Portsmouth Rhode Island Weather Almanac  
Sunday, July 11, 2021  
Partly Cloudy to Cloudy PM, Light Winds and Cooler  
Climate Normal Period Climate Record Period  
1991- 2020   1893 - 2021  
    July 11, 2021   Record   Record  
Observed Daily Data   2021   2020   Norm   Depart   Highest   Lowest  
Maximum Temperature   77   81   80   -3   91   in 1993   64   in 1917  
Minimum Temperature   59   71   65   -6   74   in 1911   53   in 1953  
Average Temperature   68   76   73   -5   83   in 1911   61   in 1917  
 Month Avg Max Temperature   75.9   79.9   79.3   -3.4   86.6   in 1955   70.6   in 1914  
Month Avg Min Temperature   62.5   65.5   63.8   -1.3   70.6   in 2013   55.9   in 1962  
Month Average Temperature   69.5   73.0   71.8   -2.3   76.6   in 1955   64.1   in 1914  
HDD   0   0   0   +0   4   in 1917   0   in    
Month HDD   9   0   3   +6   23   in 1914   0   in 2020  
Season HDD   9   0   3   +6   23   in 1914   0   in 2020  
CDD   3   11   8   -5   18   in 1911   0   in 2016  
Month CDD   59   88   75   -16   128   in 1955   13   in 1914  
Year CDD   221   221   168   +53   258   in 2010   40   in 1972  
Maximum Dew Point   70   74   69   +1   75   in 2011   50   in 2002  
Minimum Dew Point   56   70   60   -4   70   in 2020   41   in 1989  
Average  Dew Point   63   72   64   -1   72   in 2020   47   in 2002  
 Month Avg Max Dew Point   69.2   70.9   67.8   +1.4   73.7   in 2013   58.1   in 1982  
Month Avg Min Dew Point   60.3   63.3   59.3   +1.0   68.5   in 2013   48.0   in 1962  
Month Average Dew Point   64.7   67.1   63.5   +1.2   71.1   in 2013   53.5   in 1982  
Precipitation   .00   .00   .10   -.10   1.78   in 1959            
One Hour   .00   .00           .46   in 1959            
Hourly Rate   .00   .00           4.47   in 2013            
Month Precipitation   3.44   .14   1.16   +2.28   4.76   in 2009   .00   in 2019  
Year Precipitation   22.50   21.16   23.73   -1.23   40.76   in 1998   13.04   in 1957  
Snow   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 11, 2021     Record Record
Observed Daily Data   2021   2020   Norm   Depart   Highest Lowest
Maximum Humidity   95%   96%   91%   +4%   100%   in 2007   72%   in 1971  
Minimum Humidity   72%   76%   56%   +16%   89%   in 2006   28%   in 1981  
Average Humidity   84%   86%   73%   +10%   95%   in 1984   56%   in 2005  
Maximum Barometer   30.14   29.85   30.01   +00.13   30.33   in 1996   29.75   in 2001  
Minimum Barometer   30.05   29.68   29.81   +00.24   30.13   in 1996   29.50   in 1976  
Average Barometer   30.10   29.77   29.91   +00.18   30.23   in 1996   29.63   in 1973  
Average Wind   3.5   8.3   5.6   -2.1   10.5   in 1974   2.1   in 1971  
Direction   NNW   S   SSW       N         N        
High Wind Gust   15   26   21   -6   36   in 2001   10   in 1971  
Direction   WSW   S   SSW       WNW         WSW        
High Heat Index   79   86   80   -1   95   in 2010            
Low Wind Chill                             #N/A   in #N/A  
Maximum Water Temp   70.2   66.2   69.8   +0.4   74.4   in 2012   64.8   in 2003  
Minimum Water Temp   69.4   64.0   65.8   +3.6   70.1   in 2012   61.6   in 2006  
Average Water Temp   69.8   65.1   67.8   +2.0   72.3   in 2012   63.7   in 2003  
Sunrise/ AM Twilight   5:22:20 AM   4:49:18 AM            
Sunset / PM Twilight   8:19:30 PM   8:52:33 PM            
Length Of Day   14:57:10                          
Special Conditions   None                              
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