Records for Hillsboro Area, Oregon (HIOthr) on 04-21
  Record Highs
  
    - 
      1:  85°F (1934)
    
- 
      2:  81°F (2009)
    
- 
      3:  78°F (1986)
    
 
  Record Lows
  
    - 
      1:  27°F (1951)
    
- 
      2:  28°F (1968)
    
- 
      3:  28°F (1950)
    
 
  Lowest Highs
  
    - 
      1:  55°F (1930)
    
- 
      2:  53°F (1998)
    
- 
      3:  51°F (1956)
    
 
  Highest Lows
  
    - 
      1:  46°F (2008)
    
- 
      2:  47°F (1960)
    
- 
      3:  50°F (1985)
    
 
  Highest April temperature:
  
  90°F on 04-29-1957.
  Lowest April temperature:
  
  20°F on 04-16-1933.
  Average temperature is 50.9°F
  Average high is 62.2°F
  Average low is 39.6°F
 
  Temperature data from 1929 to 2022.
  Record Precipitation
  
    - 
      1:  0.82" (1961)
    
- 
      2:  0.44" (1996)
    
- 
      3:  0.38" (1993)
    
 
  Precipitation data from 1929 to 2022.