Portsmouth Rhode Island Weather Almanac  
Sunday, December 18, 2022  
Cloudy early then Partly Cloudy, Breezy and Cooler  
  Climate Normal Period Climate Record Period
  1991 - 2020 1893 - 2022
    December 18, 2022   Record   Record  
Observed Daily Data   2022   2021   Norm   Depart   Highest   Lowest  
Maximum Temperature   41   43   43   -2   60   in 1984   11   in 1919  
Minimum Temperature   32   37   29   +3   47   in 1996   -3   in 1919  
Average Temperature   37   40   36   +1   50   in 2012   4   in 1919  
 Month Avg Max Temperature   44.5   50.1   44.7   -0.2   54.6   in 2015   30.7   in 1904  
Month Avg Min Temperature   33.4   36.4   31.6   +1.8   41.8   in 2015   16.4   in 1989  
Month Average Temperature   39.2   43.4   38.0   +1.2   48.5   in 2015   25.1   in 1904  
High Heat Index                                      
Low Wind Chill   22   33   15   +7             -15   in 1919  
Heating Degree Days   28   25   29   -1   61   in 1919   15   in 2012  
Month HDD   464   388   485   -21   719   in 1904   297   in 2015  
Season HDD   1285   1182   1475   -190   2031   in 1904   1092   in 2015  
Cooling Degree Days   0   0   #REF!   #REF!   0   in 2022   0   in    
Month CDD                                 in    
Year CDD   777   795   609   +168   871   in 2020   290   in 1902  
Maximum Dew Point   30   41   35   -5   54   in 2016   4   in 2009  
Minimum Dew Point   23   25   20   +3   47   in 1996   -10   in 1979  
Average  Dew Point   27   33   28   -1   50   in 1996   -1   in 1979  
 Month Avg Max Dew Point   38.8   42.9   35.9   +3.0   49.3   in 2015   18.1   in 1989  
Month Avg Min Dew Point   25.2   24.0   20.7   +4.4   37.4   in 2015   -0.4   in 1989  
Month Average Dew Point   32.3   33.7   28.3   +4.0   43.6   in 2015   8.8   in 1989  
Precipitation   .00   .16   .15   -.15   1.46   in 1954            
One Hour   .00   .03           .44   in 1954            
Hourly Rate   .00   .05           .57   in 2012            
Month Precipitation   3.55   .87   2.71   +.84   7.74   in 1936   .27   in 1998  
Year Precipitation   41.36   46.45   44.14   -2.78   63.81   in 1983   27.14   in 1965  
Snow   0.0   0.0   0.2   -0.2   6.6   in 1904       in    
Snow Depth   0   0           12   in 1904       in    
Month Snow   1.5   0.2   3.2   -1.7   21.3   in 1981   0.0   in 2015  
Season Snow   1.5   0.2   3.8   -2.3   21.3   in 1981   0.0   in 2015  
    December 18, 2022     Record Record
Observed Daily Data   2022   2021   Norm   Depart   Highest Lowest
Maximum Humidity   84%   98%   85%   -1%   100%   in 2017   51%   in 1978  
Minimum Humidity   52%   51%   54%   -2%   96%   in 1996   26%   in 2002  
Average Humidity   68%   75%   69%   -1%   98%   in 1996   43%   in 1978  
Maximum Barometer   29.96   30.20   30.14   -00.18   30.59   in 1957   29.59   in 2001  
Minimum Barometer   29.76   29.76   29.79   -00.03   30.38   in 1957   29.14   in 2001  
Average Barometer   29.86   29.98   29.97   -00.11   30.49   in 1957   29.37   in 2001  
Average Wind   9.4   4.6   8.6   +0.8   20.4   in 2018   1.5   in 1967  
Direction   WNW   NE   WNW       NW ESE
High Wind Gust   23   15   27   -4   52   in 1956   9   in 1967  
Direction   NW   NNE   WNW       WNW ESE
Maximum Water Temp   46.9   49.5   45.7   +1.2   51.5   in 2011   39.9   in 2007  
Minimum Water Temp   45.3   47.8   43.4   +1.9   50.2   in 2015   37.5   in 2007  
Average Water Temp   46.1   48.7   44.6   +1.5   50.4   in 2015   38.7   in 2007  
Sunrise/ AM Twilight   7:06:34 AM   6:36:58 AM            
Sunset / PM Twilight   4:16:50 PM   4:46:41 PM            
Length Of Day   9:10:16                          
Special Conditions   None                              
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