Portsmouth Rhode Island Weather Almanac  
Sunday, July 4, 2021  
Cloudy, Light Rain early, Partly Cloudy PM, Light Winds, Continued Very Cool  
Climate Normal Period Climate Record Period  
1991- 2020   1893 - 2021  
    July 4, 2021   Record   Record  
Observed Daily Data   2021   2020   Norm   Depart   Highest   Lowest  
Maximum Temperature   68   80   79   -11   95   in 1949   64   in 1978  
Minimum Temperature   55   63   64   -9   72   in 2018   52   in 1914  
Average Temperature   62   72   72   -10   83   in 1919   60   in 1978  
 Month Avg Max Temperature   71.0   80.0   78.8   -7.8   88.5   in 1955   68.3   in 1914  
Month Avg Min Temperature   59.8   63.0   63.3   -3.5   70.8   in 1901   53.0   in 1962  
Month Average Temperature   65.8   72.0   71.3   -5.5   79.0   in 2002   61.3   in 1914  
HDD   3   0   0   +3   5   in 1978   0   in    
Month HDD   9   0   3   +6   15   in 1914   0   in 2020  
Season HDD   9   0   3   +6   15   in 1914   0   in 2020  
CDD   0   7   7   -7   18   in 1919   0   in 2021  
Month CDD   12   28   25   -13   56   in 2002   0   in 1914  
Year CDD   174   161   118   +56   196   in 1957   31   in 1972  
Maximum Dew Point   61   69   68   -7   76   in 2018   52   in 1963  
Minimum Dew Point   54   61   59   -5   70   in 2002   40   in 1982  
Average  Dew Point   58   65   63   -5   73   in 2018   47   in 1982  
 Month Avg Max Dew Point   65.5   69.8   67.3   -1.8   74.8   in 2018   50.3   in 1982  
Month Avg Min Dew Point   58.0   60.8   58.8   -0.8   68.5   in 2013   42.3   in 1982  
Month Average Dew Point   61.8   65.3   63.0   -1.3   70.6   in 2013   46.3   in 1982  
Precipitation   .03   .00   .11   -.08   3.01   in 2014            
One Hour   .02   .00           .58   in 2014            
Hourly Rate   .04   .00           2.95   in 2014            
Month Precipitation   2.02   T   .44   +1.58   3.01   in 2014   .00   in 2019  
Year Precipitation   21.08   21.02   23.01   -1.93   40.39   in 1998   12.92   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 4, 2021     Record Record
Observed Daily Data   2021   2020   Norm   Depart   Highest Lowest
Maximum Humidity   97%   94%   92%   +5%   100%   in 2003   56%   in 1953  
Minimum Humidity   74%   67%   56%   +18%   88%   in 1973   30%   in 1956  
Average Humidity   86%   81%   74%   +11%   94%   in 1973   45%   in 1953  
Maximum Barometer   30.02   29.95   30.01   +00.01   30.34   in 1988   29.63   in 1996  
Minimum Barometer   29.81   29.87   29.81   -00.00   30.22   in 2018   29.47   in 1990  
Average Barometer   29.92   29.91   29.91   +00.00   30.27   in 2018   29.56   in 1996  
Average Wind   3.5   5.1   5.6   -2.1   13.1   in 1978   1.8   in 1995  
Direction   NNW   NNE   SW       NE         SSW        
High Wind Gust   13   20   20   -7   36   in 2014   11   in 2015  
Direction   WNW   NNE   SW       N         ESE        
High Heat Index   68   82   80   -12   100   in 2002            
Low Wind Chill                             #N/A   in #N/A  
Maximum Water Temp   69.2   63.5   69.8   -0.6   76.6   in 2002   63.5   in 2020  
Minimum Water Temp   67.0   60.4   65.2   +1.8   70.2   in 1998   60.3   in 2003  
Average Water Temp   68.1   62.0   67.5   +0.6   71.8   in 2002   62.0   in 2020  
Sunrise/ AM Twilight   5:17:32 AM   4:44:00 AM            
Sunset / PM Twilight   8:22:14 PM   8:55:46 PM            
Length Of Day   15:04:42                          
Special Conditions   Fog                                  
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