Portsmouth Rhode Island Weather Almanac  
Thursday, July 29, 2021  
Partly Cloudy to Cloudy and Rain PM, Breezy and Continued Cool  
Climate Normal Period Climate Record Period  
1991- 2020   1893 - 2021  
    July 29, 2021   Record   Record  
Observed Daily Data   2021   2020   Norm   Depart   Highest   Lowest  
Maximum Temperature   76   87   80   -4   92   in 1949   67   in 1926  
Minimum Temperature   60   70   65   -5   73   in 1995   55   in 1977  
Average Temperature   68   79   73   -5   82   in 1949   62   in 1914  
 Month Avg Max Temperature   79.1   83.3   79.7   -0.7   84.8   in 1952   74.0   in 1902  
Month Avg Min Temperature   64.9   67.0   64.6   +0.3   70.0   in 2013   59.3   in 1962  
Month Average Temperature   72.3   75.5   72.6   -0.3   76.2   in 2013   67.8   in 1902  
HDD   0   0   0   +0   3   in 1914   0   in    
Month HDD   9   0   3   +6   28   in 1914   0   in 2020  
Season HDD   9   0   3   +6   28   in 1914   0   in 2020  
CDD   3   14   8   -5   17   in 1949   0   in 2017  
Month CDD   220   304   219   +1   326   in 2013   95   in 1902  
Year CDD   382   437   312   +70   463   in 2010   120   in 1902  
Maximum Dew Point   67   71   70   -3   75   in 2016   50   in 1968  
Minimum Dew Point   57   60   61   -4   70   in 2007   44   in 1968  
Average  Dew Point   62   66   65   -3   73   in 1995   47   in 1968  
 Month Avg Max Dew Point   70.4   71.6   68.6   +1.8   73.4   in 2013   61.9   in 1962  
Month Avg Min Dew Point   62.0   63.6   60.2   +1.8   67.4   in 2013   52.0   in 1965  
Month Average Dew Point   66.2   67.6   64.4   +1.8   70.4   in 2013   57.1   in 1965  
Precipitation   .14   .00   .10   +.04   2.10   in 1897            
One Hour   .07   .00           .90   in 2002            
Hourly Rate   .55   .00           .83   in 2016            
Month Precipitation   3.77   1.30   2.88   +.89   8.73   in 2009   .36   in 1952  
Year Precipitation   22.83   22.32   25.45   -2.62   41.06   in 1998   14.31   in 1957  
Snow   0.0   0.0   0.0   +0.0   0.0   in              
Snow Depth   0   0           0   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  
    July 29, 2021     Record Record
Observed Daily Data   2021   2020   Norm   Depart   Highest Lowest
Maximum Humidity   95%   94%   93%   +2%   100%   in 2016   70%   in 1956  
Minimum Humidity   58%   41%   61%   -3%   93%   in 1986   33%   in 1968  
Average Humidity   77%   68%   77%   -1%   97%   in 1986   52%   in 1968  
Maximum Barometer   30.06   29.94   30.01   +00.05   30.33   in 1984   29.77   in 1966  
Minimum Barometer   29.72   29.86   29.82   -00.10   30.24   in 1996   29.48   in 1981  
Average Barometer   29.89   29.90   29.91   -00.02   30.28   in 1996   29.65   in 1966  
Average Wind   7.7   4.9   5.5   +2.2   11.4   in 1968   1.6   in 1996  
Direction   S   SW   S       WNW         SSE        
High Wind Gust   26   21   20   +6   44   in 1941   10   in 1991  
Direction   SW   SW   S       NE         NNE        
High Heat Index   77   89   82   -5   96   in 2019            
Low Wind Chill                             #N/A   in #N/A  
Maximum Water Temp   73.8   69.4   71.6   +2.2   74.6   in 2006   68.5   in 2017  
Minimum Water Temp   72.3   64.0   68.0   +4.3   72.3   in 2021   60.6   in 2003  
Average Water Temp   73.1   66.7   69.8   +3.2   73.1   in 2021   66.3   in 2017  
Sunrise/ AM Twilight   5:38:13 AM   5:06:54 AM            
Sunset / PM Twilight   8:05:11 PM   8:36:30 PM            
Length Of Day   14:26:58                          
Special Conditions   None                              
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