Weather History for Chatham, MA

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Month of December, 2013

  Max Avg Min Sum
Temperature  
Max Temperature 55 °F 42 °F 28 °F
Mean Temperature 50 °F 36 °F 23 °F
Min Temperature 45 °F 29 °F 16 °F
Degree Days  
Heating Degree Days (base 65) 42 29 16 911
Cooling Degree Days (base 65) 0 0 0 0
Growing Degree Days (base 50) 0 0 0 0
Dew Point  
Dew Point 55 °F 30 °F 2 °F
Precipitation  
Precipitation 0.94 in 0.13 in 0.00 in 3.90 in
Snowdepth - - - -
Wind  
Wind 28 mph 7 mph 0 mph
Gust Wind 40 mph 21 mph 16 mph
Sea Level Pressure  
Sea Level Pressure 30.58 in 30.07 in 29.31 in

Monthly Weather History Graph

Monthly Weather History Graph

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Date:

Astronomy

Dec. 18, 2013 Rise Set
Actual Time 7:02 AM EST 4:11 PM EST
Civil Twilight 6:30 AM EST 4:42 PM EST
Nautical Twilight 5:55 AM EST 5:18 PM EST
Astronomical Twilight 5:21 AM EST 5:51 PM EST
Moon 5:41 PM EST 7:38 AM EST
Length of Visible Light 10h 12m
Length of Day
9h 09m
Full, 98% of the Moon is Illuminated
Dec 18
Full
Dec 25
Last Quarter
Jan 1
New
Jan 7
First Quarter
Jan 15
Full

Weather History Calendar

Precipitation Actual month total 3.90 Average Month Total: 3.79
Sunday Monday Tuesday Wednesday Thursday Friday Saturday
Rain
Actual:
48 | 37 0.25
Average:
45 | 33 0.11
Fog
Actual:
46 | 39 0.00
Average:
44 | 32 0.11
Partly Cloudy
Actual:
45 | 33 0.00
Average:
44 | 32 0.11
Clear
Actual:
44 | 30 0.00
Average:
44 | 32 0.11
Rain
Actual:
52 | 32 0.00
Average:
44 | 32 0.12
Rain
Actual:
55 | 39 0.31
Average:
44 | 32 0.12
Rain
Actual:
41 | 34 0.27
Average:
44 | 32 0.12
Partly Cloudy
Actual:
35 | 28 0.00
Average:
44 | 31 0.12
Snow
Actual:
48 | 34 0.32
Average:
44 | 31 0.12
Snow
Actual:
39 | 28 0.19
Average:
44 | 31 0.12
Scattered Clouds
Actual:
34 | 25 0.00
Average:
44 | 31 0.13
Scattered Clouds
Actual:
28 | 18 0.00
Average:
43 | 31 0.13
Scattered Clouds
Actual:
32 | 16 0.00
Average:
43 | 30 0.13
Snow
Actual:
33 | 21 0.04
Average:
43 | 30 0.13
Snow
Actual:
51 | 27 0.56
Average:
43 | 30 0.13
Scattered Clouds
Actual:
32 | 23 0.00
Average:
42 | 29 0.13
Snow
Actual:
43 | 16 0.11
Average:
42 | 29 0.13
Snow
Actual:
39 | 28 0.01
Average:
42 | 29 0.13
Scattered Clouds
Actual:
45 | 28 0.00
Average:
41 | 28 0.13
Clear
Actual:
48 | 33 0.00
Average:
41 | 28 0.13
Rain
Actual:
50 | 45 0.00
Average:
40 | 27 0.13
Rain
Actual:
54 | 45 0.01
Average:
40 | 27 0.12
Rain
Actual:
48 | 39 0.37
Average:
40 | 27 0.12
Snow
Actual:
41 | 28 0.28
Average:
39 | 26 0.12
Snow
Actual:
30 | 19 0.00
Average:
39 | 26 0.12
Rain
Actual:
39 | 21 0.23
Average:
39 | 26 0.12
Clear
Actual:
37 | 27 0.00
Average:
39 | 26 0.12
Scattered Clouds
Actual:
46 | 28 0.00
Average:
39 | 26 0.12
Rain
Actual:
52 | 37 0.94
Average:
39 | 26 0.12
Partly Cloudy
Actual:
44 | 27 0.00
Average:
39 | 26 0.12
Snow
Actual:
28 | 19 0.01
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

