Sinclair Weather Forecast

    • -2
    • 15

    Chance Snow

    • 17
    • 26

    Mostly Cloudy

    • 23
    • 38

    Chance Rain

    • 11
    • 28

    Chance Snow

    • -1
    • 19

    Chance Snow

    • -8
    • 6

    Cold

Today 7 Dec Grundy

Sunny. Highs around 15. North Winds around 15 Mph, Diminishing to 5 to 10 Mph this afternoon.

Tonight 7 Dec Grundy

Mostly cloudy. A chance of snow after midnight. Cold with Lows around 2 below. Temperature rising to around 8 above after midnight. Northeast Winds around 5 Mph, becoming southeast after midnight. Chance of snow 30 percent.

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Sinclair Temperature Statistics

December Temperature

Waterloo, Waterloo Municipal Airport (16.8 miles)

  • Lowest 4 December, 2025

    -13 °F

  • Average December

    16.8 °F

  • Highest 3 December, 2025

    33.1 °F

Climate (2020–Present)

Waterloo, Waterloo Municipal Airport (16.8 miles)

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  • Average Low 2020–2025

    40.2 °F

  • Average 2020–2025

    51 °F

  • Average High 2020–2025

    61.7 °F
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