Weather History for Chatham, MA

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Month of December, 2011

  Max Avg Min Sum
Temperature  
Max Temperature 59 °F 48 °F 32 °F
Mean Temperature 55 °F 40 °F 28 °F
Min Temperature 53 °F 33 °F 19 °F
Degree Days  
Heating Degree Days (base 65) 36 25 10 768
Cooling Degree Days (base 65) 0 0 0 0
Growing Degree Days (base 50) 5 0 0 11
Dew Point  
Dew Point 58 °F 35 °F 2 °F
Precipitation  
Precipitation 0.89 in 0.09 in 0.00 in 2.76 in
Snowdepth - - - -
Wind  
Wind 21 mph 6 mph 0 mph
Gust Wind 40 mph 20 mph 16 mph
Sea Level Pressure  
Sea Level Pressure 30.68 in 30.12 in 29.14 in

Monthly Weather History Graph

Monthly Weather History Graph

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Date:

Astronomy

Dec. 25, 2011 Rise Set
Actual Time 7:05 AM EST 4:14 PM EST
Civil Twilight 6:33 AM EST 4:46 PM EST
Nautical Twilight 5:58 AM EST 5:21 PM EST
Astronomical Twilight 5:24 AM EST 5:55 PM EST
Moon 7:40 AM EST (12/25) 5:32 PM EST (12/25)
Length of Visible Light 10h 12m
Length of Day
9h 09m
New Moon, 1% of the Moon is Illuminated
Dec 25
New Moon
Jan 1
First Quarter
Jan 9
Full
Jan 16
Last Quarter
Jan 23
New

Weather History Calendar

Precipitation Actual month total 2.76 Average Month Total: 3.79
Sunday Monday Tuesday Wednesday Thursday Friday Saturday
 
Partly Cloudy
Actual:
46 | 34 0.00
Average:
45 | 33 0.11
Scattered Clouds
Actual:
50 | 33 0.00
Average:
44 | 32 0.11
Partly Cloudy
Actual:
45 | 35 0.00
Average:
44 | 32 0.11
Partly Cloudy
Actual:
51 | 32 0.01
Average:
44 | 32 0.11
Fog
Actual:
57 | 46 0.01
Average:
44 | 32 0.12
Rain
Actual:
57 | 50 0.09
Average:
44 | 32 0.12
Rain
Actual:
57 | 53 0.89
Average:
44 | 32 0.12
Rain
Actual:
59 | 30 0.17
Average:
44 | 31 0.12
Scattered Clouds
Actual:
51 | 28 0.00
Average:
44 | 31 0.12
Rain
Actual:
48 | 35 0.05
Average:
44 | 31 0.12
Scattered Clouds
Actual:
37 | 28 0.00
Average:
44 | 31 0.13
Clear
Actual:
48 | 28 0.00
Average:
43 | 31 0.13
Partly Cloudy
Actual:
46 | 36 0.00
Average:
43 | 30 0.13
Overcast
Actual:
44 | 36 0.00
Average:
43 | 30 0.13
Rain
Actual:
53 | 34 0.07
Average:
43 | 30 0.13
Scattered Clouds
Actual:
52 | 39 0.00
Average:
42 | 29 0.13
Snow
Actual:
44 | 30 0.00
Average:
42 | 29 0.13
Snow
Actual:
32 | 24 0.01
Average:
42 | 29 0.13
Partly Cloudy
Actual:
48 | 19 0.11
Average:
41 | 28 0.13
Partly Cloudy
Actual:
46 | 26 0.00
Average:
41 | 28 0.13
Rain
Actual:
53 | 33 0.10
Average:
40 | 27 0.13
Rain
Actual:
55 | 42 0.06
Average:
40 | 27 0.12
Rain
Actual:
46 | 36 0.54
Average:
40 | 27 0.12
Partly Cloudy
Actual:
35 | 28 0.00
Average:
39 | 26 0.12
Rain
Actual:
45 | 21 0.17
Average:
39 | 26 0.12
Rain
Actual:
42 | 27 0.03
Average:
39 | 26 0.12
Rain
Actual:
52 | 27 0.13
Average:
39 | 26 0.12
Rain
Actual:
53 | 30 0.10
Average:
39 | 26 0.12
Clear
Actual:
32 | 25 0.00
Average:
39 | 26 0.12
Scattered Clouds
Actual:
46 | 25 0.00
Average:
39 | 26 0.12
Rain
Actual:
50 | 39 0.22
Average:
38 | 25 0.12
 

