TODAY DEC10
TEMPERATURE14
HUMIDITY94
PRESSURE30.28
WIND COND.
  • 3827Tue
  • 3525Wed30%
  • 3524Thu
  • 3724Fri
  • 3927Sat
daynightWeather update from Grinnell Municipal Airfield at

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Grinnell 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
January14°F30°F21°F1.4"
February17°F33°F24°F2.7"
March31°F50°F39°F3.7"
April40°F63°F50°F7.2"
May52°F74°F62°F7.7"
June62°F82°F72°F7.8"
July65°F85°F74°F7.6"
August63°F82°F72°F7.4"
September54°F77°F64°F7.1"
October43°F64°F53°F6.9"
November32°F50°F40°F3.7"
December20°F35°F27°F5.3"

Did you know?

  • The highest monthly average temperature in Grinnell for July is 74 degrees.
  • The lowest monthly average temperature in Grinnell for January is 21 degrees.
  • The most monthly precipitation in Grinnell occurs in June with 7.8 inches.
  • The air quality index in Grinnell is 17% better than the national average.
  • The pollution index in Grinnell is 86% better than the national average.

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Compare Grinnell, IA Weather To Other Cities

Grinnell 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.
IndexGrinnellIowaNational
Air quality index413950
Pollution index684,4641,643,8365,066,862

Grinnell air quality information

MeasurementTotal
Days measured365
Days with good air quality267
Days with moderate air quality98
Days w/ poor A.Q. for sensitive groups
Days with unhealthy air quality

Grinnell air quality information

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

Average monthly Grinnell temperature with heat index

Grinnell monthly precipitation with daily maximum

Grinnell monthly snow depth with daily maximum

Grinnell monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
Haverhill, IA1693726%
Ferguson, IA1373726%
Gilman, IA5983726%
Laurel, IA3583726%
Lynnville, IA4564118%
Grinnell, IA9,1124118%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Rawlins, WY9,1143922%
Frankfort Square, IL9,1166020%
Rock Falls, IL9,104536%
Stuttgart, AR9,125476%
Audubon, PA9,1255714%
Grinnell, IA9,1124118%
Source: The Grinnell, 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.