Portsmouth Rhode Island Weather Almanac  
Wednesday, September 20, 2023  
Continued Clear and Pleasant  
  Climate Normal Period Climate Record Period
  1991 - 2020 1893 - 2023
    September 20, 2023   Record   Record  
Observed Daily Data   2023   2022   Norm   Depart   Highest   Lowest  
Maximum Temperature   74   73   71   +3   85   in 1983   59   in 1993  
Minimum Temperature   55   59   56   -1   69   in 1938   38   in 1979  
Average Temperature   65   66   63   +2   76   in 1983   50   in 1979  
 Month Avg Max Temperature   78.8   75.1   73.7   +5.1   81.3   in 1983   68.4   in 1913  
Month Avg Min Temperature   63.8   60.0   58.8   +5.0   64.0   in 1915   52.9   in 1984  
Month Average Temperature   71.6   67.7   66.2   +5.3   72.0   in 1961   61.8   in 1913  
High Heat Index   73   74   71   +2   88   in 1983            
Low Wind Chill                             36   in 1979  
Heating Degree Days   0   0   3   -3   15   in 1979   0   in 2023  
Month Heating DD   5   12   32   -27   95   in 1913   0   in 2015  
Season Heating DD   5   12   32   -27   110   in 1956   0   in 2015  
Cooling Degree Days   0   1   1   -1   11   in 1983   0   in 2023  
Month Cooling DD   136   66   56   +80   155   in 1961   7   in 1893  
Year Cooling DD   708   777   593   +115   840   in 2020   282   in 1902  
Maximum Dew Point   61   65   62   -1   74   in 1989   38   in 1993  
Minimum Dew Point   52   57   52   +0   66   in 2016   26   in 1993  
Average  Dew Point   57   61   57   +0   69   in 2016   32   in 1993  
 Month Avg Max Dew Point   69.8   65.1   63.9   +5.9   69.8   in 2023   54.9   in 1984  
Month Avg Min Dew Point   61.6   56.0   54.4   +7.2   61.6   in 2023   44.5   in 1984  
Month Average Dew Point   65.9   60.9   59.1   +6.8   65.9   in 2023   49.7   in 1984  
Precipitation   .00   .01   .13   -.13   7.81   in 1960            
One Hour Rain   .00   .01           1.65   in 1960            
Half Hour Rain   .00   .00           .21   in 2006            
Hourly Rain Rate   .00   .00           1.48   in 2006            
Month Precipitation   3.85   3.26   2.45   +1.40   9.57   in 1960   .06   in 1946  
Year Precipitation   39.47   28.68   31.73   +7.74   46.35   in 1998   17.53   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 20, 2023     Record Record
Observed Daily Data   2023   2022   Norm   Depart   Highest Lowest
Maximum Humidity   90%   99%   94%   -4%   100%   in 2017   66%   in 1993  
Minimum Humidity   50%   76%   61%   -11%   91%   in 1988   32%   in 2020  
Average Humidity   70%   88%   77%   -7%   96%   in 1988   50%   in 1993  
Maximum Barometer   30.16   29.92   30.14   +00.02   30.55   in 2020   29.61   in 1954  
Minimum Barometer   30.01   29.81   29.94   +00.07   30.38   in 2020   29.39   in 1955  
Average Barometer   30.09   29.87   30.04   +00.05   30.47   in 2020   29.56   in 1955  
Average Wind   5.8   3.3   6.4   -0.6   18.7   in 2017   2.0   in 2016  
Direction   WNW   ENE   SSW       NNE SSW
High Wind Gust   15   15   21   -6   41   in 1984   9   in 2016  
Direction   WNW   N   SSW       SW NNW
Maximum Water Temp   70.9   70.9   68.1   +2.8   71.5   in 2003   65.5   in 2020  
Minimum Water Temp   69.8   69.3   66.0   +3.8   69.8   in 2022   63.1   in 2004  
Average Water Temp   70.4   70.1   67.1   +3.3   70.4   in 2022   64.4   in 2004  
Sunrise/ AM Twilight   6:30:12 AM   6:03:31 AM            
Sunset / PM Twilight   6:46:05 PM   7:13:31 PM            
Length Of Day   12:15:53                          
Special Conditions   None                                  
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