TODAY FEB28
TEMPERATURE30
HUMIDITY100
PRESSURE29.92
WIND COND.320 38.9
  • 3621Mon
  • 4930Tue
  • 5430Wed
  • 5529Thu
  • 5028Fri
daynightWeather update from Denison at

Key findings

  • The highest monthly average temperature in Defiance for July is 76 degrees
  • The lowest monthly average temperature in Defiance for January is 22 degrees
  • The most monthly precipitation in Defiance occurs in June with 5.1 inches
  • The air quality index in Defiance is 20% better than the national average
  • The pollution index in Defiance is 90% better than the national average

Compare Defiance, IA Weather

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      Defiance Average Temperature

      In the event that the weather data was unavailable for this city, estimates based upon nearby cities were used.
      MonthTemp. (min)Temp. (max)Temp. (avg)Precipitation
      January13°F33°F22°F0.4"
      February15°F37°F25°F0.7"
      March29°F54°F40°F1.4"
      April39°F66°F51°F3.5"
      May51°F77°F63°F4.0"
      June62°F86°F73°F5.1"
      July65°F89°F76°F3.0"
      August62°F85°F73°F4.9"
      September53°F79°F65°F3.9"
      October41°F67°F52°F2.4"
      November28°F52°F39°F0.9"
      December16°F36°F25°F1.2"

      Defiance air quality index & pollution index

      In the event that the air quality/pollution data was unavailable for this city, estimates based upon nearby cities were used.
      IndexDefianceIowaNational
      Air quality index403950
      Pollution index517,6911,643,8365,066,862

      Defiance air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality283
      Days with moderate air quality82
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Defiance air quality information

      PollutantTotal
      Arsenic0.000%
      Benzene0.010%
      Carbon Tetrachloride0.001%
      Lead0.002%
      Mercury0.000%

      Average monthly Defiance temperature with heat index

      Defiance monthly precipitation with daily maximum

      Defiance monthly snow depth with daily maximum

      Defiance monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Denison, IA8,3263530%
      Arion, IA1264020%
      Earling, IA4434020%
      Harlan, IA5,0084020%
      Dow City, IA4634020%
      Defiance, IA2404020%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      East Shore, CA240468%
      Roy, NM2401570%
      Cuylerville, NY2403726%
      Cherokee Pass, MO240548%
      Garden City, CO2404510%
      Defiance, IA2404020%
      Source: The Defiance, IA weather data displayed above is derived from the NOAA (National Oceanic and Atmospheric). Air quality and pollution data is derived from the EPA (United States Environmental Protection Agency). Air quality and pollution levels measured in a particular area may not be representative of the entire county.