Records for Portland Area, Oregon (PDXthr) on 05-21
  Record Highs
  
    - 
      1:  87°F (1988)
    
 
    - 
      2:  85°F (2001)
    
 
    - 
      3:  85°F (1958)
    
 
  
 
  Record Lows
  
    - 
      1:  38°F (1955)
    
 
    - 
      2:  40°F (1992)
    
 
    - 
      3:  40°F (1971)
    
 
  
 
  Lowest Highs
  
    - 
      1:  58°F (2015)
    
 
    - 
      2:  57°F (1942)
    
 
    - 
      3:  56°F (1958)
    
 
  
 
  Highest Lows
  
    - 
      1:  52°F (1960)
    
 
    - 
      2:  54°F (2010)
    
 
    - 
      3:  55°F (1957)
    
 
  
 
  Highest May temperature:
  
  100°F on 05-28-1983.
  Lowest May temperature:
  
  29°F on 05-01-1954.
  Average temperature is 59.7°F
  Average high is 69.2°F
  Average low is 50.3°F
 
  Temperature data from 1940 to 2022.
  Record Precipitation
  
    - 
      1:  0.74" (2006)
    
 
    - 
      2:  0.49" (2013)
    
 
    - 
      3:  0.44" (1996)
    
 
  
 
  Precipitation data from 1940 to 2022.