Weather History for Seattle, WA

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Month of December, 2012

  Max Avg Min Sum
Temperature  
Max Temperature 56 °F 45 °F 38 °F
Mean Temperature 52 °F 42 °F 34 °F
Min Temperature 47 °F 38 °F 29 °F
Degree Days  
Heating Degree Days (base 65) 31 23 13 724
Cooling Degree Days (base 65) 0 0 0 0
Growing Degree Days (base 50) 0 0 0 0
Dew Point  
Dew Point 48 °F 36 °F 25 °F
Precipitation  
Precipitation 0.89 in 0.23 in 0.00 in 6.85 in
Snowdepth 1.0 in 0.0 in 0.0 in -
Wind  
Wind 38 mph 9 mph 0 mph
Gust Wind 59 mph 24 mph 17 mph
Sea Level Pressure  
Sea Level Pressure 30.48 in 29.91 in 28.95 in

Monthly Weather History Graph

Monthly Weather History Graph

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Date:

Astronomy

Dec. 21, 2012 Rise Set
Actual Time 7:54 AM PST 4:21 PM PST
Civil Twilight 7:18 AM PST 4:57 PM PST
Nautical Twilight 6:39 AM PST 5:36 PM PST
Astronomical Twilight 6:01 AM PST 6:13 PM PST
Moon 12:26 PM PST (12/21) 1:29 AM PST (12/21)
Length of Visible Light 9h 38m
Length of Day
8h 26m
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

Weather History Calendar

Precipitation Actual month total 6.85 Normal Month Total: 5.35
Sunday Monday Tuesday Wednesday Thursday Friday Saturday
 
Rain
Actual:
56 | 47 0.16
Average:
47 | 37 0.20
Rain
Actual:
47 | 45 0.77
Average:
47 | 37 0.20
Rain
Actual:
49 | 45 0.51
Average:
47 | 36 0.20
Rain
Actual:
53 | 45 0.56
Average:
47 | 36 0.19
Rain
Actual:
48 | 40 0.06
Average:
47 | 36 0.19
Rain
Actual:
45 | 43 0.06
Average:
46 | 36 0.18
Rain
Actual:
46 | 38 0.04
Average:
46 | 36 0.19
Mostly Cloudy
Actual:
44 | 38 0.00
Average:
46 | 36 0.18
Rain
Actual:
44 | 37 0.06
Average:
46 | 36 0.17
Fog
Actual:
45 | 42 0.02
Average:
46 | 36 0.17
Rain
Actual:
46 | 42 0.12
Average:
46 | 35 0.17
Rain
Actual:
44 | 40 0.32
Average:
46 | 35 0.16
Rain
Actual:
45 | 38 0.09
Average:
46 | 35 0.17
Rain
Actual:
43 | 34 0.31
Average:
45 | 35 0.17
Rain
Actual:
40 | 33 0.21
Average:
45 | 35 0.16
Rain
Actual:
44 | 38 0.89
Average:
45 | 35 0.17
Rain
Actual:
47 | 35 0.08
Average:
45 | 35 0.16
Snow
Actual:
39 | 33 0.13
Average:
45 | 35 0.16
Snow
Actual:
47 | 35 0.54
Average:
45 | 35 0.17
Rain
Actual:
45 | 33 0.52
Average:
45 | 35 0.16
Rain
Actual:
47 | 29 0.07
Average:
45 | 35 0.17
Rain
Actual:
47 | 39 0.13
Average:
45 | 35 0.17
Rain
Actual:
45 | 38 0.26
Average:
45 | 35 0.17
Rain
Actual:
42 | 37 0.01
Average:
45 | 35 0.17
Snow
Actual:
42 | 37 0.53
Average:
45 | 35 0.17
Rain
Actual:
44 | 38 0.18
Average:
45 | 36 0.17
Rain
Actual:
46 | 38 0.16
Average:
45 | 36 0.17
Rain
Actual:
47 | 39 T
Average:
45 | 36 0.16
Rain
Actual:
41 | 38 0.06
Average:
45 | 36 0.16
Fog
Actual:
40 | 32 0.00
Average:
45 | 36 0.16
Partly Cloudy
Actual:
38 | 30 0.00
Average:
46 | 36 0.16
 

