Portsmouth Rhode Island Weather Almanac  
Tuesday, December 19, 2023  
Mostly Cloudy early, Partly Cloudy Day to Clear PM, Breezy, Much Colder  
  Climate Normal Period Climate Record Period
  1991 - 2020 1893 - 2023
    December 19, 2023   Record   Record  
Observed Daily Data   2023   2022   Norm   Depart   Highest   Lowest  
Maximum Temperature   47   40   42   +5   57   in 1899   19   in 1919  
Minimum Temperature   33   30   29   +4   41   in 1996   3   in 1919  
Average Temperature   40   35   36   +4   48   in 1899   11   in 1919  
 Month Avg Max Temperature   48.5   44.3   44.5   +3.9   53.8   in 2015   31.3   in 1904  
Month Avg Min Temperature   35.8   33.2   31.4   +4.4   41.4   in 2015   16.2   in 1989  
Month Average Temperature   42.4   39.0   37.9   +4.5   47.9   in 2015   24.9   in 1989  
High Heat Index                   #N/A   in #N/A            
Low Wind Chill   24   21   13   +11             -11   in 1979  
Heating Degree Days   25   30   29   -4   54   in 1919   17   in 1899  
Month Heating DD   430   494   514   -84   761   in 1989   325   in 2015  
Season Heating DD   1371   1315   1504   -133   2066   in 1904   1120   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   40   27   35   +5   54   in 1990   4   in 1991  
Minimum Dew Point   25   23   20   +5   41   in 1996   -14   in 1979  
Average  Dew Point   33   25   27   +6   45   in 1996   0   in 1979  
 Month Avg Max Dew Point   42.1   38.2   35.7   +6.4   48.5   in 2015   17.9   in 1989  
Month Avg Min Dew Point   30.3   25.1   20.5   +9.8   36.2   in 2015   -0.2   in 1989  
Month Average Dew Point   36.5   31.9   28.1   +8.4   42.5   in 2015   8.9   in 1989  
Precipitation   .00   .00   .15   -.15   1.95   in 1986            
One Hour Rain   .00   .00           .41   in 1986            
Half Hour Rain   .00   .00           .10   in 2007            
Hourly Rain Rate   .00   .00           .36   in 2007            
Month Precipitation   4.63   3.55   2.86   +1.77   7.88   in 1936   .27   in 1998  
Year Precipitation   53.68   41.36   44.29   +9.39   63.81   in 1983   27.14   in 1965  
Snow   0.0   0.0   0.2   -0.2   8.8   in 2008            
Snow Depth   0   0   1   -1   18   in 1904            
Month Snow   0.1   1.5   3.4   -3.3   21.3   in 1981   0.0   in 2015  
Season Snow   0.1   1.5   4.0   +4.0   21.3   in 1981   0.0   in 2015  
    December 19, 2023     Record Record
Observed Daily Data   2023   2022   Norm   Depart   Highest Lowest
Maximum Humidity   85%   78%   83%   +2%   100%   in 2001   57%   in 1978  
Minimum Humidity   62%   55%   54%   +8%   96%   in 1993   33%   in 2009  
Average Humidity   74%   67%   69%   +5%   98%   in 1993   46%   in 1978  
Maximum Barometer   30.19   30.19   30.17   +00.02   30.74   in 1991   29.68   in 1963  
Minimum Barometer   29.63   29.96   29.84   -00.21   30.46   in 1964   29.25   in 1969  
Average Barometer   29.91   30.08   30.00   -00.09   30.55   in 1964   29.51   in 1986  
Average Wind   8.3   12.0   8.3   +0.0   18.5   in 1977   3.0   in 2007  
Direction   NW   NW   WNW       NE E
High Wind Gust   23   32   26   -3   49   in 1986   13   in 2020  
Direction   NW   NW   NW       ENE NNW
Maximum Water Temp   49.5   46.0   45.6   +3.9   50.4   in 2006   40.6   in 2018  
Minimum Water Temp   47.3   43.7   42.9   +4.4   48.7   in 2015   37.9   in 2018  
Average Water Temp   48.4   44.9   44.3   +4.1   49.5   in 2015   39.3   in 2018  
Sunrise/ AM Twilight   7:07:01 AM   6:37:33 AM            
Sunset / PM Twilight   4:17:08 PM   4:47:07 PM            
Length Of Day   9:10:07                          
Special Conditions   None                              
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