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 46 40 34 36 34 32 92 72 61 30.27 30.08 29.86 10 10 3 12 4 21 0.00  
2 50 42 33 39 35 28 93 73 48 30.42 30.32 30.28 10 10 10 9 4 - 0.00  
3 45 40 35 34 32 30 89 70 58 30.68 30.59 30.43 10 10 8 12 6 18 0.00  
4 51 42 32 47 39 30 97 86 68 30.63 30.56 30.44 10 10 5 9 3 18 0.01  
5 57 52 46 55 50 46 100 96 88 30.43 30.35 30.27 10 6 0 8 4 - 0.01 Fog
6 57 54 50 54 53 49 100 97 89 30.25 30.09 29.95 10 8 2 9 5 21 0.09 Rain
7 57 55 53 57 54 52 100 100 94 29.93 29.75 29.41 10 3 0 12 6 22 0.89 Fog , Rain
8 59 46 30 58 38 24 100 78 45 30.30 29.71 29.14 10 8 3 20 12 40 0.17 Rain
9 51 40 28 45 36 24 89 79 61 30.40 30.32 30.22 10 10 10 10 4 22 0.00  
10 48 42 35 45 33 16 97 70 46 30.41 30.23 30.14 10 10 8 9 3 20 0.05 Rain
11 37 32 28 24 19 14 75 57 46 30.64 30.58 30.43 10 10 10 6 3 - 0.00  
12 48 38 28 39 33 23 97 76 63 30.61 30.54 30.42 10 10 10 8 4 16 0.00  
13 46 41 36 40 34 21 97 74 36 30.39 30.31 30.25 10 10 9 13 3 20 0.00  
14 44 40 36 36 33 28 76 69 60 30.43 30.35 30.29 10 10 10 8 4 - 0.00  
15 53 44 34 50 43 29 96 84 70 30.36 30.03 29.78 10 9 3 16 8 29 0.07 Rain
16 52 46 39 50 35 27 96 64 41 30.07 29.91 29.70 10 9 6 16 9 28 0.00  
17 44 37 30 33 30 23 96 76 57 30.08 30.05 29.99 10 8 1 13 4 24 0.00 Snow
18 32 29 24 30 23 11 100 79 53 30.27 30.15 30.06 10 6 0 12 7 22 0.01 Fog , Snow
19 48 34 19 39 28 10 76 67 51 30.27 30.06 29.88 10 10 10 18 7 34 0.11  
20 46 36 26 34 25 15 81 60 36 30.25 30.09 29.88 10 10 10 14 8 25 0.00  
21 53 43 33 53 47 27 100 91 70 30.24 29.94 29.70 10 6 1 16 10 28 0.10 Rain
22 55 48 42 54 44 38 100 81 55 30.11 29.91 29.66 10 9 2 14 9 24 0.06 Rain
23 46 42 36 44 40 25 96 89 64 30.15 29.93 29.80 10 8 3 13 5 21 0.54 Rain
24 35 32 28 26 18 15 73 61 52 30.48 30.36 30.17 10 10 10 10 7 18 0.00  
25 45 33 21 39 28 17 100 76 57 30.49 30.24 29.91 10 9 2 10 3 18 0.17 Rain
26 42 34 27 37 31 22 97 78 59 30.26 30.01 29.82 10 10 8 13 5 24 0.03 Rain
27 52 40 27 50 39 23 96 82 70 30.21 29.95 29.48 10 9 3 17 7 40 0.13 Rain
28 53 42 30 54 41 16 100 82 52 29.64 29.39 29.32 10 8 2 21 14 38 0.10 Rain
29 32 28 25 16 9 2 61 43 28 30.04 29.87 29.66 10 10 10 14 10 26 0.00  
30 46 36 25 45 32 11 93 75 43 30.13 30.10 30.06 10 10 10 14 4 18 0.00  
31 50 44 39 50 46 39 100 97 89 30.06 29.86 29.77 10 4 1 12 5 24 0.22 Rain