TODAY MAR28
TEMPERATURE29
HUMIDITY75
PRESSURE101930
WIND COND.80 11.2
  • 6742Fri30%
  • 6039Sat
  • 5943Sun60%70%
  • 5736Mon80%60%
  • 5232Tue30%
daynightWeather update from Ottumwa Regional Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Delta for July is 75 degrees
  • The lowest monthly average temperature in Delta for January is 24.4 degrees
  • The most monthly precipitation in Delta occurs in July with 7.8 inches
  • The air quality index in Delta is 17% better than the national average
  • The pollution index in Delta is 75% better than the national average

Compare Delta, IA Weather

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      Delta 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
      January17°F34°F24°F1.9"
      February17°F34°F25°F2.4"
      March31°F52°F40°F3.0"
      April41°F65°F52°F4.3"
      May53°F75°F63°F6.0"
      June62°F84°F72°F4.4"
      July65°F86°F75°F7.8"
      August63°F83°F72°F4.4"
      September54°F78°F65°F5.3"
      October44°F66°F53°F5.8"
      November32°F52°F41°F3.9"
      December21°F37°F28°F4.0"

      Delta 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.
      IndexDeltaIowaNational
      Air quality index353942
      Pollution index684,4641,154,5352,726,193

      Delta air quality information

      MeasurementTotal
      Days measured364
      Days with good air quality278
      Days with moderate air quality86
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Delta air quality information

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

      Average monthly Delta temperature with heat index

      Delta monthly precipitation with daily maximum

      Delta monthly snow depth with daily maximum

      Delta monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Kirkville, IA2513530.0%
      Gibson, IA303530.0%
      Sigourney, IA1,9093530.0%
      Packwood, IA5863530.0%
      Webster, IA1703530.0%
      Delta, IA3383530.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Northway, AK3383824.0%
      Tununak, AK3383138.0%
      St. Charles, AR3384314.0%
      Strawberry, AR3384510.0%
      Winkelman, AZ338476.0%
      Delta, IA3383530.0%
      Source: The Delta, 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.