Portsmouth Rhode Island Weather Almanac  
Wednesday, January 1, 2025  
Cloudy, Moderate Rain & Fog early, Partly Cloudy Day to Cloudy/Light Rain PM, Windy, Continued Warm  
  Climate Normal Period Climate Record Period
  1991 - 2020 1893 - 2025
    January 1, 2025   Record   Record  
Observed Daily Data   2025   2024   Norm   Depart   Highest   Lowest  
Maximum Temperature   51   43   40   +11   59   in 1966   12   in 1918  
Minimum Temperature   38   29   27   +11   48   in 2022   -2   in 1918  
Average Temperature   45   36   34   +11   51   in 2022   5   in 1918  
 Month Avg Max Temperature   51.0   43.0   40.0   +11.0   59.0   in 1966   12.0   in 1918  
Month Avg Min Temperature   29.0   29.0   27.0   +2.0   48.0   in 2022   -2.0   in 1918  
Month Average Temperature   40.0   36.0   34.0   +11.0   51.0   in 2022   5.0   in 1918  
High Heat Index   76               76   in 2024            
Low Wind Chill   31   24   15   +16             -16   in 2018  
Heating Degree Days   20   29   31   -11   60   in 1918   14   in 2022  
Month Heating DD   20   29   32   -12   60   in 1918   14   in 2022  
Season Heating DD   1672   1709   1902   -230   2507   in 1918   1349   in 2016    
Cooling Degree Days   0   0   #REF!   #REF!   0   in 1900   0   in All    
Month Cooling DD                                        
Year Cooling DD                                        
Maximum Dew Point   51   32   33   +18   54   in 2019   -1   in 2018    
Minimum Dew Point   33   26   17   +16   48   in 2022   -13   in 1999    
Average  Dew Point   42   29   25   +17   51   in 2022   -4   in 2018  
 Month Avg Max Dew Point   51.0   32.0   33.0   +18.0   54.0   in 2019   -1.0   in 2018  
Month Avg Min Dew Point   33.0   26.0   17.0   +16.0   48.0   in 2022   -13.0   in 1999  
Month Average Dew Point   42.0   29.0   25.0   +17.0   51.0   in 2022   -4.0   in 2018  
Precipitation   .42   .00   .12   +.30   1.56   in 2007            
One Hour Rain   .18   .00           .39   in 1995            
Half Hour Rain   .11   .00         .18   in 2019            
Hourly Rain Rate   1.02   .00           1.09   in 2007            
Month Precipitation   .42   .00   .12   +.30   1.56   in 2007   .00   in 2024  
Year Precipitation   .42   .00   .12   +.30   1.56   in 2007   .00   in 2024    
Snow   0.0   0.0   0.3   -0.3   6.2   in 1938   0.0   in      
Snow Depth   0   0   0.9   -1   13   in 1948   0   in      
Month Snow   0.0   0.0   0.3   -0.3   6.2   in 1938   0.0   in 2025    
Season Snow   0.2   0.1   7.4   -7.2   24.0   in 1899   T   in 2000    
    January 1, 2025     Record Record  
Observed Daily Data   2025   2024   Norm   Depart   Highest Lowest  
Maximum Humidity   99%   92%   86%   +13%   100%   in 2022   55%   in 1965    
Minimum Humidity   78%   63%   55%   +23%   99%   in 2022   23%   in 1992    
Average Humidity   89%   78%   70%   +18%   100%   in 2022   44%   in 1965    
Maximum Barometer   29.62   30.05   30.17   -00.55   30.87   in 1947   29.62   in 2025  
Minimum Barometer   29.42   29.97   29.81   -00.39   30.45   in 1984   29.08   in 1949  
Average Barometer   29.52   30.01   29.99   -00.47   30.52   in 1991   29.43   in 1977  
Average Wind   9.5   4.6   8.2   +1.3   20.5   in 1969   1.6   in 1981  
Direction   W   NW   NW       WNW         N        
High Wind Gust   32   15   27   +5   52   in 1969   10   in 1981  
Direction   WNW   NW   WNW       WNW         N        
Maximum Water Temp   46.4   46.8   42.9   +3.5   50.4   in 2007   36.0   in 2018  
Minimum Water Temp   45.7   45.0   40.5   +5.2   47.8   in 2007   32.4   in 2013  
Average Water Temp   46.1   45.9   41.8   +4.3   49.1   in 2007   34.3   in 2018  
Sunrise/ AM Twilight   7:11:44 AM   6:40:28 AM            
Sunset / PM Twilight   4:25:39 PM   4:57:20 PM            
Length Of Day   16:26:05                          
Special Conditions   Fog                                  
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