Weather History for Chatham, MA

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Month of September, 2012

  Max Avg Min Sum
Temperature  
Max Temperature 81 °F 71 °F 63 °F
Mean Temperature 73 °F 64 °F 56 °F
Min Temperature 68 °F 57 °F 46 °F
Degree Days  
Heating Degree Days (base 65) 9 3 0 82
Cooling Degree Days (base 65) 8 1 0 43
Growing Degree Days (base 50) 23 14 6 411
Dew Point  
Dew Point 73 °F 58 °F 38 °F
Precipitation  
Precipitation 1.28 in 0.15 in 0.00 in 4.45 in
Snowdepth - - - -
Wind  
Wind 16 mph 5 mph 0 mph
Gust Wind 32 mph 20 mph 16 mph
Sea Level Pressure  
Sea Level Pressure 30.40 in 30.04 in 29.72 in

Monthly Weather History Graph

Monthly Weather History Graph

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Date:

Astronomy

Sep. 27, 2012 Rise Set
Actual Time 6:33 AM EDT 6:27 PM EDT
Civil Twilight 6:05 AM EDT 6:55 PM EDT
Nautical Twilight 5:33 AM EDT 7:27 PM EDT
Astronomical Twilight 5:00 AM EDT 8:00 PM EDT
Moon 4:58 PM EDT (9/27) 3:57 AM EDT (9/27)
Length of Visible Light 12h 50m
Length of Day
11h 54m
Waxing Gibbous, 94% of the Moon is Illuminated
Sep 27
Waxing Gibbous
Sep 29
Full
Oct 8
Last Quarter
Oct 15
New
Oct 21
First Quarter

Weather History Calendar

Precipitation Actual month total 4.45 Average Month Total: 3.46
Sunday Monday Tuesday Wednesday Thursday Friday Saturday
 
Clear
Actual:
78 | 64 0.00
Average:
72 | 59 0.13
Partly Cloudy
Actual:
72 | 57 0.00
Average:
72 | 59 0.13
Scattered Clouds
Actual:
73 | 57 0.00
Average:
71 | 59 0.13
Mostly Cloudy
Actual:
73 | 61 0.00
Average:
71 | 58 0.13
Thunderstorm
Actual:
77 | 66 0.44
Average:
71 | 58 0.13
Scattered Clouds
Actual:
73 | 62 0.00
Average:
71 | 58 0.13
Partly Cloudy
Actual:
81 | 66 0.00
Average:
71 | 58 0.13
Partly Cloudy
Actual:
79 | 68 0.00
Average:
70 | 58 0.13
Rain
Actual:
73 | 55 0.24
Average:
70 | 57 0.13
Rain
Actual:
66 | 55 0.00
Average:
70 | 57 0.13
Clear
Actual:
68 | 54 0.00
Average:
69 | 57 0.12
Clear
Actual:
77 | 53 0.01
Average:
69 | 56 0.12
Clear
Actual:
75 | 60 0.00
Average:
69 | 56 0.12
Scattered Clouds
Actual:
75 | 63 0.00
Average:
69 | 56 0.12
Thunderstorm
Actual:
73 | 59 0.20
Average:
68 | 55 0.12
Scattered Clouds
Actual:
69 | 51 0.00
Average:
68 | 55 0.12
Clear
Actual:
73 | 48 0.00
Average:
68 | 55 0.12
Scattered Clouds
Actual:
73 | 61 0.00
Average:
68 | 54 0.11
Rain
Actual:
70 | 60 1.14
Average:
67 | 54 0.11
Clear
Actual:
64 | 54 0.00
Average:
67 | 54 0.11
Rain
Actual:
63 | 50 0.03
Average:
67 | 54 0.11
Partly Cloudy
Actual:
68 | 60 0.03
Average:
66 | 53 0.11
Partly Cloudy
Actual:
69 | 52 0.00
Average:
66 | 53 0.10
Scattered Clouds
Actual:
64 | 51 0.00
Average:
66 | 53 0.10
Clear
Actual:
71 | 46 0.00
Average:
65 | 52 0.10
Rain
Actual:
73 | 64 0.00
Average:
65 | 52 0.10
Partly Cloudy
Actual:
68 | 51 0.00
Average:
64 | 51 0.10
Thunderstorm
Actual:
64 | 48 0.39
Average:
64 | 51 0.09
Thunderstorm
Actual:
64 | 57 0.69
Average:
64 | 50 0.09
Rain
Actual:
63 | 55 1.28
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

