Weather History for Chatham, MA

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Wednesday, September 21, 2011

  Actual Average Record
Temperature  
Mean Temperature 69 °F -  
Max Temperature 77 °F 67 °F 79 °F (1974)
Min Temperature 61 °F 54 °F 46 °F (1997)
Cooling Degree Days 4    
Growing Degree Days 19 (Base 50)    
Moisture  
Dew Point 62 °F    
Average Humidity 79    
Maximum Humidity 94    
Minimum Humidity 64    
Precipitation  
Precipitation 0.00 in - - ()
Sea Level Pressure  
Sea Level Pressure 30.25 in    
Wind  
Wind Speed 3 mph (South)    
Max Wind Speed 8 mph    
Max Gust Speed -    
Visibility 9 miles    
Events Rain    
Averages and records for this station are not official NWS values.
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Date:

Astronomy

Sep. 21, 2011 Rise Set
Actual Time 6:26 AM EDT 6:39 PM EDT
Civil Twilight 5:58 AM EDT 7:07 PM EDT
Nautical Twilight 5:25 AM EDT 7:39 PM EDT
Astronomical Twilight 4:52 AM EDT 8:12 PM EDT
Moon No Moon Rise 2:51 PM EDT (9/21)
Length of Visible Light 13h 08m
Length of Day
12h 13m
Last Quarter, 39% of the Moon is Illuminated
Sep 21
Last Quarter
Sep 27
New
Oct 3
First Quarter
Oct 11
Full
Oct 19
Last Quarter

Hourly Weather History & Observations

Time (EDT) Temp. Dew Point Humidity Pressure Visibility Wind Dir Wind Speed Gust Speed Precip Events Conditions
12:17 AM 64.4 °F 62.6 °F 94% 30.17 in 10.0 mi Calm Calm - N/A   Mostly Cloudy
12:52 AM 63.0 °F 60.1 °F 90% 30.18 in 9.0 mi Calm Calm - N/A   Clear
1:52 AM 62.1 °F 59.0 °F 90% 30.19 in 6.0 mi Calm Calm - N/A   Clear
3:52 AM 62.1 °F 59.0 °F 90% 30.20 in 7.0 mi Calm Calm - N/A   Mostly Cloudy
4:52 AM 61.0 °F 59.0 °F 93% 30.22 in 6.0 mi Calm Calm - N/A   Mostly Cloudy
5:52 AM 63.0 °F 61.0 °F 93% 30.23 in 6.0 mi Calm Calm - N/A   Overcast
6:52 AM 64.0 °F 61.0 °F 90% 30.25 in 4.0 mi Calm Calm - N/A   Overcast
7:52 AM 66.0 °F 63.0 °F 90% 30.25 in 5.0 mi Calm Calm - N/A   Overcast
8:52 AM 70.0 °F 63.0 °F 78% 30.27 in 10.0 mi Variable 3.5 mph - N/A   Partly Cloudy
10:18 AM 73.4 °F 62.6 °F 69% 30.28 in 10.0 mi SSW 4.6 mph - N/A   Overcast
10:52 AM 73.9 °F 63.0 °F 68% 30.27 in 10.0 mi SSW 4.6 mph - N/A   Mostly Cloudy
11:03 AM 75.2 °F 62.6 °F 65% 30.27 in 10.0 mi SW 4.6 mph - N/A   Mostly Cloudy
11:16 AM 75.2 °F 62.6 °F 65% 30.27 in 10.0 mi SSW 5.8 mph - N/A   Mostly Cloudy
11:52 AM 73.9 °F 63.0 °F 68% 30.28 in 10.0 mi SW 6.9 mph - N/A   Mostly Cloudy
12:29 PM 77.0 °F 64.4 °F 65% 30.27 in 10.0 mi Variable 6.9 mph - N/A   Mostly Cloudy
12:52 PM 77.0 °F 64.0 °F 64% 30.27 in 10.0 mi South 6.9 mph - N/A   Scattered Clouds
1:52 PM 73.9 °F 61.0 °F 64% 30.26 in 10.0 mi South 5.8 mph - N/A   Clear
2:52 PM 73.9 °F 61.0 °F 64% 30.26 in 10.0 mi South 5.8 mph - N/A   Clear
3:52 PM 72.0 °F 61.0 °F 68% 30.26 in 10.0 mi South 8.1 mph - N/A   Clear
4:52 PM 71.1 °F 60.1 °F 68% 30.25 in 10.0 mi South 6.9 mph - N/A   Clear
5:52 PM 68.0 °F 61.0 °F 78% 30.25 in 10.0 mi Variable 3.5 mph - N/A   Clear
6:52 PM 66.0 °F 61.0 °F 84% 30.26 in 10.0 mi South 5.8 mph - N/A   Clear
7:52 PM 64.9 °F 61.0 °F 87% 30.27 in 10.0 mi South 4.6 mph - N/A   Clear
9:52 PM 66.0 °F 62.1 °F 87% 30.27 in 10.0 mi Variable 4.6 mph - N/A   Mostly Cloudy
10:52 PM 66.0 °F 62.1 °F 87% 30.26 in 10.0 mi South 5.8 mph - 0.00 in Rain Light Rain
11:38 PM 66.2 °F 60.8 °F 83% 30.25 in 10.0 mi SSE 5.8 mph - N/A   Overcast
11:50 PM 66.2 °F 60.8 °F 83% 30.25 in 10.0 mi SSE 6.9 mph - N/A   Overcast
11:52 PM 66.0 °F 61.0 °F 84% 30.25 in 10.0 mi SSE 3.5 mph - N/A   Overcast