Grinnell Regional Airport Weather Forecast

    • 16
    • 38

    Becoming Sunny

    • 25
    • 33

    Partly Sunny

    • 33
    • 44

    Mostly Cloudy

    • 31
    • 45

    Mostly Cloudy

    • 39
    • 50

    Mostly Cloudy

    • 34
    • 57

    Partly Sunny

Today 20 Dec Poweshiek

Mostly sunny. Highs in the upper 30s. Northwest Winds 10 to 15 Mph.

Tonight 20 Dec Poweshiek

Mostly clear. Lows around 15. Northwest Winds 5 to 10 Mph.

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Grinnell Regional Airport Temperature Statistics

December Temperature

Newton Municipal Airport - Earl Johnson Field (14.9 miles)

  • Lowest 14 December, 2025

    -9.4 °F

  • Average December

    19.9 °F

  • Highest 9 December, 2025

    46.4 °F

Climate (2020–Present)

Newton Municipal Airport - Earl Johnson Field (14.9 miles)

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  • Average Low 2020–2025

    41.4 °F

  • Average 2020–2025

    51.2 °F

  • Average High 2020–2025

    61.1 °F
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