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 48 42 37 47 41 27 96 83 65 30.46 30.15 29.97 10 9 2 12 8 21 0.25 Rain
2 46 42 39 46 41 36 100 93 82 29.98 29.96 29.90 10 5 0 7 3 - 0.00 Fog
3 45 40 33 39 38 31 93 86 79 29.93 29.86 29.81 10 9 2 9 5 22 0.00  
4 44 37 30 33 29 26 92 75 49 30.23 30.10 29.95 10 9 3 9 4 17 0.00  
5 52 42 32 51 45 29 97 90 80 30.23 30.10 29.99 10 6 0 10 5 20 0.00 Fog , Rain
6 55 47 39 55 46 36 100 93 82 30.11 29.99 29.93 10 4 0 13 8 23 0.31 Fog , Rain
7 41 38 34 37 32 17 97 82 48 30.44 30.17 30.05 10 7 2 10 6 21 0.27 Rain
8 35 32 28 21 18 16 69 56 46 30.58 30.53 30.45 10 10 10 8 3 - 0.00  
9 48 41 34 47 38 25 100 91 70 30.48 30.11 29.85 10 4 1 21 11 34 0.32 Rain , Snow
10 39 34 28 36 30 18 96 88 65 30.01 29.86 29.79 10 5 0 10 5 24 0.19 Fog , Snow
11 34 30 25 19 17 13 75 60 43 30.26 30.18 30.04 10 10 10 15 9 24 0.00  
12 28 23 18 17 8 2 66 51 37 30.25 30.20 30.13 10 10 10 12 6 24 0.00  
13 32 24 16 15 9 4 63 51 38 30.35 30.13 30.03 10 10 10 12 5 23 0.00  
14 33 27 21 31 19 7 92 74 53 30.57 30.45 30.17 10 4 0 21 9 33 0.04 Fog , Snow
15 51 39 27 49 36 20 100 90 66 30.14 29.65 29.31 10 5 0 28 17 40 0.56 Fog , Rain , Snow
16 32 28 23 21 11 5 72 51 35 30.22 29.99 29.79 10 10 10 15 7 25 0.00  
17 43 30 16 41 25 5 97 79 39 30.28 30.05 29.83 10 7 0 15 7 25 0.11 Fog , Rain , Snow
18 39 34 28 37 28 19 93 82 56 30.11 29.87 29.75 10 7 0 17 9 32 0.01 Fog , Snow
19 45 36 28 35 28 20 76 67 58 30.14 30.09 30.01 10 10 10 14 7 24 0.00  
20 48 40 33 43 38 29 93 84 76 30.16 30.08 30.00 10 9 6 12 5 22 0.00  
21 50 48 45 46 45 43 97 93 83 30.05 30.00 29.96 7 4 1 13 9 24 0.00 Rain
22 54 50 45 52 48 44 100 96 93 30.02 29.95 29.90 10 3 0 14 9 26 0.01 Fog , Rain
23 48 44 39 46 43 37 97 93 92 30.06 30.02 29.94 10 5 1 8 2 - 0.37 Rain
24 41 34 28 39 31 18 97 84 56 30.17 30.09 30.00 10 7 0 12 7 23 0.28 Fog , Rain , Snow
25 30 24 19 18 14 9 78 66 49 30.55 30.43 30.19 10 8 2 13 8 25 0.00 Snow
26 39 30 21 36 29 16 96 84 62 30.51 30.23 30.06 10 8 2 10 4 21 0.23 Rain
27 37 32 27 24 20 18 85 66 50 30.29 30.26 30.22 10 10 10 10 5 20 0.00  
28 46 37 28 35 30 20 89 71 56 30.26 30.15 30.04 10 10 10 16 7 33 0.00  
29 52 44 37 50 43 36 97 92 82 30.07 29.66 29.31 10 5 1 20 8 36 0.94 Rain
30 44 36 27 40 29 12 93 73 46 30.14 29.82 29.41 10 10 8 15 9 28 0.00  
31 28 24 19 23 17 6 88 70 41 30.18 30.10 30.03 10 7 1 9 6 20 0.01 Snow