Portsmouth Rhode Island Weather Almanac  
Saturday, August 12, 2023  
Clear, Calm Winds early, P Cloudy Day to Mostly Cloudy, Light Rain PM, Cooler  
  Climate Normal Period Climate Record Period
  1991 - 2020 1893 - 2023
    August 12, 2023   Record   Record  
Observed Daily Data   2023   2022   Norm   Depart   Highest   Lowest  
Maximum Temperature   81   84   79   +2   92   in 1944   63   in 1979  
Minimum Temperature   61   68   64   -3   74   in 2020   51   in 1968  
Average Temperature   71   76   72   -1   82   in 2020   60   in 1979  
 Month Avg Max Temperature   79.5   84.3   79.4   +0.1   85.5   in 2020   71.5   in 1903  
Month Avg Min Temperature   63.7   70.3   64.8   -1.1   71.9   in 1988   56.3   in 1964  
Month Average Temperature   71.8   77.6   72.0   -0.2   78.6   in 1988   64.8   in 1964  
High Heat Index   86   86   81   +5   102   in 2020            
Low Wind Chill                             48   in 1968  
Heating Degree Days   0   0   0   +0   5   in 1979   0   in 2023  
Month Heating DD   0   0   0   +0   18   in 1903   0   in 2023  
Season Heating DD   0   0   0   +0   18   in 1903   0   in 2023  
Cooling Degree Days   6   11   7   -1   17   in 2020   0   in 1983  
Month Cooling DD   82   151   91   -9   163   in 1988   11   in 1964  
Year Cooling DD   466   539   419   +47   616   in 2020   203   in 1902  
Maximum Dew Point   74   68   69   +5   78   in 2020   50   in 1968  
Minimum Dew Point   57   58   60   -3   71   in 2020   44   in 2006  
Average  Dew Point   66   63   64   +2   75   in 2020   47   in 1968  
 Month Avg Max Dew Point   68.3   75.0   69.0   -0.8   75.0   in 2022   58.9   in 1964  
Month Avg Min Dew Point   58.8   67.6   61.1   -2.3   69.4   in 2003   48.4   in 1964  
Month Average Dew Point   63.5   71.3   64.9   -1.4   71.4   in 2003   53.7   in 1964  
Precipitation   .06   .00   .12   -.06   2.30   in 1983            
One Hour Rain   .06   .00           .92   in 1983            
Half Hour Rain   .04   .00           .10   in 2017            
Hourly Rain Rate   .19   .00           .87   in 2016            
Month Precipitation   2.72   .42   1.43   +1.29   6.82   in 1952   .00   in 1911  
Year Precipitation   32.97   23.83   27.08   +5.89   43.87   in 1983   15.63   in 1957  
Snow                                      
Snow Depth                                      
Month Snow                                      
Season Snow   0.0   0.0   0.0   +0.0   0.0   in 1996   0.0   in 1998  
    August 12, 2023     Record Record
Observed Daily Data   2023   2022   Norm   Depart   Highest Lowest
Maximum Humidity   96%   98%   94%   +2%   100%   in 2018   63%   in 1950  
Minimum Humidity   56%   46%   61%   -5%   92%   in 1955   33%   in 1974  
Average Humidity   76%   72%   78%   -2%   96%   in 1955   52%   in 1950  
Maximum Barometer   29.94   30.03   30.05   -00.11   30.34   in 1986   29.77   in 2008  
Minimum Barometer   29.87   29.89   29.86   +00.01   30.17   in 1994   29.53   in 1964  
Average Barometer   29.91   29.96   29.96   -00.05   30.23   in 1994   29.68   in 1964  
Average Wind   4.9   5.0   5.6   -0.7   12.5   in 1979   1.8   in 1994  
Direction   SSE   SSE   SSW       NNE SSE
High Wind Gust   16   16   20   -4   34   in 1983   9   in 1951  
Direction   SSW   NE   WSW       NNE SE
Maximum Water Temp   74.1   72.3   72.2   +1.9   77.0   in 2003   68.3   in 2017  
Minimum Water Temp   71.8   70.7   68.9   +2.9   73.8   in 2012   63.6   in 2004  
Average Water Temp   73.0   71.5   70.6   +2.4   75.0   in 2012   66.9   in 2017  
Sunrise/ AM Twilight   5:50:31 AM   4:50:09 AM            
Sunset / PM Twilight   7:49:02 PM   8:51:57 PM            
Length Of Day   13:58:31                          
Special Conditions   Light Fog                              
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