Portsmouth Rhode Island Weather Almanac  
Monday, August 9, 2021  
Cloudy, Heavy Rain AM, Mostly Cloudy Day to Cloudy, Light Rain PM, Light Winds, Cooler  
Climate Normal Period Climate Record Period  
1991- 2020   1893 - 2021  
    August 9, 2021   Record   Record  
Observed Daily Data   2021   2020   Norm   Depart   Highest   Lowest  
Maximum Temperature   79   84   79   +0   92   in 1980   66   in 1903  
Minimum Temperature   67   66   65   +2   73   in 1937   51   in 1955  
Average Temperature   73   75   72   +1   82   in 1980   63   in 1955  
 Month Avg Max Temperature   78.1   84.6   79.6   -1.4   86.9   in 1980   70.1   in 1903  
Month Avg Min Temperature   62.9   68.6   65.0   -2.1   71.2   in 1988   55.9   in 1964  
Month Average Temperature   70.8   76.7   72.0   -1.2   78.7   in 1980   64.2   in 1903  
HDD   0   0   0   +0   2   in 1955   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   10   7   +1   17   in 1980   0   in 1964  
Month CDD   52   105   70   -18   123   in 1980   6   in 1964  
Year CDD   442   569   398   +44   569   in 2020   192   in 1902  
Maximum Dew Point   73   73   69   +4   75   in 2018   54   in 1964  
Minimum Dew Point   64   64   61   +3   70   in 2003   39   in 1964  
Average  Dew Point   69   69   65   +4   72   in 2012   47   in 1964  
 Month Avg Max Dew Point   69.0   72.6   69.0   +0.0   75.0   in 2018   57.8   in 1964  
Month Avg Min Dew Point   60.2   63.7   61.3   -1.1   69.2   in 2003   47.6   in 1964  
Month Average Dew Point   64.6   68.1   65.0   -0.4   71.8   in 2018   52.7   in 1964  
Precipitation   .36   .00   .12   +.24   5.58   in 1992            
One Hour   .22   .00           .91   in 1992            
Hourly Rate   .93   .00           2.02   in 2013            
Month Precipitation   3.97   .12   1.07   +2.90   6.40   in 1946   .00   in 1998  
Year Precipitation   26.80   22.50   26.72   +.08   41.55   in 1998   14.69   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 9, 2021     Record Record
Observed Daily Data   2021   2020   Norm   Depart   Highest Lowest
Maximum Humidity   99%   95%   93%   +6%   100%   in 2003   74%   in 1971  
Minimum Humidity   80%   67%   59%   +21%   98%   in 1976   26%   in 1999  
Average Humidity   90%   81%   76%   +14%   99%   in 1976   56%   in 1979  
Maximum Barometer   30.17   30.14   30.03   +00.14   30.37   in 1998   29.69   in 2011  
Minimum Barometer   30.12   30.04   29.85   +00.27   30.24   in 1993   29.52   in 2011  
Average Barometer   30.15   30.09   29.94   +00.21   30.29   in 1993   29.61   in 2011  
Average Wind   4.0   5.7   5.7   -1.7   10.4   in 1982   2.0   in 1990  
Direction   ENE   SW   SW       S         S        
High Wind Gust   14   26   21   -7   37   in 1969   10   in 1997  
Direction   NE   SSW   SSW       SW         W        
High Heat Index   83   90   81   +2   98   in 2001            
Low Wind Chill                             #N/A   in #N/A  
Maximum Water Temp   72.2   70.3   72.1   +0.1   75.6   in 2012   68.2   in 2017  
Minimum Water Temp   69.5   67.8   69.1   +0.4   73.6   in 2018   65.4   in 2017  
Average Water Temp   70.9   69.1   70.6   +0.3   74.5   in 2018   66.8   in 2017  
Sunrise/ AM Twilight   5:49:11 AM   5:19:00 AM            
Sunset / PM Twilight   7:52:02 PM   8:22:13 PM            
Length Of Day   14:02:51                          
Special Conditions   Fog                                  
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