Portsmouth Rhode Island Weather Almanac  
Saturday, August 14, 2021  
Partly Cloudy, Late Morning Shower & Fog, Light Winds, Continued Hot and Very Muggy  
Climate Normal Period Climate Record Period  
1991- 2020   1893 - 2021  
    August 14, 2021   Record   Record  
Observed Daily Data   2021   2020   Norm   Depart   Highest   Lowest  
Maximum Temperature   89   90   79   +10   92   in 1918   65   in 1946  
Minimum Temperature   73   67   64   +9   75   in 1988   48   in 1964  
Average Temperature   81   79   72   +9   82   in 1918   60   in 1964  
 Month Avg Max Temperature   81.0   85.4   79.4   +1.6   85.4   in 2020   71.8   in 1903  
Month Avg Min Temperature   65.8   69.4   64.6   +1.1   72.2   in 1988   55.8   in 1964  
Month Average Temperature   73.6   77.6   72.0   +1.6   78.8   in 1988   64.4   in 1964  
HDD   0   0   0   +0   5   in 1964   0   in    
Month HDD   0   0   0   +0   19   in 1964   0   in 2021  
Season HDD   9   0   3   +6   34   in 1914   0   in 2020  
CDD   16   14   7   +9   17   in 1918   0   in 1992  
Month CDD   121   176   105   +16   193   in 1988   11   in 1964  
Year CDD   511   640   433   +78   640   in 2020   203   in 1902  
Maximum Dew Point   79   71   68   +11   79   in 2021   47   in 1964  
Minimum Dew Point   65   60   60   +5   73   in 2005   38   in 1964  
Average  Dew Point   72   66   64   +8   75   in 2005   43   in 1964  
 Month Avg Max Dew Point   71.6   73.4   68.9   +2.7   74.3   in 2018   58.2   in 1964  
Month Avg Min Dew Point   63.1   64.9   60.9   +2.1   69.1   in 2003   47.2   in 1964  
Month Average Dew Point   67.3   69.1   64.8   +2.5   71.2   in 2003   52.7   in 1964  
Precipitation   .05   .00   .12   -.07   2.34   in 1942            
One Hour   .05   .00           .84   in 1963            
Hourly Rate   1.13   .00           3.56   in 2008            
Month Precipitation   4.02   .55   1.67   +2.35   7.15   in 1946   .01   in 1973  
Year Precipitation   26.85   22.93   27.32   -.47   43.87   in 1983   15.63   in 1957  
Snow   #N/A   #N/A   #N/A   #N/A   #N/A   in #N/A            
Snow Depth   #N/A   #N/A           #N/A   in              
Month Snow   #N/A   #N/A   #N/A   #N/A   #N/A   in #N/A   #N/A   in    
Season Snow   #N/A   #N/A   #N/A   #N/A   #N/A   in #N/A   #N/A   in #N/A  
    August 14, 2021     Record Record
Observed Daily Data   2021   2020   Norm   Depart   Highest Lowest
Maximum Humidity   96%   96%   93%   +3%   100%   in 2018   73%   in 1964  
Minimum Humidity   66%   40%   58%   +8%   92%   in 1984   37%   in 1964  
Average Humidity   81%   68%   76%   +5%   96%   in 1984   55%   in 1964  
Maximum Barometer   30.10   30.07   30.05   +00.05   30.39   in 1931   29.74   in 1963  
Minimum Barometer   29.98   29.97   29.87   +00.11   30.17   in 2003   29.25   in 1963  
Average Barometer   30.04   30.02   29.96   +00.08   30.22   in 2003   29.50   in 1963  
Average Wind   4.2   4.3   5.7   -1.5   12.6   in 2000   2.3   in 2017  
Direction   WNW   NE   SSW       NNE         SSE        
High Wind Gust   18   19   21   -3   37   in 1963   10   in 2017  
Direction   SW   NE   SSW       WNW         SSE        
High Heat Index   100   93   82   +18   101   in 2016            
Low Wind Chill                             #N/A   in #N/A  
Maximum Water Temp   74.8   70.7   72.0   +2.8   76.7   in 2016   68.2   in 2000  
Minimum Water Temp   72.3   67.3   67.7   +4.6   74.5   in 2012   42.3   in 2021  
Average Water Temp   73.6   69.0   70.4   +3.1   75.6   in 2012   67.1   in 1996  
Sunrise/ AM Twilight   5:54:16 AM   5:24:34 AM            
Sunset / PM Twilight   7:45:11 PM   8:14:53 PM            
Length Of Day   13:50:55                          
Special Conditions   Fog                                  
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