Portsmouth Rhode Island Weather Almanac  
Tuesday, August 10, 2021  
Cloudy early, Partly Cloudy Day to Cloudy PM, Seasonal Temps  
Climate Normal Period Climate Record Period  
1991- 2020   1893 - 2021  
    August 10, 2021   Record   Record  
Observed Daily Data   2021   2020   Norm   Depart   Highest   Lowest  
Maximum Temperature   79   88   79   +0   92   in 1949   63   in 1962  
Minimum Temperature   67   71   64   +3   75   in 1988   49   in 1964  
Average Temperature   73   80   72   +1   83   in 1896   60   in 2007  
 Month Avg Max Temperature   78.2   84.9   79.5   -1.3   86.0   in 1980   71.0   in 1903  
Month Avg Min Temperature   63.3   68.8   64.9   -1.6   71.6   in 1988   55.2   in 1964  
Month Average Temperature   71.0   77.0   72.0   -1.0   78.3   in 1988   64.2   in 1964  
HDD   0   0   0   +0   5   in 2007   0   in    
Month HDD   0   0   0   +0   18   in 1903   0   in 2021  
Season HDD   9   0   3   +6   34   in 1914   0   in 2020  
CDD   8   15   7   +1   18   in 1896   0   in 2007  
Month CDD   60   120   77   -17   133   in 1988   6   in 1964  
Year CDD   450   584   405   +45   584   in 2020   193   in 1902  
Maximum Dew Point   72   75   69   +3   75   in 2020   54   in 1964  
Minimum Dew Point   65   69   61   +4   72   in 2012   39   in 1964  
Average  Dew Point   69   72   65   +4   74   in 2012   47   in 1964  
 Month Avg Max Dew Point   69.3   72.8   69.0   +0.3   74.5   in 2018   57.4   in 1964  
Month Avg Min Dew Point   60.7   64.2   61.3   -0.6   69.3   in 2003   46.7   in 1964  
Month Average Dew Point   65.0   68.5   65.0   +0.0   71.4   in 2003   52.1   in 1964  
Precipitation   .00   .00   .12   -.12   2.97   in 1991            
One Hour   .00   .00           1.34   in 1954            
Hourly Rate   .00   .00           9.76   in 2012            
Month Precipitation   3.97   .12   1.19   +2.78   6.70   in 1952   .00   in 1998  
Year Precipitation   26.80   22.50   26.84   -.04   41.55   in 1998   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 10, 2021     Record Record
Observed Daily Data   2021   2020   Norm   Depart   Highest Lowest
Maximum Humidity   99%   95%   93%   +6%   100%   in 2017   67%   in 1972  
Minimum Humidity   78%   60%   62%   +16%   88%   in 1954   35%   in 1999  
Average Humidity   89%   78%   77%   +11%   93%   in 1954   55%   in 1983  
Maximum Barometer   30.19   30.05   30.01   +00.18   30.38   in 1989   29.67   in 2011  
Minimum Barometer   30.08   29.95   29.82   +00.26   30.19   in 1993   29.30   in 1959  
Average Barometer   30.14   30.00   29.92   +00.22   30.26   in 1993   29.55   in 1959  
Average Wind   5.3   6.5   5.9   -0.6   18.3   in 1976   2.1   in 1989  
Direction   NNW   SW   SSW       SSE         SW        
High Wind Gust   25   30   21   +4   52   in 1976   11   in 1984  
Direction   NNW   SW   SSW       SSE         S        
High Heat Index   83   97   82   +1   97   in 2020            
Low Wind Chill                             #N/A   in #N/A  
Maximum Water Temp   72.3   71.4   72.4   -0.1   75.8   in 2018   69.4   in 2017  
Minimum Water Temp   69.3   67.8   69.3   +0.0   74.6   in 2012   65.9   in 2017  
Average Water Temp   70.8   69.6   70.9   -0.1   75.1   in 2012   67.7   in 2017  
Sunrise/ AM Twilight   5:50:11 AM   5:20:07 AM            
Sunset / PM Twilight   7:50:42 PM   8:20:47 PM            
Length Of Day   14:00:31                          
Special Conditions   None                              
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