Portsmouth Rhode Island Weather Almanac  
Saturday, December 30, 2023  
Cloudy, Dense Fog early, Partly Cloudy Day to Mostly Cloudy PM, Continued Warm  
  Climate Normal Period Climate Record Period
  1991 - 2020 1893 - 2023
    December 30, 2023   Record   Record  
Observed Daily Data   2023   2022   Norm   Depart   Highest   Lowest  
Maximum Temperature   47   55   40   +7   60   in 1984   5   in 1917  
Minimum Temperature   36   39   27   +9   48   in 1948   -10   in 1917  
Average Temperature   42   47   33   +9   52   in 1948   -3   in 1917  
 Month Avg Max Temperature   47.2   42.6   43.3   +3.9   54.1   in 2015   30.3   in 1989  
Month Avg Min Temperature   35.1   29.8   30.1   +5.0   41.5   in 2015   14.3   in 1989  
Month Average Temperature   41.4   36.4   36.7   +4.7   48.1   in 2015   22.5   in 1989  
High Heat Index                   #N/A   in #N/A            
Low Wind Chill   30   37   16   +14             -27   in 1917  
Heating Degree Days   23   18   32   -9   68   in 1917   13   in 1948  
Month Heating DD   708   857   848   -140   1276   in 1989   507   in 2015  
Season Heating DD   1649   1678   1838   -189   2448   in 1904   1302   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   43   45   33   +10   53   in 1984   -3   in 1987  
Minimum Dew Point   30   35   17   +13   42   in 1990   -16   in 1962  
Average  Dew Point   37   40   25   +12   47   in 1990   -7   in 1987  
 Month Avg Max Dew Point   40.9   35.4   34.1   +6.8   49.4   in 2015   15.6   in 1989  
Month Avg Min Dew Point   29.6   21.9   18.5   +11.1   36.1   in 2015   -0.7   in 1989  
Month Average Dew Point   35.6   28.9   26.3   +9.3   43.0   in 2015   7.4   in 1989  
Precipitation   .02   .00   .13   -.11   1.98   in 2019            
One Hour Rain   .02   .00           .39   in 2000            
Half Hour Rain   .01   .00           .20   in 2019            
Hourly Rain Rate   .00   .00           .62   in 2019            
Month Precipitation   5.76   4.66   4.40   +1.36   9.45   in 1936   .58   in 1955  
Year Precipitation   54.81   42.47   45.83   +8.98   65.49   in 1983   27.66   in 1965  
Snow   0.0   0.0   0.3   -0.3   5.8   in 1993            
Snow Depth   0   0   1   -1   15   in 1947            
Month Snow   0.1   1.5   6.2   -6.1   22.3   in 1904   T   in 2011  
Season Snow   0.1   0.1   6.8   +6.8   23.7   in 1904   T   in 1999  
    December 30, 2023     Record Record
Observed Daily Data   2023   2022   Norm   Depart   Highest Lowest
Maximum Humidity   99%   96%   86%   +13%   100%   in 2005   38%   in 1949  
Minimum Humidity   78%   52%   53%   +25%   96%   in 1992   16%   in 1994  
Average Humidity   89%   74%   69%   +19%   98%   in 1992   30%   in 1994  
Maximum Barometer   29.75   30.30   30.15   -00.40   30.68   in 2006   29.33   in 1997  
Minimum Barometer   29.50   30.20   29.81   -00.31   30.40   in 1972   28.89   in 1997  
Average Barometer   29.63   30.25   29.98   -00.35   30.50   in 1978   29.11   in 1997  
Average Wind   6.3   6.1   8.5   -2.2   25.7   in 1962   2.2   in 2004  
Direction   W   SSW   NW       NW N
High Wind Gust   23   20   26   -3   70   in 1962   11   in 2021  
Direction   WNW   SSW   WNW       NW NNW
Maximum Water Temp   47.8   43.5   43.5   +4.3   48.9   in 2006   37.8   in 2017  
Minimum Water Temp   46.6   41.9   41.0   +5.6   46.6   in 2023   33.6   in 2017  
Average Water Temp   47.2   42.7   42.3   +4.9   47.4   in 2021   35.7   in 2017  
Sunrise/ AM Twilight   7:11:21 AM   6:41:48 AM            
Sunset / PM Twilight   4:23:49 PM   4:53:50 PM            
Length Of Day   9:12:28                          
Special Conditions   Dense Fog                              
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