Portsmouth Rhode Island Weather Almanac  
Thursday, September 19, 2024  
Mostly Cloudy early then Cloudy, Light Rain & Fog, Windy and Warmer  
  Climate Normal Period Climate Record Period
  1991 - 2020 1893 - 2024
    September 19, 2024   Record   Record  
Observed Daily Data   2024   2023   Norm   Depart   Highest   Lowest  
Maximum Temperature   71   73   71   +0   85   in 1946   60   in 1987  
Minimum Temperature   64   59   56   +8   68   in 2016   37   in 1956  
Average Temperature   68   66   64   +4   75   in 1906   50   in 1956  
 Month Avg Max Temperature   75.7   79.1   73.8   +1.9   81.1   in 1983   68.7   in 1913  
Month Avg Min Temperature   57.5   64.3   58.9   -1.4   64.3   in 2023   52.8   in 1984  
Month Average Temperature   66.8   71.9   66.4   +0.4   72.3   in 1961   61.7   in 1963  
High Heat Index   73   73   71   +2   86   in 1983            
Low Wind Chill                             32   in 1956  
Heating Degree Days   0   0   3   -3   15   in 1956   0   in 2024  
Month Heating DD   8   5   29   -21   90   in 1913   0   in 2015  
Season Heating DD   10   5   36   -26   102   in 1956   0   in 2015    
Cooling Degree Days   3   1   2   +1   10   in 1906   0   in 2021    
Month Cooling DD   42   136   55   -13   153   in 1961   7   in 1975    
Year Cooling DD   688   708   592   +96   840   in 2020   280   in 1902    
Maximum Dew Point   67   62   62   +5   72   in 1991   40   in 2020    
Minimum Dew Point   62   55   52   +10   66   in 2016   26   in 1979    
Average  Dew Point   65   59   57   +8   69   in 2016   35   in 2020  
 Month Avg Max Dew Point   64.1   70.2   63.9   +0.2   70.2   in 2023   55.0   in 1984  
Month Avg Min Dew Point   53.7   62.1   54.5   -0.8   62.1   in 2023   44.2   in 1984  
Month Average Dew Point   59.2   66.3   59.2   +0.0   66.3   in 2023   49.6   in 1984  
Precipitation   .03   .00   .13   -.10   1.84   in 1972            
One Hour Rain   .02   .00           .71   in 2006            
Half Hour Rain   .01   .00           .44   in 2006            
Hourly Rain Rate   .00   .00           3.79   in 2016            
Month Precipitation   .19   3.85   2.32   -2.13   8.56   in 2021   .06   in 1946  
Year Precipitation   40.88   39.47   31.73   +9.15   46.35   in 1998   17.53   in 1957  
Snow   0.0   0.0   0.0   +0.0   0.0   in 1900            
Snow Depth   0   0   0   +0   0   in              
Month Snow   #N/A   #N/A   #N/A   #N/A   #N/A   in #N/A   #N/A   in Many  
Season Snow                                      
    September 19, 2024     Record Record
Observed Daily Data   2024   2023   Norm   Depart   Highest Lowest
Maximum Humidity   98%   98%   93%   +5%   100%   in 2018   70%   in 2020  
Minimum Humidity   87%   61%   60%   +27%   96%   in 1989   29%   in 2020  
Average Humidity   93%   80%   77%   +16%   98%   in 1989   50%   in 2020  
Maximum Barometer   29.97   30.01   30.15   -00.18   30.58   in 1939   29.81   in 1976  
Minimum Barometer   29.83   29.63   29.93   -00.10   30.36   in 2008   29.30   in 1981  
Average Barometer   29.90   29.82   30.04   -00.14   30.43   in 2008   29.60   in 1981  
Average Wind   13.2   9.0   6.1   +7.1   14.7   in 1987   2.2   in 2005  
Direction   NNE   WNW   NNE       NNE         SSW        
High Wind Gust   32   27   21   +11   43   in 1936   12   in 1999  
Direction   NNE   WNW   NNE       E         SE        
Maximum Water Temp   67.8   68.4   68.1   -0.3   71.1   in 2015   64.6   in 1996  
Minimum Water Temp   66.9   66.9   66.1   +0.8   70.2   in 2022   62.6   in 1996  
Average Water Temp   67.4   67.7   67.1   +0.2   70.6   in 2022   63.6   in 1996  
Sunrise/ AM Twilight   6:29:58 AM   6:02:28 AM            
Sunset / PM Twilight   6:46:30 PM   7:15:16 PM            
Length Of Day   12:16:32                          
Special Conditions   Fog                                  
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