Portsmouth Rhode Island Weather Almanac  
Tuesday, June 15, 2021  
Cloudy, Light Rain & Fog early, Partly Cloudy Day to Clear PM, Light Winds & Warmer  
Climate Normal Period Climate Record Period  
1991- 2020   1893 - 2021  
    June 15, 2021   Record   Record  
Observed Daily Data   2021   2020   Norm   Depart   Highest   Lowest  
Maximum Temperature   78   71   74   +4   92   in 1956   55   in 1951  
Minimum Temperature   61   54   58   +3   68   in 1969   44   in 1911  
Average Temperature   70   63   66   +4   78   in 1956   53   in 1951  
 Month Avg Max Temperature   76.3   73.7   71.5   +4.7   78.9   in 1925   61.5   in 1907  
Month Avg Min Temperature   58.1   55.8   55.3   +2.8   59.8   in 1899   47.5   in 1907  
Month Average Temperature   67.5   65.1   63.5   +4.0   69.3   in 1925   54.6   in 1907  
HDD   0   2   1   -1   12   in 1951   0   in 2021  
Month HDD   15   27   38   -23   156   in 1907   2   in 1899  
Season HDD   5060   5120   5466   -406   6601   in 1905   4532   in 2012  
CDD   5   0   3   +2   13   in 1956   0   in    
Month CDD   53   28   22   +31   81   in 1984   0   in 1998  
Year CDD   70   36   33   +34   81   in 1991   0   in 1972  
Maximum Dew Point   68   57   63   +5   75   in 1994   42   in 1978  
Minimum Dew Point   60   47   53   +7   65   in 1969   34   in 1978  
Average  Dew Point   64   52   58   +6   70   in 1994   38   in 1978  
 Month Avg Max Dew Point   65.5   60.5   60.6   +4.9   65.9   in 1996   50.6   in 1988  
Month Avg Min Dew Point   54.6   50.8   50.7   +3.9   55.7   in 2005   42.3   in 1988  
Month Average Dew Point   60.0   55.5   55.5   +4.5   60.4   in 1996   46.5   in 1988  
Precipitation   .02   .00   .12   -.10   1.28   in 1896            
One Hour   .02   .00           .46   in 1983            
Hourly Rate   .08   .00           1.12   in 2008            
Month Precipitation   .58   1.16   1.77   -1.19   8.45   in 1998   T   in 1949  
Year Precipitation   17.58   20.37   20.81   -3.23   37.97   in 1998   12.64   in 1957  
Snow   0.0   0.0   #####   #####   0.0   in              
Snow Depth   0   0           43997   in              
Month Snow   #N/A   #N/A   #N/A   #N/A   #N/A   in #N/A   #N/A   in    
Season Snow   27.7   12.9   33.5   -5.8   84.1   in 1996   5.0   in 1998  
    June 15, 2021     Record Record
Observed Daily Data   2021   2020   Norm   Depart   Highest Lowest
Maximum Humidity   99%   91%   90%   +9%   100%   in 2003   55%   in 1978  
Minimum Humidity   70%   47%   56%   +14%   89%   in 1989   29%   in 1988  
Average Humidity   85%   69%   73%   +11%   95%   in 1989   43%   in 1978  
Maximum Barometer   29.81   30.43   30.03   -00.22   30.43   in 2020   29.61   in 1959  
Minimum Barometer   29.67   30.36   29.83   -00.16   30.36   in 2020   29.36   in 1958  
Average Barometer   29.74   30.40   29.93   -00.19   30.40   in 2020   29.52   in 1958  
Average Wind   4.0   5.8   6.3   -2.3   13.1   in 1969   1.2   in 1996  
Direction   SSE   NE   SW       SW         SW        
High Wind Gust   19   23   21   -2   34   in 1959   12   in 2018  
Direction   SSE   NNE   SW       W         NW        
High Heat Index   80   69   73   +7   94   in 1956            
Low Wind Chill                             44   in 1911  
Maximum Water Temp   65.1   58.5   63.4   +1.7   68.4   in 2007   58.5   in 2020  
Minimum Water Temp   61.5   56.3   60.0   +1.5   65.3   in 2007   55.4   in 2006  
Average Water Temp   63.3   57.4   61.7   +1.6   66.8   in 2007   57.4   in 2020  
Sunrise/ AM Twilight   5:10:49 AM   4:36:54 AM            
Sunset / PM Twilight   8:21:09 PM   8:55:05 PM            
Length Of Day   15:10:20                          
Special Conditions   Dense Fog                              
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