Ossian Weather Forecast

    • 14
    • 25

    Areas Freezing Fog

    • 20
    • 36

    Partly Sunny

    • 31
    • 35

    Rain/Snow Likely

    • -2
    • 34

    Slight Chance Snow

    • 18
    • 27

    Mostly Cloudy

    • 11
    • 34

    Mostly Cloudy

Today 15 Dec Winneshiek

Partly sunny. Not as cool with Highs in the upper 20s. Southwest Winds 5 to 10 Mph.

Tonight 15 Dec Winneshiek

Partly cloudy in the Evening, then becoming mostly cloudy. Patchy fog. Areas of freezing fog after midnight. Not as cold with Lows around 13. Southwest Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Ossian Temperature Statistics

December Temperature

Decorah (9.3 miles)

  • Lowest 4 December, 2025

    -5.8 °F

  • Average December

    16.5 °F

  • Highest 9 December, 2025

    37.4 °F

Climate (2020–Present)

Decorah (9.3 miles)

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  • Average Low 2020–2025

    39.4 °F

  • Average 2020–2025

    48 °F

  • Average High 2020–2025

    56.6 °F
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