Waterloo Park Weather Forecast

    • 36
    • 64

    Mostly Sunny

    • 48
    • 59

    Mostly Sunny

    • 47
    • 74

    Mostly Sunny

    • 47
    • 60

    Mostly Cloudy

    • 59
    • 67

    Partly Sunny

    • 60
    • 75

    Partly Sunny

    • 59
    • 75

    Partly Sunny

Today 18 Dec Grayson

Sunny. Highs in the mid 60s. Northwest Winds 15 to 20 Mph.

Tonight 18 Dec Grayson

Mostly clear. Much cooler with Lows in the mid 30s. North Winds 10 to 15 Mph, becoming northwest around 5 Mph after midnight.

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  • Temperature Real-Time

Waterloo Park Temperature Statistics

December Temperature

Sherman/Denison, Grayson County Airport (5.6 miles)

  • Lowest 15 December, 2025

    22.5 °F

  • Average December

    41.2 °F

  • Highest 12 December, 2025

    68 °F

Climate (2020–Present)

Sherman/Denison, Grayson County Airport (5.6 miles)

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  • Average Low 2020–2025

    55.4 °F

  • Average 2020–2025

    64 °F

  • Average High 2020–2025

    76.3 °F
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