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 78 71 64 69 60 55 85 68 57 30.13 30.01 29.85 10 10 9 14 7 21 0.00  
2 72 64 57 61 58 55 96 78 68 30.15 30.12 30.09 10 10 10 7 4 - 0.00  
3 73 64 57 61 57 53 100 79 55 30.24 30.20 30.15 10 10 10 10 3 - 0.00  
4 73 67 61 68 63 59 96 86 71 30.19 30.05 29.95 10 10 8 14 6 21 0.00  
5 77 72 66 73 70 64 100 94 83 29.94 29.82 29.78 10 5 0 14 8 25 0.44 Fog , Rain , Thunderstorm
6 73 67 62 64 62 60 93 82 68 29.92 29.90 29.84 10 10 10 8 5 - 0.00  
7 81 73 66 72 69 64 100 89 71 29.96 29.93 29.89 10 9 2 12 5 17 0.00  
8 79 72 68 72 69 66 100 91 76 29.95 29.84 29.72 10 8 1 16 8 26 0.00  
9 73 65 55 72 62 55 100 91 80 29.84 29.79 29.72 10 9 2 14 5 26 0.24 Rain
10 66 60 55 60 52 46 97 72 49 30.02 29.90 29.83 10 10 10 15 4 23 0.00 Rain
11 68 62 54 51 47 41 90 64 39 30.29 30.19 30.03 10 10 9 8 5 - 0.00  
12 77 63 53 59 54 51 93 70 45 30.39 30.35 30.30 10 10 10 9 4 17 0.01  
13 75 68 60 62 59 55 83 73 59 30.40 30.36 30.31 10 10 10 12 6 20 0.00  
14 75 69 63 65 62 60 96 83 64 30.31 30.24 30.13 10 10 10 9 6 17 0.00  
15 73 66 59 66 60 46 94 80 54 30.12 30.03 29.98 10 9 1 9 3 16 0.20 Rain , Thunderstorm
16 69 60 51 52 49 45 93 70 49 30.09 30.05 30.01 10 10 10 7 1 - 0.00  
17 73 60 48 55 52 47 97 71 43 30.12 30.09 30.06 10 10 10 9 4 - 0.00  
18 73 66 61 64 60 54 90 78 66 30.10 30.01 29.87 10 10 10 15 7 28 0.00  
19 70 65 60 68 61 48 100 84 51 30.17 29.91 29.80 10 6 1 16 8 32 1.14 Rain
20 64 59 54 53 49 47 86 68 54 30.23 30.19 30.17 10 10 10 13 8 21 0.00  
21 63 56 50 61 55 49 100 87 72 30.16 30.09 30.00 10 9 2 12 5 17 0.03 Rain
22 68 64 60 61 60 59 100 93 78 29.98 29.94 29.90 10 6 1 9 6 - 0.03  
23 69 60 52 66 57 46 96 79 47 30.09 29.95 29.85 10 10 7 10 6 21 0.00  
24 64 58 51 47 44 38 80 65 38 30.14 30.11 30.09 10 10 10 8 2 - 0.00  
25 71 58 46 54 48 41 86 65 45 30.23 30.20 30.16 10 10 10 14 5 26 0.00  
26 73 68 64 64 61 55 88 78 68 30.20 30.12 30.05 10 10 2 15 9 28 0.00 Rain
27 68 60 51 65 57 46 97 78 60 30.25 30.13 30.02 10 9 6 13 6 23 0.00  
28 64 56 48 63 54 45 100 82 62 30.26 30.11 29.95 10 9 2 15 6 29 0.39 Rain , Thunderstorm
29 64 60 57 65 61 55 100 96 90 29.95 29.90 29.87 10 6 0 9 2 17 0.69 Fog , Rain , Thunderstorm
30 63 58 55 58 56 53 100 93 75 29.90 29.79 29.74 10 7 1 14 3 21 1.28 Rain