Portsmouth Rhode Island Weather Almanac  
Monday, September 4, 2023  
Clear, Light Winds, Hot and Muggy  
  Climate Normal Period Climate Record Period
  1991 - 2020 1893 - 2023
    September 4, 2023   Record   Record  
Observed Daily Data   2023   2022   Norm   Depart   Highest   Lowest  
Maximum Temperature   88   81   76   +12   89   in 1937   63   in 1997  
Minimum Temperature   66   61   61   +5   73   in 1959   49   in 1976  
Average Temperature   77   71   68   +9   80   in 2018   58   in 1997  
 Month Avg Max Temperature   79.8   79.5   76.3   +3.5   89.0   in 1929   67.3   in 2003  
Month Avg Min Temperature   60.0   58.8   61.3   -1.3   72.5   in 1959   51.5   in 1967  
Month Average Temperature   70.0   69.3   68.5   +1.5   79.3   in 1898   60.8   in 2017  
High Heat Index   96   84   78   +18   99   in 1973            
Low Wind Chill                             48   in 1976  
Heating Degree Days   0   0   1   -1   7   in 1997   0   in 2023  
Month Heating DD   1   0   4   -3   18   in 2017   0   in 2022  
Season Heating DD   1   0   4   -3   42   in 1905   0   in 2022  
Cooling Degree Days   12   6   4   +8   15   in 2018   0   in 1997  
Month Cooling DD   21   17   18   +3   57   in 1898   0   in 1986  
Year Cooling DD   593   728   555   +38   795   in 2020   272   in 1902  
Maximum Dew Point   75   70   65   +10   75   in 2023   48   in 1997  
Minimum Dew Point   65   55   56   +9   68   in 1961   40   in 1989  
Average  Dew Point   70   63   61   +9   71   in 2018   45   in 1989  
 Month Avg Max Dew Point   67.3   63.0   65.5   +1.8   74.3   in 1959   54.3   in 1975  
Month Avg Min Dew Point   57.5   51.3   56.8   +0.8   70.5   in 1959   41.8   in 1967  
Month Average Dew Point   62.5   57.5   61.0   +1.5   72.4   in 1959   48.6   in 1967  
Precipitation   .00   .00   .11   -.11   2.02   in 1905            
One Hour Rain   .00   .00           .55   in 1970            
Half Hour Rain   .00   .00           .12   in 2012            
Hourly Rain Rate   .00   .00           3.25   in 2012            
Month Precipitation   .00   .00   .44   -.44   6.45   in 2021   .00   in 2023  
Year Precipitation   35.62   25.42   29.72   +5.90   45.30   in 1998   16.55   in 1957  
Snow                                      
Snow Depth                                      
Month Snow                                      
Season Snow   0.0   0.0   0.0   +0.0   0.0   in 1996   0.0   in 1998  
    September 4, 2023     Record Record
Observed Daily Data   2023   2022   Norm   Depart   Highest Lowest
Maximum Humidity   98%   98%   93%   +5%   100%   in 2003   72%   in 1983  
Minimum Humidity   63%   66%   58%   +5%   93%   in 2003   34%   in 2007  
Average Humidity   81%   82%   75%   +5%   97%   in 2003   59%   in 1983  
Maximum Barometer   29.88   30.19   30.09   -00.21   30.63   in 1989   29.70   in 1957  
Minimum Barometer   29.82   30.07   29.89   -00.07   30.24   in 1965   29.30   in 2010  
Average Barometer   29.85   30.13   29.99   -00.14   30.42   in 1989   29.53   in 2010  
Average Wind   2.8   4.1   5.7   -2.9   12.1   in 1972   1.3   in 1969  
Direction   S   SSW   S       WNW ESE
High Wind Gust   13   17   21   -8   37   in 1988   11   in 1969  
Direction   SSW   SSW   SSW       SSE S
Maximum Water Temp   73.8   72.3   70.6   +3.2   73.8   in 2022   65.7   in 2017  
Minimum Water Temp   71.8   69.4   68.1   +3.7   71.8   in 2022   63.4   in 2017  
Average Water Temp   72.8   70.9   69.4   +3.4   72.8   in 2022   64.6   in 2017  
Sunrise/ AM Twilight   6:13:58 AM   5:46:44 AM            
Sunset / PM Twilight   7:13:31 PM   7:41:32 PM            
Length Of Day   12:59:33                          
Special Conditions   Fog                                  
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