Records for Hillsboro Area, Oregon (HIOthr) on 12-19
  Record Highs
  
    - 
      1:  60°F (1994)
    
- 
      2:  59°F (1961)
    
- 
      3:  57°F (1972)
    
 
  Record Lows
  
    - 
      1:  15°F (1964)
    
- 
      2:  16°F (1984)
    
- 
      3:  20°F (1945)
    
 
  Lowest Highs
  
    - 
      1:  51°F (1994)
    
- 
      2:  48°F (1979)
    
- 
      3:  48°F (1972)
    
 
  Highest Lows
  
    - 
      1:  22°F (1964)
    
- 
      2:  30°F (1965)
    
- 
      3:  32°F (2006)
    
 
  Highest December temperature:
  
  64°F on 12-01-1951.
  Lowest December temperature:
  
  -2°F on 12-08-1972.
  Average temperature is 39.2°F
  Average high is 45.6°F
  Average low is 32.9°F
 
  Temperature data from 1929 to 2022.
  Record Precipitation
  
    - 
      1:  2.37" (1941)
    
- 
      2:  1.65" (1932)
    
- 
      3:  1.45" (1953)
    
 
  Precipitation data from 1929 to 2022.