Weather History for Chatham, MA

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Month of September, 2013

  Max Avg Min Sum
Temperature  
Max Temperature 80 °F 71 °F 57 °F
Mean Temperature 74 °F 63 °F 51 °F
Min Temperature 69 °F 55 °F 45 °F
Degree Days  
Heating Degree Days (base 65) 14 4 0 126
Cooling Degree Days (base 65) 9 2 0 52
Growing Degree Days (base 50) 24 13 1 384
Dew Point  
Dew Point 72 °F 55 °F 36 °F
Precipitation  
Precipitation 0.72 in 0.05 in 0.00 in 1.44 in
Snowdepth - - - -
Wind  
Wind 15 mph 5 mph 0 mph
Gust Wind 26 mph 19 mph 16 mph
Sea Level Pressure  
Sea Level Pressure 30.39 in 30.02 in 29.60 in

Monthly Weather History Graph

Monthly Weather History Graph

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Date:

Astronomy

Sep. 21, 2013 Rise Set
Actual Time 6:26 AM EDT 6:38 PM EDT
Civil Twilight 5:58 AM EDT 7:06 PM EDT
Nautical Twilight 5:26 AM EDT 7:38 PM EDT
Astronomical Twilight 4:52 AM EDT 8:11 PM EDT
Moon 7:44 PM EDT (9/21) 8:44 AM EDT (9/21)
Length of Visible Light 13h 07m
Length of Day
12h 11m
Waning Gibbous, 94% of the Moon is Illuminated
Sep 21
Waning Gibbous
Sep 26
Last Quarter
Oct 4
New
Oct 11
First Quarter
Oct 18
Full

Weather History Calendar

Precipitation Actual month total 1.44 Average Month Total: 3.46
Sunday Monday Tuesday Wednesday Thursday Friday Saturday
Thunderstorm
Actual:
77 | 68 0.31
Average:
72 | 59 0.13
Fog
Actual:
80 | 66 0.01
Average:
72 | 59 0.13
Thunderstorm
Actual:
80 | 64 0.72
Average:
71 | 59 0.13
Clear
Actual:
78 | 62 0.00
Average:
71 | 58 0.13
Rain
Actual:
77 | 54 0.02
Average:
71 | 58 0.13
Clear
Actual:
66 | 52 0.00
Average:
71 | 58 0.13
Clear
Actual:
73 | 55 0.00
Average:
71 | 58 0.13
Partly Cloudy
Actual:
78 | 59 0.00
Average:
70 | 58 0.13
Clear
Actual:
69 | 51 0.00
Average:
70 | 57 0.13
Partly Cloudy
Actual:
73 | 63 0.00
Average:
70 | 57 0.13
Partly Cloudy
Actual:
79 | 69 0.00
Average:
69 | 57 0.12
Partly Cloudy
Actual:
80 | 69 0.00
Average:
69 | 56 0.12
Rain
Actual:
73 | 64 0.07
Average:
69 | 56 0.12
Partly Cloudy
Actual:
72 | 57 0.00
Average:
69 | 56 0.12
Scattered Clouds
Actual:
71 | 51 0.01
Average:
68 | 55 0.12
Rain
Actual:
66 | 53 0.07
Average:
68 | 55 0.12
Partly Cloudy
Actual:
57 | 45 0.01
Average:
68 | 55 0.12
Clear
Actual:
71 | 45 0.00
Average:
68 | 54 0.11
Clear
Actual:
75 | 54 0.01
Average:
67 | 54 0.11
Clear
Actual:
75 | 52 0.01
Average:
67 | 54 0.11
Fog
Actual:
73 | 59 0.01
Average:
67 | 54 0.11
Rain
Actual:
69 | 57 0.17
Average:
66 | 53 0.11
Clear
Actual:
61 | 48 0.00
Average:
66 | 53 0.10
Partly Cloudy
Actual:
62 | 46 0.00
Average:
66 | 53 0.10
Partly Cloudy
Actual:
64 | 46 0.00
Average:
65 | 52 0.10
Partly Cloudy
Actual:
62 | 50 0.00
Average:
65 | 52 0.10
Partly Cloudy
Actual:
62 | 52 0.00
Average:
64 | 51 0.10
Clear
Actual:
69 | 48 0.01
Average:
64 | 51 0.09
Partly Cloudy
Actual:
64 | 46 0.00
Average:
64 | 50 0.09
Partly Cloudy
Actual:
66 | 57 0.01
Average:
63 | 49 0.09
 

