Portsmouth Rhode Island Weather Almanac  
Tuesday, September 10, 2024  
Partly Cloudy early then Clear and Warmer  
  Climate Normal Period Climate Record Period
  1991 - 2020 1893 - 2024
    September 10, 2024   Record   Record  
Observed Daily Data   2024   2023   Norm   Depart   Highest   Lowest  
Maximum Temperature   77   80   74   +3   89   in 1961   60   in 1913  
Minimum Temperature   59   69   59   +0   71   in 2020   44   in 1956  
Average Temperature   68   75   66   +2   79   in 1897   54   in 1913  
 Month Avg Max Temperature   75.5   83.1   75.2   +0.3   84.7   in 1983   68.8   in 1994  
Month Avg Min Temperature   57.6   66.3   60.2   -2.6   67.7   in 1959   51.5   in 1893  
Month Average Temperature   66.7   74.9   67.7   -1.0   75.5   in 1959   62.1   in 1994  
High Heat Index   77   86   76   +1   95   in 1961            
Low Wind Chill                             40   in 1956  
Heating Degree Days   0   0   1   -1   11   in 1913   0   in 2024  
Month Heating DD   6   1   10   -4   36   in 1994   0   in 2021  
Season Heating DD   8   1   17   -9   63   in 1914   0   in 2021    
Cooling Degree Days   3   10   3   +0   14   in 1897   0   in 2018    
Month Cooling DD   23   100   36   -13   105   in 1959   0   in 1893    
Year Cooling DD   669   672   573   +96   835   in 2020   279   in 1902    
Maximum Dew Point   63   76   64   -1   76   in 2023   46   in 1975    
Minimum Dew Point   52   68   54   -2   69   in 2020   35   in 1980    
Average  Dew Point   58   72   59   -1   72   in 2023   42   in 1956  
 Month Avg Max Dew Point   62.9   73.7   64.9   -2.0   73.7   in 2023   54.2   in 1984  
Month Avg Min Dew Point   52.4   65.0   55.8   -3.4   65.0   in 2023   44.0   in 1984  
Month Average Dew Point   57.9   69.5   60.3   -2.4   69.5   in 2023   49.1   in 1984  
Precipitation   .00   .02   .12   -.12   2.58   in 1896            
One Hour Rain   .00   .02           .49   in 1999            
Half Hour Rain   .00   .01           .28   in 2015            
Hourly Rain Rate   .00   .00           2.09   in 2015            
Month Precipitation   .16   .02   1.14   -.98   7.60   in 2021   .00   in 2009  
Year Precipitation   40.85   35.64   30.55   +10.30   46.33   in 1998   16.94   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 10, 2024     Record Record
Observed Daily Data   2024   2023   Norm   Depart   Highest Lowest
Maximum Humidity   90%   99%   93%   -3%   100%   in 2016   63%   in 2024  
Minimum Humidity   54%   87%   58%   -4%   93%   in 1999   25%   in 1980  
Average Humidity   72%   93%   75%   -3%   97%   in 1999   54%   in 1953  
Maximum Barometer   30.12   30.14   30.12   -00.00   30.49   in 1957   29.81   in 1958  
Minimum Barometer   30.00   30.06   29.90   +00.10   30.31   in 2009   29.43   in 1933  
Average Barometer   30.06   30.10   30.01   +00.05   30.38   in 2009   29.71   in 1958  
Average Wind   4.5   3.7   6.0   -1.5   11.2   in 1965   1.8   in 1990  
Direction   WNW   SSE   S       SSW         SW        
High Wind Gust   16   14   20   -4   33   in 1965   12   in 2007  
Direction   S   S   S       SSW         NNE        
Maximum Water Temp   69.3   74.5   69.7   -0.4   74.5   in 2023   65.8   in 2017  
Minimum Water Temp   67.3   71.6   67.5   -0.2   71.6   in 2023   63.9   in 2017  
Average Water Temp   68.3   73.1   68.6   -0.3   73.1   in 2023   64.9   in 2017  
Sunrise/ AM Twilight   6:20:49 AM   5:53:04 AM            
Sunset / PM Twilight   7:02:03 PM   7:31:04 PM            
Length Of Day   12:41:14                          
Special Conditions   None                                  
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