Portsmouth Rhode Island Weather Almanac  
Wednesday, July 28, 2021  
Cloudy & Light Rain early, Mostly Cloudy Day to Partly Cloudy PM, Cooler  
Climate Normal Period Climate Record Period  
1991- 2020   1893 - 2021  
    July 28, 2021   Record   Record  
Observed Daily Data   2021   2020   Norm   Depart   Highest   Lowest  
Maximum Temperature   77   93   80   -3   93   in 2020   66   in 1911  
Minimum Temperature   61   75   65   -4   75   in 2020   54   in 2001  
Average Temperature   69   84   73   -4   84   in 2020   63   in 1914  
 Month Avg Max Temperature   79.2   83.2   79.7   -0.5   84.6   in 1952   73.8   in 1902  
Month Avg Min Temperature   65.1   66.9   64.6   +0.5   70.1   in 2013   59.2   in 1962  
Month Average Temperature   72.4   75.4   72.5   -0.1   76.3   in 2013   67.6   in 1902  
HDD   0   0   0   +0   2   in 1914   0   in    
Month HDD   9   0   3   +6   25   in 1914   0   in 2020  
Season HDD   9   0   3   +6   25   in 1914   0   in 2020  
CDD   4   19   8   -4   19   in 2020   0   in 2001  
Month CDD   217   290   211   +6   316   in 2013   87   in 1902  
Year CDD   379   423   304   +75   450   in 2010   112   in 1902  
Maximum Dew Point   66   76   70   -4   76   in 2020   56   in 1962  
Minimum Dew Point   57   66   61   -4   70   in 2007   47   in 2001  
Average  Dew Point   62   71   65   -3   73   in 2006   52   in 2001  
 Month Avg Max Dew Point   70.6   71.6   68.6   +2.0   73.4   in 2013   61.8   in 1962  
Month Avg Min Dew Point   62.1   63.7   60.2   +2.0   67.4   in 2013   52.1   in 1965  
Month Average Dew Point   66.4   67.7   64.4   +2.0   70.4   in 2013   56.9   in 1962  
Precipitation   .01   .00   .10   -.09   3.17   in 2012            
One Hour   .01   .00           2.51   in 2012            
Hourly Rate   .00   .00           7.02   in 2015            
Month Precipitation   3.63   1.30   2.78   +.85   8.73   in 2009   .36   in 1952  
Year Precipitation   22.69   22.32   25.35   -2.66   41.06   in 1998   13.93   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 28, 2021     Record Record
Observed Daily Data   2021   2020   Norm   Depart   Highest Lowest
Maximum Humidity   94%   88%   93%   +1%   100%   in 2017   75%   in 1968  
Minimum Humidity   62%   51%   62%   -0%   94%   in 2004   26%   in 1999  
Average Humidity   78%   70%   78%   +0%   97%   in 2004   56%   in 1999  
Maximum Barometer   30.05   29.86   30.01   +00.04   30.32   in 2001   29.67   in 2014  
Minimum Barometer   29.91   29.70   29.83   +00.08   30.21   in 1996   29.44   in 1989  
Average Barometer   29.98   29.78   29.92   +00.06   30.26   in 1996   29.57   in 2014  
Average Wind   4.0   6.0   5.4   -1.4   10.3   in 1969   2.1   in 2004  
Direction   NNE   SW   S       S         N        
High Wind Gust   18   28   21   -3   42   in 1989   12   in 2011  
Direction   NNE   SW   SSW       NNW         S        
High Heat Index   78   104   83   -5   104   in 2020            
Low Wind Chill                             #N/A   in #N/A  
Maximum Water Temp   74.3   71.1   71.7   +2.6   74.5   in 2007   68.2   in 2004  
Minimum Water Temp   72.5   66.2   68.3   +4.2   72.5   in 2021   61.3   in 2003  
Average Water Temp   73.4   68.7   70.0   +3.4   73.4   in 2021   66.7   in 2004  
Sunrise/ AM Twilight   5:37:15 AM   5:05:50 AM            
Sunset / PM Twilight   8:06:14 PM   8:37:39 PM            
Length Of Day   14:28:59                          
Special Conditions   Fog                                  
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