Portsmouth Rhode Island Weather Almanac  
Sunday, December 31, 2023  
Cloudy and Cooler  
  Climate Normal Period Climate Record Period
  1991 - 2020 1893 - 2023
    December 31, 2023   Record   Record  
Observed Daily Data   2023   2022   Norm   Depart   Highest   Lowest  
Maximum Temperature   39   56   40   -1   57   in 1936   9   in 1962  
Minimum Temperature   34   44   27   +7   44   in 2022   -5   in 1917  
Average Temperature   37   50   33   +4   50   in 2022   3   in 1962  
 Month Avg Max Temperature   46.9   43.0   43.2   +3.7   54.0   in 2015   30.8   in 1989  
Month Avg Min Temperature   35.1   30.3   30.0   +5.0   41.4   in 2015   14.6   in 1989  
Month Average Temperature   41.3   36.9   36.5   +4.7   48.0   in 2015   22.9   in 1989  
High Heat Index                   #N/A   in #N/A            
Low Wind Chill   28   42   14   +14             -26   in 1962  
Heating Degree Days   28   15   32   -4   62   in 1962   15   in 2022  
Month Heating DD   736   872   880   -144   1304   in 1989   527   in 2015  
Season Heating DD   1677   1693   1870   -193   2476   in 1904   1322   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   31   55   33   -2   55   in 2022   -5   in 1962  
Minimum Dew Point   26   44   17   +9   44   in 2022   -18   in 1962  
Average  Dew Point   29   50   25   +4   50   in 2022   -12   in 1962  
 Month Avg Max Dew Point   40.6   36.0   33.9   +6.6   49.3   in 2015   16.6   in 1989  
Month Avg Min Dew Point   29.5   22.6   18.4   +11.1   35.9   in 2015   0.1   in 1989  
Month Average Dew Point   35.4   29.5   26.2   +9.2   42.8   in 2015   8.3   in 1989  
Precipitation   .00   .58   .13   -.13   1.37   in 1906            
One Hour Rain   .00   .10           .18   in 1989            
Half Hour Rain   .00   .06           .10   in 2007            
Hourly Rain Rate   .00   .22           .64   in 2018            
Month Precipitation   5.76   5.24   4.53   +1.23   9.94   in 1936   .58   in 1955  
Year Precipitation   54.81   43.05   45.96   +8.85   65.49   in 1983   27.66   in 1965  
Snow   0.0   0.0   0.3   -0.3   5.1   in 2008            
Snow Depth   0   0   1   -1   15   in 1947            
Month Snow   0.1   1.5   6.5   -6.4   23.5   in 2009   T   in 2011  
Season Snow   0.1   0.1   7.1   +7.1   23.7   in 1904   T   in 1999  
    December 31, 2023     Record Record
Observed Daily Data   2023   2022   Norm   Depart   Highest Lowest
Maximum Humidity   82%   99%   85%   -3%   100%   in 2021   57%   in 1955  
Minimum Humidity   67%   95%   55%   +12%   97%   in 2021   22%   in 1991  
Average Humidity   75%   97%   70%   +4%   99%   in 2021   41%   in 1991  
Maximum Barometer   29.98   30.20   30.18   -00.20   30.76   in 1991   29.59   in 1976  
Minimum Barometer   29.75   29.72   29.88   -00.13   30.59   in 1963   28.94   in 1948  
Average Barometer   29.87   29.96   30.03   -00.16   30.67   in 1963   29.47   in 1962  
Average Wind   7.1   5.2   7.5   -0.4   23.9   in 1962   1.3   in 1963  
Direction   WNW   SSW   WNW       NW NW
High Wind Gust   23   17   24   -1   57   in 1901   10   in 1967  
Direction   #N/A   #N/A   WNW       NW NW
Maximum Water Temp   46.9   44.2   43.3   +3.7   49.2   in 2011   38.1   in 2000  
Minimum Water Temp   45.5   43.0   40.9   +4.6   47.4   in 2015   36.5   in 2017  
Average Water Temp   46.2   43.6   42.1   +4.1   47.7   in 2021   36.5   in 2017  
Sunrise/ AM Twilight   7:11:31 AM   6:42:00 AM            
Sunset / PM Twilight   4:24:37 PM   4:54:38 PM            
Length Of Day   9:13:06                          
Special Conditions   None                              
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