Portsmouth Rhode Island Weather Almanac  
Saturday, September 7, 2024  
Partly Cloudy to Cloudy, Light Rain PM, Seasonal Temperatures  
  Climate Normal Period Climate Record Period
  1991 - 2020 1893 - 2024
    September 7, 2024   Record   Record  
Observed Daily Data   2024   2024   Norm   Depart   Highest   Lowest  
Maximum Temperature   76   90   75   +1   93   in 1983   63   in 1940  
Minimum Temperature   58   70   60   -2   71   in 1999   43   in 1962  
Average Temperature   67   80   67   +0   82   in 1983   57   in 2000  
 Month Avg Max Temperature   76.6   83.6   75.7   +0.9   85.6   in 1898   67.6   in 1994  
Month Avg Min Temperature   58.1   64.1   60.7   -2.6   70.4   in 1898   51.4   in 1893  
Month Average Temperature   67.6   74.0   68.1   -0.6   78.3   in 1898   61.0   in 1994  
High Heat Index   77   102   77   +0   102   in 2023            
Low Wind Chill                             42   in 1984  
Heating Degree Days   0   0   1   -1   8   in 2000   0   in 2024  
Month Heating DD   2   1   7   -5   32   in 1994   0   in 2021  
Season Heating DD   4   1   14   -10   48   in 1994   0   in 2021    
Cooling Degree Days   2   15   3   -1   17   in 1983   0   in 2019    
Month Cooling DD   20   64   27   -7   93   in 1898   0   in 1976    
Year Cooling DD   666   636   564   +102   812   in 2020   273   in 1902    
Maximum Dew Point   65   78   65   +0   78   in 2023   47   in 1984    
Minimum Dew Point   56   70   55   +1   70   in 2023   38   in 1984    
Average  Dew Point   61   74   60   +1   74   in 2023   43   in 1984  
 Month Avg Max Dew Point   64.3   72.0   65.3   -1.0   72.6   in 2014   53.3   in 1984  
Month Avg Min Dew Point   53.9   62.6   56.3   -2.4   64.9   in 1973   43.4   in 1984  
Month Average Dew Point   59.3   67.4   60.7   -1.4   68.6   in 1973   48.4   in 1984  
Precipitation   .10   .00   .12   -.02   1.36   in 1996            
One Hour Rain   .06   .00           .42   in 1974            
Half Hour Rain   .05   .00           .18   in 2008            
Hourly Rain Rate   .82   .00           1.99   in 2017            
Month Precipitation   .16   .00   .78   -.62   6.53   in 2021   .00   in 2015  
Year Precipitation   40.85   35.62   30.19   +10.66   45.84   in 1998   16.55   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 7, 2024     Record Record
Observed Daily Data   2024   2023   Norm   Depart   Highest Lowest
Maximum Humidity   95%   99%   92%   +3%   100%   in 2017   71%   in 1952  
Minimum Humidity   60%   64%   58%   +2%   94%   in 2011   30%   in 1980  
Average Humidity   78%   82%   75%   +2%   96%   in 2011   58%   in 1967  
Maximum Barometer   29.97   29.89   30.10   -00.13   30.45   in 1984   29.75   in 1951  
Minimum Barometer   29.78   29.74   29.90   -00.12   30.22   in 1984   29.39   in 2008  
Average Barometer   29.88   29.82   30.00   -00.13   30.34   in 1984   29.64   in 1979  
Average Wind   6.5   4.4   5.9   +0.6   13.3   in 2019   0.9   in 1989  
Direction   S   SSW   SSW       N         SSE        
High Wind Gust   22   17   21   +1   48   in 1958   10   in 1992  
Direction   NW   S   SSW       SW         SSE        
Maximum Water Temp   68.4   74.3   70.4   -2.0   74.3   in 2023   66.2   in 2017  
Minimum Water Temp   67.1   71.2   68.0   -0.9   71.7   in 2018   64.5   in 2017  
Average Water Temp   67.8   72.8   69.2   -1.5   72.9   in 2018   65.4   in 2017  
Sunrise/ AM Twilight   6:17:46 AM   5:49:55 AM            
Sunset / PM Twilight   7:07:10 PM   7:36:19 PM            
Length Of Day   12:49:24                          
Special Conditions   Fog                                  
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