29.91 10 10 10 18 8 35 0.00  
9 80 62 44 54 49 43 100 69 37 29.98 29.92 29.84 10 10 10 18 9 23 0.00  
10 83 69 55 55 53 50 93 64 34 29.94 29.86 29.78 10 10 10 15 6 18 0.00  
11 76 64 52 56 54 51 93 70 46 29.95 29.87 29.82 10 9 6 22 7 59 0.00  
12 76 63 50 56 53 48 100 75 50 30.08 30.00 29.93 10 6 0 16 6 62 0.00 Fog
13 81 66 50 57 52 48 93 69 45 30.08 30.02 29.96 10 10 10 21 6 85 0.00  
14 75 63 51 56 52 47 93 72 50 30.08 30.03 29.96 10 10 10 16 7 26 0.00  
15 76 63 49 55 50 47 96 71 46 30.11 30.04 29.95 10 8 0 10 7 29 0.00 Fog
16 75 59 43 53 49 42 100 71 41 30.06 30.00 29.93 10 9 0 13 5 35 0.00 Fog
17 72 60 47 52 49 46 93 71 49 30.07 30.00 29.94 10 10 9 16 9 20 0.00  
18 75 61 47 52 48 45 89 64 38 30.12 30.04 29.97 10 10 8 17 8 20 0.00  
19 73 58 42 53 47 41 100 73 46 30.11 30.05 29.99 10 6 0 16 6 20 0.00 Fog
20 74 59 43 52 48 42 93 70 46 30.06 30.00 29.93 10 9 2 17 5 21 0.00  
21 78 60 41 53 48 39 96 67 37 29.98 29.93 29.85 10 9 1 13 4 24 0.00  
22 82 63 43 52 47 41 100 66 31 29.92 29.88 29.83 10 8 0 13 3 15 0.00 Fog
23 83 65 46 55 51 44 93 65 36 29.94 29.90 29.87 10 10 10 17 7 20 0.00  
24 76 62 48 56 51 46 96 71 46 29.97 29.90 29.84 10 10 7 13 6 15 0.00  
25 73 60 47 55 52 46 100 79 57 29.93 29.87 29.81 10 9 2 18 6 22 0.00  
26 70 62 53 54 52 51 93 75 57 29.91 29.86 29.80 10 8 6 14 6 - 0.00  
27 81 64 46 57 51 45 100 70 39 29.94 29.87 29.79 10 6 0 12 4 20 0.00 Fog
28 69 58 47 55 51 47 100 80 59 29.97 29.90 29.85 10 10 3 17 7 20 0.00  
29 77 65 52 55 52 50 96 71 46 30.05 29.99 29.93 10 9 2 12 5 14 0.00  
30 93 70 46 55 50 44 100 62 23 30.04 29.99 29.92 10 10 10 9 3 10 0.00