TODAY SEP20
TEMPERATURE86
HUMIDITY55
PRESSURE29.72
WIND COND.180 13.9
  • 6241Fri
  • 6949Sat
  • 7656Sun
  • 7652Mon40%
  • 6746Tue30%
daynightWeather update from Denison at
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Denison 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°F29°F20°F0.2"
February14°F31°F22°F2.0"
March29°F47°F36°F0.7"
April39°F61°F49°F3.9"
May50°F73°F61°F5.8"
June61°F82°F71°F2.9"
July64°F85°F74°F2.8"
August62°F81°F70°F2.6"
September54°F76°F64°F2.7"
October42°F62°F51°F1.9"
November29°F49°F37°F0.9"
December17°F32°F24°F3.5"

Did you know?

  • The highest monthly average temperature in Denison for July is 74 degrees.
  • The lowest monthly average temperature in Denison for January is 20 degrees.
  • The most monthly precipitation in Denison occurs in May with 5.8 inches.
  • The air quality index in Denison is 17% better than the national average.
  • The pollution index in Denison is 89% better than the national average.

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Denison 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.
IndexDenisonIowaNational
Air quality index413950
Pollution index517,6911,643,8365,066,862

Denison air quality information

MeasurementTotal
Days measured365
Days with good air quality254
Days with moderate air quality110
Days w/ poor A.Q. for sensitive groups1
Days with unhealthy air quality

Denison air quality information

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

Average monthly Denison temperature with heat index

Denison monthly precipitation with daily maximum

Denison monthly snow depth with daily maximum

Denison monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
Westside, IA3294118%
Charter Oak, IA5964118%
Ricketts, IA1244118%
Kiron, IA2624118%
Schleswig, IA8064118%
Denison, IA8,3264118%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Gulf Hills, MS8,3263824%
Jefferson City, TN8,3243922%
Helotes, TX8,3294510%
Roxboro, NC8,3293530%
Edgemere, MD8,322468%
Denison, IA8,3264118%
Source: The Denison, 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.