Green Valley State Park Weather Forecast

    • 14
    • 41

    Chance Snow

    • 31
    • 38

    Partly Sunny

    • 22
    • 42

    Partly Sunny

    • 30
    • 41

    Mostly Cloudy

    • 37
    • 50

    Partly Sunny

    • 36
    • 54

    Mostly Cloudy

    • 40
    • 57

    Mostly Cloudy

Today 18 Dec Union

Mostly sunny late this Morning, then mostly cloudy with a slight chance of snow this afternoon. Very windy with Highs in the lower 40s. Temperature falling into the mid 20s this afternoon. Northwest Winds 25 to 35 Mph with Gusts up to 45 Mph. Chance of snow 20 percent.

Tonight 18 Dec Union

Partly cloudy in the Evening, then clearing. Windy and much cooler with Lows around 15. Northwest Winds 20 to 30 Mph with Gusts up to 45 Mph, Diminishing to 15 to 20 Mph with Gusts up to 30 Mph after midnight.

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Green Valley State Park Temperature Statistics

December Temperature

Creston Municipal Airport (6.2 miles)

  • Lowest 4 December, 2025

    -4 °F

  • Average December

    22.1 °F

  • Highest 16 December, 2025

    48.2 °F

Climate (2020–Present)

Creston Municipal Airport (6.2 miles)

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  • Average Low 2020–2025

    41.2 °F

  • Average 2020–2025

    51.2 °F

  • Average High 2020–2025

    61.6 °F
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