Portsmouth Rhode Island Weather Almanac  
Friday, December 15, 2023  
Clear and Much Warmer  
  Climate Normal Period Climate Record Period
  1991 - 2020 1893 - 2023
    December 15, 2023   Record   Record  
Observed Daily Data   2023   2022   Norm   Depart   Highest   Lowest  
Maximum Temperature   53   41   44   +9   61   in 2015   24   in 2010  
Minimum Temperature   35   30   30   +5   48   in 2015   9   in 1900  
Average Temperature   44   36   37   +7   55   in 2015   18   in 1900  
 Month Avg Max Temperature   47.1   44.7   45.0   +2.1   54.8   in 2015   30.1   in 1904  
Month Avg Min Temperature   35.2   32.9   31.9   +3.3   42.3   in 2015   16.1   in 1989  
Month Average Temperature   41.4   39.1   38.4   +3.0   48.9   in 2015   24.6   in 1904  
High Heat Index                   #N/A   in #N/A            
Low Wind Chill   29   22   19   +10             -4   in 1980  
Heating Degree Days   21   29   28   -7   47   in 1900   10   in 2015  
Month Heating DD   354   389   398   -44   606   in 1904   242   in 2015  
Season Heating DD   1295   1210   1388   -93   1918   in 1904   1037   in 2015  
Cooling Degree Days   0   0   0   +0       in     0   in Many  
Month Cooling DD   0   0   0   +0   3   in 2022   0   in Many  
Year Cooling DD   726   784   609   +117   871   in 2020   290   in 1902  
Maximum Dew Point   39   40   36   +3   60   in 2015   10   in 2010  
Minimum Dew Point   26   25   21   +5   43   in 2008   -5   in 2016  
Average  Dew Point   33   33   28   +5   50   in 2015   4   in 1961  
 Month Avg Max Dew Point   40.7   38.8   36.3   +4.3   49.1   in 2015   18.0   in 1989  
Month Avg Min Dew Point   29.5   24.2   21.3   +8.1   38.0   in 2015   -1.5   in 1989  
Month Average Dew Point   35.3   31.7   28.8   +6.5   43.7   in 2015   8.3   in 1989  
Precipitation   .00   T   .15   -.15   1.79   in 1981            
One Hour Rain   .00   T           .60   in 1987            
Half Hour Rain   .00   .00           .14   in 2013            
Hourly Rain Rate   .00   .00           .42   in 2013            
Month Precipitation   2.43   1.96   2.26   +.17   6.64   in 1936   .20   in 1998  
Year Precipitation   51.48   39.77   43.69   +7.79   63.81   in 1983   27.09   in 1965  
Snow   0.0   0.0   0.2   -0.2   7.1   in 1905            
Snow Depth   0   0   1   -1   11   in 1904            
Month Snow   0.1   1.5   2.6   -2.5   19.9   in 1981   0.0   in 2015  
Season Snow   0.1   1.5   3.2   +3.2   21.1   in 1898   0.0   in 2015  
    December 15, 2023     Record Record
Observed Daily Data   2023   2022   Norm   Depart   Highest Lowest
Maximum Humidity   81%   97%   86%   -5%   100%   in 2018   49%   in 1961  
Minimum Humidity   56%   75%   57%   -1%   96%   in 1993   17%   in 1959  
Average Humidity   69%   86%   71%   -3%   98%   in 1993   42%   in 1961  
Maximum Barometer   30.41   30.27   30.15   +00.26   30.70   in 2021   29.24   in 1954  
Minimum Barometer   30.18   30.06   29.81   +00.37   30.46   in 1994   29.05   in 1968  
Average Barometer   30.30   30.17   29.98   +00.31   30.51   in 1994   29.16   in 1954  
Average Wind   7.6   8.2   8.7   -1.1   19.1   in 1961   2.6   in 2014  
Direction   SW   NNW   WNW       NNW WNW
High Wind Gust   23   22   27   -4   53   in 1953   11   in 1992  
Direction   WNW   NNE   WNW       WSW WSW
Maximum Water Temp   46.6   46.0   46.2   +0.4   51.9   in 2015   41.5   in 1997  
Minimum Water Temp   44.6   42.6   43.6   +1.0   50.7   in 2015   38.7   in 2010  
Average Water Temp   45.6   44.3   44.9   +0.7   51.3   in 2015   40.1   in 1997  
Sunrise/ AM Twilight   7:04:25 AM   6:35:03 AM            
Sunset / PM Twilight   4:15:46 PM   4:45:36 PM            
Length Of Day   9:11:21                          
Special Conditions   None                              
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