Records for Ontario Area, Oregon (ONOthr) on 05-01
  Record Highs
  
    - 
      1:  89°F (1971)
    
- 
      2:  86°F (1985)
    
- 
      3:  86°F (1981)
    
 
  Record Lows
  
    - 
      1:  25°F (1946)
    
- 
      2:  27°F (2013)
    
- 
      3:  29°F (1988)
    
 
  Lowest Highs
  
    - 
      1:  57°F (2021)
    
- 
      2:  54°F (1981)
    
- 
      3:  53°F (1977)
    
 
  Highest Lows
  
    - 
      1:  53°F (1948)
    
- 
      2:  54°F (1951)
    
- 
      3:  56°F (1988)
    
 
  Highest May temperature:
  
  103°F on 05-29-1986.
  Lowest May temperature:
  
  25°F on 05-01-1946.
  Average temperature is 55.1°F
  Average high is 68.4°F
  Average low is 41.8°F
 
  Temperature data from 1945 to 2022.
  Record Precipitation
  
    - 
      1:  0.80" (1995)
    
- 
      2:  0.58" (1950)
    
- 
      3:  0.29" (1983)
    
 
  Precipitation data from 1945 to 2022.