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 56 52 47 46 40 35 93 74 54 29.66 29.53 29.29 10 10 7 25 12 38 0.16 Rain
2 47 46 45 43 41 39 92 84 76 29.83 29.51 29.19 10 9 3 26 14 36 0.77 Rain
3 49 47 45 45 42 41 93 85 77 30.03 29.91 29.67 10 9 4 21 10 33 0.51 Rain
4 53 49 45 48 43 39 89 80 71 29.88 29.72 29.53 10 8 3 25 14 33 0.56 Rain
5 48 44 40 39 37 35 82 74 65 30.23 30.14 29.87 10 10 6 22 11 29 0.06 Rain
6 45 44 43 40 38 36 89 83 76 30.20 30.12 30.05 10 10 6 21 11 26 0.06 Rain
7 46 42 38 40 37 32 89 80 71 30.17 30.06 29.97 10 10 9 23 10 31 0.04 Rain
8 44 41 38 35 33 32 82 75 67 30.37 30.26 30.16 10 10 10 12 4 14 0.00  
9 44 41 37 41 38 33 96 88 79 30.40 30.34 30.28 10 5 0 9 5 13 0.06 Fog , Rain
10 45 44 42 43 41 39 96 93 89 30.44 30.34 30.13 10 4 0 13 4 18 0.02 Fog
11 46 44 42 40 39 37 89 83 76 30.09 29.77 29.57 10 10 6 20 10 25 0.12 Rain
12 44 42 40 39 38 37 89 86 82 30.05 29.84 29.62 10 8 3 13 5 17 0.32 Rain
13 45 42 38 37 35 32 92 79 65 30.07 29.97 29.83 10 10 8 13 6 14 0.09 Rain
14 43 39 34 38 35 31 92 81 70 29.97 29.89 29.78 10 7 0 12 4 14 0.31 Fog , Rain
15 40 37 33 36 32 27 89 80 70 29.92 29.70 29.55 10 9 3 22 11 29 0.21 Rain
16 44 41 38 40 35 33 92 86 79 29.77 29.52 28.99 10 9 5 23 12 30 0.89 Rain
17 47 41 35 41 34 29 89 76 62 29.91 29.50 28.95 10 10 6 38 21 59 0.08 Rain
18 39 36 33 32 30 27 89 80 70 30.01 29.95 29.87 10 8 1 20 12 25 0.13 Snow
19 47 41 35 39 33 26 89 75 60 29.96 29.73 29.57 10 8 2 28 13 38 0.54 Rain , Snow
20 45 39 33 40 36 30 92 84 76 29.85 29.68 29.53 10 9 5 22 8 29 0.52 Rain
21 47 38 29 36 33 28 92 78 64 29.83 29.76 29.68 10 10 9 14 4 18 0.07 Rain
22 47 43 39 40 36 33 89 75 60 29.76 29.61 29.52 10 9 1 25 8 35 0.13 Rain
23 45 42 38 38 35 32 92 80 67 29.84 29.73 29.64 10 9 6 13 6 16 0.26 Rain
24 42 40 37 39 36 34 92 89 85 30.19 30.08 29.87 10 10 7 14 6 18 0.01 Rain
25 42 40 37 34 32 30 85 74 62 30.04 29.77 29.66 10 9 5 20 9 26 0.53 Rain , Snow
26 44 41 38 40 36 30 86 76 65 29.93 29.81 29.72 10 10 7 21 11 29 0.18 Rain
27 46 42 38 39 37 33 93 82 70 30.19 30.09 29.95 10 9 2 17 7 22 0.16 Rain
28 47 43 39 37 34 30 79 70 60 30.18 30.15 30.13 10 10 10 9 4 12 T Rain
29 41 40 38 36 33 28 92 78 64 30.25 30.19 30.15 10 9 4 9 4 13 0.06 Rain
30 40 36 32 36 33 30 96 88 79 30.34 30.30 30.22 10 3 0 9 4 12 0.00 Fog
31 38 34 30 33 29 25 92 82 72 30.48 30.34 30.27 10 9 1 15 5 18 0.00