Best year time to visit Grinnell

General weather information about Grinnell

Average annual temperature is 12.1 °C

Absolute maximum temperature: 37.9 °C

Absolute minimum temperature: -22.4 °C

Number of sunny days: 226 days

Number of rainy days: 115 days

Number of snow days: 24 days

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* Weather data for Grinnell United States is based on climate observations for 2026 year

Grinnell air temperature forecast for each month

JanFebMarAprMayJunJulAugSepOctNovDec
Absolute maximum temperature (°C)12.519.422.628.628.331.737.936.636.329.922.217.4
Average daytime temperature (°C)2.88.011.019.123.427.131.331.429.120.314.48.3
Average temperature (°C)-2.5-0.43.411.017.221.224.624.722.013.47.02.5
Average night temperature (°C)-5.9-5.6-2.14.712.015.818.719.015.97.61.7-1.5
Absolute minimum temperature (°C)-22.4-17.7-7.7-4.53.312.312.112.59.7-7.1-6.5-5.2

Grinnell monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)10.011.012.013.014.014.014.014.013.011.010.09.0
Daylight mean duration (h)9.810.712.013.214.314.914.613.712.411.210.19.5
Daylight minimum duration (h)9.010.011.012.013.014.014.013.011.010.09.09.0
Sunshine mean duration (h)6.88.48.810.810.011.512.311.710.69.57.75.6
Precipitation (mm)39251723147100106781022729
Sunny days201822221012141821252519
Rainy days3368211817139539
Snow days873000000123

Grinnell - weather forecast by months

Grinnell weather in januaryGrinnell weather in februaryGrinnell weather in marchGrinnell weather in aprilGrinnell weather in mayGrinnell weather in juneGrinnell weather in julyGrinnell weather in augustGrinnell weather in septemberGrinnell weather in octoberGrinnell weather in novemberGrinnell weather in december

Best time to visit Grinnell:

The best time to visit Grinnell during the most sunny months:

  • July — 12.3(h)

The largest precipitation sum in Grinnell is at

  • May — 147(mm)
  • June — 100(mm)
  • July — 106(mm)
  • August — 78(mm)

    • Weather forecast in the closest to Grinnell admin centers

    Weather forecast in the closest towns to Grinnell

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    Frequently asked questions

    When is the best time to visit Grinnell?
    The historical weather data above shows the warmest, sunniest and driest months to help you choose the best time to visit Grinnell.
    What is the weather like in Grinnell?
    See average temperature, rainfall and daylight hours for Grinnell by month in the table above.
    How many sunny days does Grinnell have?
    The monthly weather statistics above show sunshine and rainfall patterns for Grinnell throughout the year.