Portsmouth Rhode Island Weather Almanac  
Wednesday, September 8, 2021  
Partly Cloudy early, Clear Day to Mostly Cloudy PM, Breezy, Warmer & Humid  
  Climate Normal Period Climate Record Period
  1991 - 2020 1893 - 2021
    September 8, 2021   Record   Record  
Observed Daily Data   2021   2020   Norm   Depart   Highest   Lowest  
Maximum Temperature   80   81   74   +6   88   in 1945   62   in 1932  
Minimum Temperature   65   63   59   +6   70   in 2015   46   in 1952  
Average Temperature   73   72   67   +6   79   in 2015   56   in 1952  
 Month Avg Max Temperature   76.1   79.5   75.5   +0.6   85.0   in 1983   68.3   in 1994  
Month Avg Min Temperature   61.0   63.4   60.5   +0.5   69.3   in 1898   51.4   in 1893  
Month Average Temperature   68.9   71.6   68.0   +0.9   76.8   in 1898   61.4   in 1994  
High Heat Index   83   84   75   +8   93   in 2015            
Low Wind Chill                             #N/A   in #N/A  
HDD   0   0   1   -1   9   in 1952   0   in    
Month HDD   0   0   8   -8   33   in 1994   0   in 2021  
Season HDD   9   0   15   -6   49   in 1994   0   in 2020  
CDD   8   7   3   +5   14   in 2015   0   in 2018  
Month CDD   31   53   30   +1   94   in 1898   0   in 1893  
Year CDD   714   819   567   +147   819   in 2020   276   in 1902  
Maximum Dew Point   71   70   64   +7   74   in 2012   48   in 1980  
Minimum Dew Point   63   62   55   +8   69   in 2004   37   in 1955  
Average  Dew Point   67   66   60   +7   71   in 2004   44   in 1980  
 Month Avg Max Dew Point   65.9   67.6   65.1   +0.8   71.3   in 2014   52.9   in 1984  
Month Avg Min Dew Point   56.9   57.6   56.1   +0.8   64.3   in 1959   43.6   in 1984  
Month Average Dew Point   61.6   62.8   60.6   +1.0   67.4   in 1959   48.3   in 1984  
Precipitation   .00   .00   .12   -.12   1.84   in 2011            
One Hour   .00   .00           .69   in 2011            
Hourly Rate   .00   .00           5.94   in 2011            
Month Precipitation   6.53   .39   .90   +5.63   6.53   in 2021   .00   in 2015  
Year Precipitation   35.63   24.42   30.18   +5.45   46.33   in 1998   16.94   in 1957  
Snow   #N/A   #N/A   #N/A   #N/A   #N/A   in #N/A            
Snow Depth   #N/A   #N/A           #N/A   in              
Month Snow   #N/A   #N/A   #N/A   #N/A   #N/A   in #N/A   #N/A   in    
Season Snow   #N/A   #N/A   #N/A   #N/A   #N/A   in #N/A   #N/A   in #N/A  
    September 8, 2021     Record Record
Observed Daily Data   2021   2020   Norm   Depart   Highest Lowest
Maximum Humidity   97%   98%   92%   +5%   100%   in 2006   60%   in 1983  
Minimum Humidity   72%   65%   59%   +13%   96%   in 1993   30%   in 1980  
Average Humidity   85%   82%   75%   +9%   98%   in 1993   48%   in 1983  
Maximum Barometer   29.96   30.24   30.12   -00.16   30.54   in 1984   29.59   in 1998  
Minimum Barometer   29.86   30.10   29.93   -00.07   30.27   in 1984   29.47   in 1998  
Average Barometer   29.91   30.17   30.03   -00.12   30.41   in 1984   29.53   in 1998  
Average Wind   8.2   3.4   5.5   +2.7   10.2   in 1981   1.0   in 1989  
Direction   S   S   S       S         SW        
High Wind Gust   26   15   20   +6   47   in 1932   11   in 2009  
Direction   SW   S   SW       N         WNW        
Maximum Water Temp   71.8   72.1   70.2   +1.6   74.3   in 2015   66.2   in 2017  
Minimum Water Temp   69.4   69.4   67.9   +1.5   72.2   in 2012   64.3   in 2017  
Average Water Temp   70.6   70.8   69.1   +1.5   73.1   in 2012   65.3   in 2017  
Sunrise/ AM Twilight   6:17:36 AM   5:50:58 AM            
Sunset / PM Twilight   7:07:57 PM   7:34:34 PM            
Length Of Day   12:50:21                          
Special Conditions   None                              
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