Castalia Weather Forecast

    • 20
    • 23

    Mostly Cloudy

    • -9
    • 24

    Mostly Cloudy

    • -2
    • 7

    Cold

    • 12
    • 25

    Mostly Cloudy

    • 7
    • 23

    Chance Snow

    • 0
    • 16

    Mostly Cloudy

Today 2 Dec Winneshiek

Areas of freezing fog in the morning. Partly sunny. Highs in the mid 20s. Southwest Winds 5 to 10 Mph.

Tonight 2 Dec Winneshiek

Mostly cloudy. Lows around 11. Southwest Winds around 5 Mph.

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Castalia Temperature Statistics

December Temperature

Decorah (11.8 miles)

  • Lowest

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  • Average December

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Climate (2020–Present)

Decorah (11.8 miles)

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  • Average Low 2020–2025

    39.5 °F

  • Average 2020–2025

    48.2 °F

  • Average High 2020–2025

    56.7 °F
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