Portsmouth Rhode Island Weather Almanac  
Friday, December 29, 2023  
Cloudy, Light Rain and Fog, Mostly Cloudy PM, Light Winds, Continued Warm  
  Climate Normal Period Climate Record Period
  1991 - 2020 1893 - 2023
    December 29, 2023   Record   Record  
Observed Daily Data   2023   2022   Norm   Depart   Highest   Lowest  
Maximum Temperature   45   50   40   +5   58   in 1984   14   in 1917  
Minimum Temperature   41   38   27   +14   47   in 1984   -8   in 1917  
Average Temperature   43   44   34   +9   53   in 1984   3   in 1917  
 Month Avg Max Temperature   47.2   42.2   43.4   +3.8   54.3   in 2015   30.3   in 1989  
Month Avg Min Temperature   35.1   29.5   30.2   +4.8   41.9   in 2015   14.1   in 1989  
Month Average Temperature   41.4   36.1   36.8   +4.6   48.4   in 2015   22.4   in 1989  
High Heat Index                   #N/A   in #N/A            
Low Wind Chill   35   34   17   +18             -23   in 1917  
Heating Degree Days   22   21   31   -9   62   in 1917   12   in 1984  
Month Heating DD   685   839   816   -131   1234   in 1989   480   in 2015  
Season Heating DD   1626   1660   1806   -180   2412   in 1904   1275   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   45   39   33   +12   53   in 2018   2   in 2017  
Minimum Dew Point   40   30   17   +23   45   in 1984   -9   in 1993  
Average  Dew Point   43   35   25   +18   48   in 2005   -1   in 2017  
 Month Avg Max Dew Point   40.8   35.0   34.2   +6.6   49.6   in 2015   15.2   in 1989  
Month Avg Min Dew Point   29.6   21.4   18.7   +10.9   36.3   in 2015   -1.2   in 1989  
Month Average Dew Point   35.5   28.5   26.5   +9.1   43.2   in 2015   7.0   in 1989  
Precipitation   .15   .00   .13   +.02   1.89   in 1901            
One Hour Rain   .06   .00           .35   in 2013            
Half Hour Rain   .04   .00           .19   in 2013            
Hourly Rain Rate   .09   .00           1.92   in 2005            
Month Precipitation   5.74   4.66   4.27   +1.47   9.28   in 1936   .58   in 1955  
Year Precipitation   54.79   42.47   45.70   +9.09   65.49   in 1983   27.66   in 1965  
Snow   0.0   0.0   0.3   -0.3   8.3   in 1945            
Snow Depth   0   0   1   -1   15   in 1947            
Month Snow   0.1   1.5   5.9   -5.8   21.7   in 1981   T   in 2011  
Season Snow   0.1   0.1   6.5   +6.5   22.9   in 1904   T   in 1999  
    December 29, 2023     Record Record
Observed Daily Data   2023   2022   Norm   Depart   Highest Lowest
Maximum Humidity   99%   91%   86%   +13%   100%   in 2018   54%   in 1952  
Minimum Humidity   96%   61%   57%   +39%   96%   in 2023   17%   in 1994  
Average Humidity   98%   76%   72%   +26%   98%   in 2023   39%   in 1949  
Maximum Barometer   29.68   30.34   30.14   -00.46   30.82   in 1933   29.49   in 1976  
Minimum Barometer   29.58   30.23   29.76   -00.18   30.43   in 2006   28.86   in 1956  
Average Barometer   29.63   30.29   29.95   -00.32   30.57   in 2006   29.34   in 1976  
Average Wind   4.9   6.3   7.9   -3.0   17.9   in 2009   1.5   in 1992  
Direction   SW   WSW   WNW       NW NNE
High Wind Gust   18   23   26   -8   47   in 2009   7   in 1992  
Direction   WSW   SSW   NW       NW NW
Maximum Water Temp   47.8   42.6   43.9   +3.9   49.0   in 2006   39.0   in 2010  
Minimum Water Temp   47.1   41.0   41.3   +5.8   47.1   in 2023   #N/A   in 2017  
Average Water Temp   47.5   41.8   42.6   +4.8   47.5   in 2023   37.2   in 2017  
Sunrise/ AM Twilight   7:11:08 AM   6:41:35 AM            
Sunset / PM Twilight   4:23:03 PM   4:53:05 PM            
Length Of Day   9:11:55                          
Special Conditions   Dense Fog                              
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