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
Sep high avg low high avg low high avg low high avg low high avg low high avg high sum  
1 77 72 68 72 69 66 100 91 84 29.93 29.90 29.86 10 7 1 13 8 22 0.31 Rain , Thunderstorm
2 80 73 66 72 68 64 97 90 74 29.91 29.84 29.76 10 7 0 7 5 - 0.01 Fog
3 80 72 64 72 68 63 100 92 77 29.83 29.78 29.72 10 4 0 13 5 21 0.72 Fog , Rain , Thunderstorm
4 78 70 62 64 61 56 93 77 48 29.95 29.89 29.81 10 10 6 9 5 20 0.00  
5 77 64 54 66 58 50 90 79 63 30.13 29.98 29.90 10 10 9 13 4 21 0.02 Rain
6 66 58 52 50 47 43 89 65 45 30.24 30.18 30.13 10 10 10 7 2 - 0.00  
7 73 64 55 57 52 46 77 63 45 30.12 30.02 29.90 10 10 10 14 6 26 0.00  
8 78 68 59 63 55 43 84 64 48 30.08 29.86 29.76 10 10 10 12 8 22 0.00  
9 69 58 51 52 45 38 71 57 40 30.25 30.20 30.10 10 10 10 12 3 17 0.00  
10 73 68 63 65 60 51 90 76 65 30.21 30.15 30.09 10 10 10 15 10 26 0.00  
11 79 74 69 70 68 64 94 87 74 30.13 30.08 30.03 10 6 3 14 9 23 0.00  
12 80 74 69 70 68 66 94 87 74 30.03 29.92 29.75 8 6 3 14 9 25 0.00  
13 73 68 64 70 67 60 94 89 78 29.74 29.65 29.60 10 8 2 10 6 21 0.07 Rain
14 72 64 57 59 56 52 90 76 57 30.06 29.89 29.73 10 10 10 8 5 - 0.00  
15 71 60 51 54 51 49 93 72 51 30.17 30.12 30.07 10 10 10 9 3 - 0.01  
16 66 60 53 59 54 51 94 80 65 30.19 30.09 30.04 10 9 4 10 4 22 0.07 Rain
17 57 51 45 49 41 36 90 65 47 30.39 30.32 30.20 10 10 10 13 7 23 0.01  
18 71 58 45 53 47 40 93 67 33 30.33 30.25 30.17 10 10 10 9 4 16 0.00  
19 75 64 54 58 54 50 90 73 48 30.17 30.12 30.07 10 10 10 8 4 - 0.01  
20 75 64 52 63 57 50 97 81 64 30.11 30.08 30.05 10 9 4 8 2 - 0.01  
21 73 66 59 63 59 57 96 86 66 30.07 29.99 29.82 10 7 0 12 4 22 0.01 Fog
22 69 64 57 66 62 48 100 88 67 29.80 29.71 29.68 10 8 2 12 7 22 0.17 Rain
23 61 54 48 46 43 40 83 65 47 29.99 29.90 29.81 10 10 10 13 7 24 0.00  
24 62 54 46 47 43 41 87 71 50 29.98 29.92 29.85 10 10 10 10 3 18 0.00  
25 64 54 46 49 47 44 93 74 53 29.98 29.92 29.89 10 10 10 8 3 - 0.00  
26 62 56 50 51 47 45 89 70 56 30.11 30.04 29.97 10 10 10 12 4 18 0.00  
27 62 58 52 53 51 50 93 76 65 30.26 30.18 30.10 10 10 10 13 6 21 0.00  
28 69 59 48 55 50 45 93 77 52 30.32 30.29 30.25 10 10 10 9 2 - 0.01  
29 64 55 46 56 52 45 93 80 63 30.26 30.18 30.11 10 10 10 10 4 - 0.00  
30 66 60 57 57 54 52 94 81 64 30.09 30.03 29.96 10 10 10 12 4 18 0.01