TODAY NOV20
TEMPERATURE57
HUMIDITY51
PRESSURE29.9
WIND COND.130 18.3
  • 5622Thu50%
  • 4124Fri
  • 4426Sat
  • 4829Sun
  • 5033Mon
daynightWeather update from Ottumwa, Ottumwa Industrial Airport at
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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"

Did you know?

  • The highest monthly average temperature in Delta for July is 75 degrees.
  • The lowest monthly average temperature in Delta for January is 24 degrees.
  • The most monthly precipitation in Delta occurs in July with 7.8 inches.
  • The air quality index in Delta is 16% better than the national average.
  • The pollution index in Delta is 86% better than the national average.

Compare Delta, IA Weather To Other Cities

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 index423950
Pollution index684,4641,643,8365,066,862

Delta air quality information

MeasurementTotal
Days measured365
Days with good air quality244
Days with moderate air quality120
Days w/ poor A.Q. for sensitive groups1
Days with unhealthy air quality

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

City, StatePopulationAir Quality IndexNational Avg.
University Park, IA5584118%
Harper, IA964216%
Keswick, IA2414216%
Ollie, IA1894216%
South English, IA2994216%
Delta, IA2464216%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
White Heath, IL2463628%
Hallam, NE2463432%
Jackson Lake, CO2464118%
Wheatland, MO2463922%
Conetoe, NC2463236%
Delta, IA2464216%
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.
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