Portsmouth Rhode Island Weather Almanac  
Monday, December 11, 2023  
Cloudy, Heavy Rain, Fog & Warm AM to Partly Cloudy and Much Cooler PM  
  Climate Normal Period Climate Record Period
  1991 - 2020 1893 - 2023
    December 11, 2023   Record   Record  
Observed Daily Data   2023   2022   Norm   Depart   Highest   Lowest  
Maximum Temperature   59   34   44   +15   65   in 1971   19   in 1977  
Minimum Temperature   36   29   31   +5   47   in 2015   8   in 1977  
Average Temperature   48   32   38   +10   53   in 2015   14   in 1977  
 Month Avg Max Temperature   48.3   47.4   45.5   +2.8   55.0   in 1953   30.5   in 1904  
Month Avg Min Temperature   36.5   35.5   32.5   +4.0   41.4   in 1998   16.0   in 1989  
Month Average Temperature   42.6   41.6   38.9   +3.7   48.2   in 1998   25.5   in 1904  
High Heat Index                   #N/A   in #N/A            
Low Wind Chill   27   19   20   +7             -13   in 1977  
Heating Degree Days   17   33   27   -10   51   in 1977   12   in 2015  
Month Heating DD   246   257   287   -41   434   in 1904   185   in 1998  
Season Heating DD   1187   1078   1277   -90   1746   in 1904   996   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   58   32   37   +21   59   in 2021   -4   in 1977  
Minimum Dew Point   27   25   22   +5   47   in 2015   -15   in 1980  
Average  Dew Point   43   29   30   +13   52   in 2015   -9   in 1977  
 Month Avg Max Dew Point   43.6   42.2   37.0   +6.6   47.4   in 2001   19.1   in 1989  
Month Avg Min Dew Point   32.7   27.0   22.2   +10.6   36.5   in 2015   -1.8   in 1989  
Month Average Dew Point   38.5   34.8   29.6   +8.9   42.0   in 2015   8.6   in 1989  
Precipitation   1.31   .11   .15   +1.16   2.79   in 1992            
One Hour Rain   .40   .00           .41   in 2008            
Half Hour Rain   .31   .00           .31   in 2023            
Hourly Rain Rate   4.57   .00           4.57   in 2023            
Month Precipitation   2.43   1.94   1.66   +.77   5.89   in 1936   .00   in 1946  
Year Precipitation   51.48   39.75   43.09   +8.39   61.88   in 1983   26.29   in 1965  
Snow   0.0   1.4   0.2   -0.2   3.8   in 2019            
Snow Depth   0   0   0   -0   10   in 1981            
Month Snow   0.1   1.4   1.8   -1.7   17.0   in 1981   0.0   in 2015  
Season Snow   0.1   1.4   2.4   +2.4   19.5   in 1898   0.0   in 2015  
    December 11, 2023     Record Record
Observed Daily Data   2023   2022   Norm   Depart   Highest Lowest
Maximum Humidity   99%   99%   87%   +12%   100%   in 2021   45%   in 1990  
Minimum Humidity   69%   82%   57%   +12%   92%   in 2008   20%   in 1980  
Average Humidity   84%   91%   72%   +12%   96%   in 2021   35%   in 1990  
Maximum Barometer   30.10   30.39   30.16   -00.06   30.78   in 1983   29.42   in 2004  
Minimum Barometer   29.45   30.05   29.82   -00.37   30.46   in 2011   29.18   in 1969  
Average Barometer   29.78   30.22   29.99   -00.22   30.61   in 1983   29.35   in 1957  
Average Wind   15.1   10.6   8.4   +6.7   21.9   in 1952   2.1   in 1996  
Direction   WNW   N   N       SE ENE
High Wind Gust   38   22   26   +12   64   in 1943   13   in 2006  
Direction   S   N   N       NW W
Maximum Water Temp   50.7   47.7   47.2   +3.5   51.2   in 2011   42.6   in 2019  
Minimum Water Temp   49.5   45.7   44.7   +4.8   50.4   in 2015   39.1   in 2002  
Average Water Temp   50.1   46.7   46.0   +4.1   50.6   in 2015   41.2   in 2010  
Sunrise/ AM Twilight   7:01:20 AM   6:32:08 AM            
Sunset / PM Twilight   4:15:02 PM   4:44:41 PM            
Length Of Day   9:13:42                          
Special Conditions   Fog                                  
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