Grammar Airport Weather Forecast

    • 24
    • 29

    Snow Likely

    • 22
    • 38

    Rain/Snow

    • 19
    • 28

    Chance Snow Showers

    • 20
    • 29

    Snow Showers Likely

    • 16
    • 26

    Chance Snow Showers

    • 14
    • 23

    Chance Snow Showers

Today 9 Dec Ontario

Mostly sunny in the Morning, then mostly cloudy with a chance of snow Showers in the afternoon. Highs in the lower 30s. South Winds 5 to 10 Mph, increasing to 10 to 15 Mph with Gusts up to 30 Mph. Chance of snow 50 percent.

Tonight 9 Dec Ontario

Mainly clear. Cold with Lows 5 to 10 above. Light Winds.

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Grammar Airport Temperature Statistics

December Temperature

Penn Yan, Penn Yan Airport (16.2 miles)

  • Lowest 4 December, 2025

    3 °F

  • Average December

    25.3 °F

  • Highest 6 December, 2025

    36 °F

Climate (2020–Present)

Penn Yan, Penn Yan Airport (16.2 miles)

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  • Average Low 2020–2025

    42 °F

  • Average 2020–2025

    50.6 °F

  • Average High 2020–2025

    59.2 °F
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