Portsmouth Rhode Island Weather Almanac  
Wednesday, December 21, 2022  
Clear, Light Winds and Colder  
  Climate Normal Period Climate Record Period
  1991 - 2020 1893 - 2022
    December 21, 2022   Record   Record  
Observed Daily Data   2022   2021   Norm   Depart   Highest   Lowest  
Maximum Temperature   38   42   42   -4   58   in 1999   13   in 1955  
Minimum Temperature   25   33   29   -4   49   in 2018   -3   in 1955  
Average Temperature   32   38   35   -3   53   in 2018   5   in 1955  
 Month Avg Max Temperature   43.8   48.5   44.3   -0.5   53.3   in 2015   31.6   in 1904  
Month Avg Min Temperature   32.6   34.9   31.2   +1.4   40.7   in 2015   16.0   in 1989  
Month Average Temperature   38.5   41.9   37.7   +0.8   47.3   in 2015   24.6   in 1989  
High Heat Index                                      
Low Wind Chill   18   26   16   +2             -25   in 1955  
Heating Degree Days   33   27   29   +4   60   in 1955   12   in 2018  
Month HDD   557   485   572   -15   849   in 1989   371   in 2015  
Season HDD   1378   1279   1562   -184   2137   in 1904   1166   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   29   33   35   -6   57   in 2018   -12   in 1955  
Minimum Dew Point   21   21   19   +2   45   in 2018   -23   in 1955  
Average  Dew Point   25   27   27   -2   51   in 2018   -18   in 1955  
 Month Avg Max Dew Point   37.2   41.7   35.4   +1.8   47.8   in 2015   17.8   in 1989  
Month Avg Min Dew Point   24.6   22.9   20.1   +4.5   35.1   in 2015   -0.4   in 1989  
Month Average Dew Point   31.1   32.5   27.8   +3.4   41.6   in 2015   8.7   in 1989  
Precipitation   .00   .00   .15   -.15   2.05   in 1946            
One Hour   .00   .00           .59   in 1993            
Hourly Rate   .00   .00           4.36   in 2012            
Month Precipitation   3.55   .97   3.16   +.39   9.27   in 1936   .27   in 1998  
Year Precipitation   41.36   46.55   44.59   -3.23   63.81   in 1983   27.14   in 1965  
Snow   0.0   0.0   0.2   -0.2   7.2   in 1954       in    
Snow Depth   0   0           20   in 2009       in    
Month Snow   1.5   0.2   3.8   -2.3   21.3   in 1981   0.0   in 2015  
Season Snow   1.5   0.2   4.4   -2.9   21.3   in 1898   0.0   in 2015  
    December 21, 2022     Record Record
Observed Daily Data   2022   2021   Norm   Depart   Highest Lowest
Maximum Humidity   92%   84%   84%   +8%   100%   in 2018   44%   in 1955  
Minimum Humidity   59%   56%   58%   +1%   96%   in 1972   22%   in 1955  
Average Humidity   76%   70%   71%   +5%   98%   in 1972   33%   in 1955  
Maximum Barometer   30.50   30.18   30.17   +00.33   30.94   in 1983   29.42   in 1978  
Minimum Barometer   30.39   29.86   29.84   +00.55   30.50   in 1983   28.95   in 1973  
Average Barometer   30.45   30.02   30.00   +00.44   30.72   in 1983   29.21   in 1976  
Average Wind   3.1   5.3   8.8   -5.7   18.6   in 1976   2.7   in 1956  
Direction   NNW   W   WNW       WNW SW
High Wind Gust   13   25   27   -14   48   in 1957   12   in 1983  
Direction   NNW   WSW   WNW       S NE
Maximum Water Temp   46.8   45.9   44.9   +1.9   50.2   in 2006   40.6   in 2019  
Minimum Water Temp   43.5   44.2   42.3   +1.2   47.2   in 2011   37.2   in 2004  
Average Water Temp   45.2   45.1   43.6   +1.6   48.4   in 2011   39.1   in 2019  
Sunrise/ AM Twilight   7:08:15 AM   6:38:37 AM            
Sunset / PM Twilight   4:18:10 PM   4:48:03 PM            
Length Of Day   9:09:55                          
Special Conditions   None                              
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