TODAY MAY15
TEMPERATURE73
HUMIDITY36
PRESSURE29.99
WIND COND.170 11.2
  • 7352Sun20%30%
  • 7455Mon20%20%
  • 7359Tue20%30%
  • 7761Wed40%70%
  • 7962Thu60%70%
daynightWeather update from Forest City Municipal Airport at

Key findings

  • The highest monthly average temperature in Duncan for July is 72.5 degrees
  • The lowest monthly average temperature in Duncan for January is 16.7 degrees
  • The most monthly precipitation in Duncan occurs in June with 5.4 inches
  • The air quality index in Duncan is 70% better than the national average
  • The pollution index in Duncan is 85% better than the national average

Compare Duncan, IA Weather

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      Duncan 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
      January9°F25°F17°F0.7"
      February11°F29°F20°F1.1"
      March25°F44°F34°F2.2"
      April36°F60°F47°F5.1"
      May48°F71°F59°F5.0"
      June58°F81°F69°F5.4"
      July61°F84°F72°F4.2"
      August59°F82°F70°F4.0"
      September51°F76°F62°F4.3"
      October38°F62°F49°F2.7"
      November26°F47°F36°F1.5"
      December13°F29°F21°F1.4"

      Duncan 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.
      IndexDuncanIowaNational
      Air quality index153950
      Pollution index784,9241,643,8365,066,862

      Duncan air quality information

      MeasurementTotal
      Days measured118
      Days with good air quality118
      Days with moderate air quality0
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Duncan air quality information

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

      Average monthly Duncan temperature with heat index

      Duncan monthly precipitation with daily maximum

      Duncan monthly snow depth with daily maximum

      Duncan monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Crystal Lake, IA2021570%
      Goodell, IA1281570%
      Meservey, IA1771570%
      Wesley, IA3331570%
      Fertile, IA3461570%
      Duncan, IA961570%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Millerton, IA963922%
      Andover, SD962060%
      Pioneer, LA963432%
      Crows Nest, IN96548%
      Varina, IA963530%
      Duncan, IA961570%
      Source: The Duncan, 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.