Lannon Lake Weather Forecast

    • 17
    • 25

    Increasing Clouds

    • 30
    • 43

    Mostly Sunny

    • 11
    • 46

    Breezy

    • 0
    • 17

    Partly Sunny

    • 11
    • 21

    Mostly Cloudy

    • 21
    • 34

    Partly Sunny

Today 25 Feb Big Stone

Partly sunny. Colder with Highs in the mid 20s. Northwest Winds 5 to 10 Mph.

Tonight 25 Feb Big Stone

Mostly cloudy in the Evening, then becoming partly cloudy. Not as cold with Lows around 18. Temperature rising into the lower 20s after midnight. South Winds 5 to 10 Mph, becoming southwest after midnight.

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Lannon Lake Temperature Statistics

February Temperature

Wheaton Municipal Airport (16.8 miles)

  • Lowest 3 February, 2026

    -9.4 °F

  • Average February

    25.4 °F

  • Highest 15 February, 2026

    57.2 °F

Climate (2021–Present)

Wheaton Municipal Airport (16.8 miles)

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  • Average Low 2021–2026

    35 °F

  • Average 2021–2026

    44.9 °F

  • Average High 2021–2026

    54.7 °F
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