Calmar Weather Forecast

    • 32
    • 41

    Mostly Cloudy

    • 33
    • 44

    Mostly Cloudy

    • 6
    • 38

    Chance Rain/Snow

    • 7
    • 15

    Mostly Sunny

    • 14
    • 28

    Mostly Cloudy

    • 7
    • 23

    Mostly Cloudy

Today 26 Dec Winneshiek

Areas of fog in the morning. Mostly cloudy. Highs in the lower 40s. Northwest Winds 5 to 10 Mph.

Tonight 26 Dec Winneshiek

Mostly cloudy. Lows in the lower 30s. Southwest Winds around 5 Mph, becoming southeast after midnight.

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Calmar Temperature Statistics

December Temperature

Decorah (9.3 miles)

  • Lowest 14 December, 2025

    -9.4 °F

  • Average December

    19 °F

  • Highest 18 December, 2025

    41 °F

Climate (2020–Present)

Decorah (9.3 miles)

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  • Average Low 2020–2025

    39.3 °F

  • Average 2020–2025

    48 °F

  • Average High 2020–2025

    56.5 °F
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