Portsmouth Rhode Island Weather Almanac  
Thursday, September 28, 2023  
Clear early then Partly Cloudy and Warmer  
  Climate Normal Period Climate Record Period
  1991 - 2020 1893 - 2023
    September 28, 2023   Record   Record  
Observed Daily Data   2023   2022   Norm   Depart   Highest   Lowest  
Maximum Temperature   69   70   68   +1   80   in 2017   55   in 1914  
Minimum Temperature   50   51   54   -4   67   in 2010   35   in 1980  
Average Temperature   60   61   61   -1   71   in 1961   46   in 1965  
 Month Avg Max Temperature   74.9   73.3   72.4   +2.5   78.6   in 1961   67.8   in 1963  
Month Avg Min Temperature   60.7   58.0   57.7   +3.0   63.3   in 1961   52.0   in 1956  
Month Average Temperature   68.2   65.9   65.1   +3.1   71.1   in 1961   60.4   in 1963  
High Heat Index   69   68   70   -1   81   in 2017            
Low Wind Chill   48                         33   in 1980  
Heating Degree Days   5   4   5   +0   19   in 1965   0   in 2021  
Month Heating DD   46   42   63   -17   167   in 1956   3   in 2021  
Season Heating DD   46   42   63   -17   198   in 1956   3   in 2021  
Cooling Degree Days   0   0   1   -1   6   in 1961   0   in 2023  
Month Cooling DD   136   66   64   +72   186   in 1961   7   in 1893  
Year Cooling DD   708   777   601   +107   860   in 2020   287   in 1902  
Maximum Dew Point   59   55   60   -1   72   in 2017   31   in 1957  
Minimum Dew Point   49   49   49   +0   66   in 2010   22   in 1957  
Average  Dew Point   54   52   55   -1   68   in 2010   27   in 1957  
 Month Avg Max Dew Point   66.8   63.6   63.0   +3.8   67.4   in 2018   54.8   in 1966  
Month Avg Min Dew Point   58.5   53.8   53.2   +5.4   58.5   in 2023   44.3   in 1984  
Month Average Dew Point   62.9   59.0   58.1   +4.8   63.1   in 2018   49.8   in 1984  
Precipitation   .00   .00   .14   -.14   1.85   in 1958            
One Hour Rain   .00   .00           .73   in 2018            
Half Hour Rain   .00   .00           .39   in 2018            
Hourly Rain Rate   .00   .00           3.81   in 2021            
Month Precipitation   5.31   4.39   3.52   +1.79   10.67   in 1961   .31   in 1959  
Year Precipitation   40.93   29.81   32.80   +8.13   48.49   in 1998   17.64   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 28, 2023     Record Record
Observed Daily Data   2023   2022   Norm   Depart   Highest Lowest
Maximum Humidity   98%   92%   93%   +5%   100%   in 2017   59%   in 1957  
Minimum Humidity   65%   55%   59%   +6%   96%   in 2004   24%   in 1957  
Average Humidity   82%   74%   76%   +5%   98%   in 2004   42%   in 1957  
Maximum Barometer   30.32   30.19   30.12   +00.20   30.46   in 1985   29.62   in 2009  
Minimum Barometer   30.26   29.93   29.89   +00.37   30.28   in 1950   29.45   in 2009  
Average Barometer   30.29   30.06   30.00   +00.29   30.35   in 1950   29.54   in 2009  
Average Wind   6.4   3.8   6.4   -0.0   14.3   in 1956   0.9   in 1965  
Direction   ENE   NW   S       NNE NNW
High Wind Gust   17   17   22   -5   44   in 1985   10   in 2015  
Direction   E   NW   S       SW SE
Maximum Water Temp   66.6   70.2   66.9   -0.3   70.2   in 2021   62.9   in 2010  
Minimum Water Temp   65.5   69.4   65.1   +0.4   69.4   in 2021   61.1   in 2010  
Average Water Temp   66.1   69.8   66.0   +0.1   69.8   in 2021   62.0   in 2010  
Sunrise/ AM Twilight   6:38:28 AM   6:11:50 AM            
Sunset / PM Twilight   6:32:17 PM   6:59:40 PM            
Length Of Day   11:53:49                          
Special Conditions   None                                  
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