Thornton Lake Weather Forecast

    • 47
    • 60

    Mostly Sunny

    • 49
    • 72

    Mostly Sunny

    • 49
    • 57

    Mostly Cloudy

    • 60
    • 71

    Partly Sunny

    • 59
    • 75

    Partly Sunny

    • 59
    • 76

    Partly Sunny

Today 19 Dec Fannin

Sunny. Highs around 60. South Winds around 10 Mph.

Tonight 19 Dec Fannin

Mostly clear. Not as cool with Lows in the upper 40s. South Winds 10 to 20 Mph.

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  • Temperature Real-Time

Thornton Lake Temperature Statistics

December Temperature

McKinney - McKinney National Airport (21.7 miles)

  • Lowest 15 December, 2025

    23 °F

  • Average December

    44.9 °F

  • Highest 12 December, 2025

    70 °F

Climate (2020–Present)

McKinney - McKinney National Airport (21.7 miles)

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  • Average Low 2020–2025

    56 °F

  • Average 2020–2025

    66.6 °F

  • Average High 2020–2025

    77.5 °F
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