Marathon Weather Forecast

    • 25
    • 35

    Decreasing Clouds

    • 17
    • 32

    Chance Snow Showers

    • 23
    • 33

    Rain/Snow

    • 26
    • 40

    Rain/Snow Likely

    • 23
    • 35

    Chance Snow Showers

    • 32
    • 44

    Rain Showers Likely

Today 20 Dec Cortland

Partly sunny this Morning, then becoming mostly cloudy. Highs in the mid 30s. West Winds 10 to 15 Mph, becoming south this afternoon.

Tonight 20 Dec Cortland

Mostly cloudy in the Evening, then becoming partly cloudy. Lows in the mid 20s. Southwest Winds 10 to 15 Mph. Gusts up to 30 Mph in the evening.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Marathon Temperature Statistics

December Temperature

Cortland County-Chase Field (13.7 miles)

  • Lowest 5 December, 2025

    -5.8 °F

  • Average December

    23.1 °F

  • Highest 17 December, 2025

    42.8 °F

Climate (2020–Present)

Cortland County-Chase Field (13.7 miles)

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  • Average Low 2020–2025

    37.9 °F

  • Average 2020–2025

    47.3 °F

  • Average High 2020–2025

    56.5 °F
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