Portsmouth Rhode Island Weather Almanac
Monday, May 10, 2021
Cloudy, Heavy Rain & Fog early, Partly Cloudy PM, Light Winds & Continued Cool
Climate Normal Period Climate Record Period  
1991- 2020   1893 - 2021  
    May 10, 2021     Record Record
Observed Daily Data   2021   2020   Norm   Depart   Highest Lowest
Maximum Temperature   58   59   63   -5   89   in 1896   45   in 1924  
Minimum Temperature   45   35   47   -2   59   in 1979   34   in 1977  
Average Temperature   52   47   55   -3   71   in 1979   42   in 1977  
 Month Avg Max Temperature   61.4   61.6   61.5   -0.1   73.3   in 1930   50.8   in 1917  
Month Avg Min Temperature   45.6   43.6   45.5   +0.1   52.0   in 1930   38.7   in 1917  
Month Average Temperature   53.8   52.8   53.6   +0.2   62.9   in 1930   45.0   in 1917  
HDD   13   18   10   +3   23   in 1977   0   in 1979  
Month HDD   112   122   114   -2   200   in 1917   33   in 1930  
Season HDD   4921   4943   5287   -366   6351   in 1905   4408   in 2012  
CDD   0   0   0   +0   6   in 1979   0   in    
Month CDD   0   0   0   +0   19   in 2001   0   in 2021  
Year CDD   0   0   0   +0   19   in 2001   0   in 2021  
Maximum Dew Point   50   43   51   -1   63   in 2015   26   in 1962  
Minimum Dew Point   44   26   40   +4   55   in 2015   12   in 1962  
Average  Dew Point   47   35   45   +2   59   in 2015   19   in 1962  
 Month Avg Max Dew Point   49.2   46.8   49.6   -0.4   56.9   in 1998   36.5   in 1952  
Month Avg Min Dew Point   38.4   31.8   38.0   +0.4   49.0   in 1998   25.3   in 1968  
Month Average Dew Point   43.9   39.5   43.8   +0.1   53.0   in 1998   32.1   in 1968  
Precipitation   .97   .00   .11   +.86   .97   in 2021            
One Hour   .24   .00           .32   in 1990            
Hourly Rate   1.23   .00           1.23   in 2021            
Month Precipitation   2.36   1.46   1.17   +1.19   4.26   in 1972   .00   in 2015  
Year Precipitation   14.06   17.66   16.90   -2.84   31.60   in 1983   10.05   in 1927  
Snow   0.0   0.0   0.0   +0.0   T   in 1977            
Snow Depth   0   0           2   in 1977            
Month Snow   0.0   0.0   0.0   +0.0   1.7   in 1977   0.0   in    
Season Snow   27.7   12.9   33.5   -5.8   84.1   in 1996   5.0   in 1998  
    May 10, 2021     Record Record
Observed Daily Data   2021   2020   Norm   Depart   Highest Lowest
Maximum Humidity   97%   82%   88%   +9%   100%   in 2015   43%   in 1962  
Minimum Humidity   62%   36%   52%   +10%   95%   in 1998   14%   in 1962  
Average Humidity   80%   59%   70%   +10%   98%   in 1998   29%   in 1962  
Maximum Barometer   29.95   30.02   30.02   -00.07   30.37   in 1996   29.59   in 1964  
Minimum Barometer   29.75   29.93   29.78   -00.03   30.14   in 1993   29.20   in 1945  
Average Barometer   29.85   29.98   29.90   -00.05   30.22   in 1993   29.50   in 1969  
Average Wind   4.3   10.6   8.0   -3.7   15.6   in 1956   2.3   in 1994  
Direction   NNE   W   SSW       SSW         SW        
High Wind Gust   15   29   26   -11   44   in 1964   13   in 1953  
Direction   NNE   SSW   SW       WNW         SW        
High Heat Index                   82   in 1979            
Wind Chill       27                     27   in 2020  
Maximum Water Temp   52.3   44.2   53.3   -1.0   60.3   in 2007   44.2   in 2020  
Minimum Water Temp   49.8   42.1   49.9   -0.1   54.1   in 2013   42.1   in 2020  
Average Water Temp   51.1   43.2   51.6   -0.5   57.1   in 2007   43.2   in 2020  
Sunrise/ AM Twilight   5:29:56 AM   4:58:49 AM            
Sunset / PM Twilight   7:53:19 PM   8:24:26 PM            
Length Of Day   14:23:23                          
Special Conditions   None Fog                                
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