Records for Ontario Area, Oregon (ONOthr) on 05-30
  Record Highs
  
    - 
      1:  102°F (1972)
    
- 
      2:  101°F (1986)
    
- 
      3:  98°F (2020)
    
 
  Record Lows
  
    - 
      1:  37°F (1988)
    
- 
      2:  37°F (1946)
    
- 
      3:  38°F (2006)
    
 
  Lowest Highs
  
    - 
      1:  65°F (1986)
    
- 
      2:  64°F (2020)
    
- 
      3:  64°F (2002)
    
 
  Highest Lows
  
    - 
      1:  60°F (2022)
    
- 
      2:  63°F (1954)
    
- 
      3:  64°F (1998)
    
 
  Highest May temperature:
  
  103°F on 05-29-1986.
  Lowest May temperature:
  
  25°F on 05-01-1946.
  Average temperature is 64.1°F
  Average high is 77.5°F
  Average low is 50.7°F
 
  Temperature data from 1945 to 2022.
  Record Precipitation
  
    - 
      1:  0.48" (2003)
    
- 
      2:  0.30" (2022)
    
- 
      3:  0.17" (1990)
    
 
  Precipitation data from 1945 to 2022.