Records for Dubuque Area, Iowa (DBQthr) on 09-21
  Record Highs
  
    - 
      1:  94°F (1891)
    
- 
      2:  91°F (1895)
    
- 
      3:  90°F (1908)
    
 
  Record Lows
  
    - 
      1:  35°F (1991)
    
- 
      2:  35°F (1952)
    
- 
      3:  37°F (1983)
    
 
  Lowest Highs
  
    - 
      1:  72°F (1895)
    
- 
      2:  70°F (2019)
    
- 
      3:  68°F (1941)
    
 
  Highest Lows
  
    - 
      1:  48°F (1913)
    
- 
      2:  49°F (1995)
    
- 
      3:  51°F (1983)
    
 
  Highest September temperature:
  
  99°F on 09-06-1922.
  Lowest September temperature:
  
  24°F on 09-30-1899.
  Average temperature is 62.6°F
  Average high is 73.2°F
  Average low is 51.9°F
 
  Temperature data from 1874 to 2022.
  Record Precipitation
  
    - 
      1:  2.40" (1965)
    
- 
      2:  1.80" (1986)
    
- 
      3:  1.50" (1950)
    
 
  Precipitation data from 1873 to 2022.