Portsmouth Rhode Island Weather Almanac  
Sunday, September 5, 2021  
Partly Cloudy early, Mostly Cloudy Day to Cloudy, Light Rain & Fog Late, Seasonal Temps  
  Climate Normal Period Climate Record Period
  1991 - 2020 1893 - 2021
    September 5, 2021   Record   Record  
Observed Daily Data   2021   2020   Norm   Depart   Highest   Lowest  
Maximum Temperature   74   79   75   -1   91   in 1961   59   in 1994  
Minimum Temperature   62   60   60   +2   72   in 1953   47   in 1906  
Average Temperature   68   70   68   +0   80   in 1961   56   in 1994  
 Month Avg Max Temperature   74.2   79.2   76.0   -1.8   86.6   in 1898   66.6   in 1994  
Month Avg Min Temperature   59.6   63.8   61.0   -1.4   70.6   in 1959   51.4   in 1893  
Month Average Temperature   67.2   71.8   68.4   -1.2   78.8   in 1898   60.8   in 1994  
High Heat Index   74   77   77   -3   102   in 1961            
Low Wind Chill                             #N/A   in #N/A  
HDD   0   0   1   -1   9   in 1994   0   in    
Month HDD   0   0   5   -5   25   in 1994   0   in 2021  
Season HDD   9   0   12   -3   42   in 1905   0   in 2020  
CDD   3   5   3   +0   15   in 1961   0   in 2019  
Month CDD   11   34   21   -10   69   in 1898   0   in 1986  
Year CDD   694   800   558   +136   800   in 2020   272   in 1902  
Maximum Dew Point   68   58   65   +3   74   in 2008   50   in 1965  
Minimum Dew Point   60   46   56   +4   69   in 1953   35   in 2000  
Average  Dew Point   64   52   61   +3   71   in 2008   43   in 2000  
 Month Avg Max Dew Point   64.2   67.8   65.4   -1.2   73.4   in 1973   54.4   in 1987  
Month Avg Min Dew Point   55.6   56.0   56.6   -1.0   67.6   in 1959   44.4   in 1967  
Month Average Dew Point   60.2   62.0   61.0   -0.8   70.3   in 1973   49.6   in 1987  
Precipitation   .07   .00   .11   -.04   2.84   in 1991            
One Hour   .06   .00           .67   in 1991            
Hourly Rate   .32   .00           2.09   in 2012            
Month Precipitation   6.52   .39   .55   +5.97   6.52   in 2021   .00   in 2019  
Year Precipitation   35.62   24.42   29.83   +5.79   45.30   in 1998   16.55   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  
    September 5, 2021     Record Record
Observed Daily Data   2021   2020   Norm   Depart   Highest Lowest
Maximum Humidity   96%   79%   92%   +4%   100%   in 2003   78%   in 1998  
Minimum Humidity   74%   33%   56%   +18%   92%   in 1991   32%   in 2007  
Average Humidity   85%   56%   74%   +11%   96%   in 1991   56%   in 2020  
Maximum Barometer   29.94   30.18   30.11   -00.17   30.57   in 1989   29.66   in 1988  
Minimum Barometer   29.80   30.00   29.91   -00.11   30.28   in 2004   29.15   in 1988  
Average Barometer   29.87   30.09   30.01   -00.14   30.39   in 1989   29.41   in 1988  
Average Wind   6.5   6.0   5.8   +0.7   13.5   in 2016   1.6   in 2006  
Direction   SW   NNW   SSW       NNE         SSW        
High Wind Gust   23   21   20   +3   41   in 2016   11   in 1952  
Direction   SW   SW   SW       NNE         SW        
Maximum Water Temp   72.0   70.9   70.4   +1.6   73.8   in 2018   66.9   in 1997  
Minimum Water Temp   70.2   68.5   67.8   +2.4   71.5   in 2018   64.7   in 2017  
Average Water Temp   71.1   69.7   69.1   +2.0   72.7   in 2018   65.9   in 2017  
Sunrise/ AM Twilight   6:14:34 AM   5:47:48 AM            
Sunset / PM Twilight   7:13:02 PM   7:39:48 PM            
Length Of Day   12:58:28                          
Special Conditions   Fog                                  
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