Grammar Airport Weather Forecast

    • 25
    • 33

    Mostly Cloudy

    • 16
    • 38

    Mostly Cloudy

    • 22
    • 27

    Wintry Mix

    • 30
    • 34

    Rain Showers

    • 21
    • 42

    Snow Showers Likely

    • 17
    • 26

    Chance Snow Showers

Today 24 Dec Ontario

Mostly cloudy in the Morning, then becoming mostly sunny. Highs Ranging from around 30 on the Hilltops to the mid 30s across the lower Elevations. Northwest Winds 10 to 20 Mph with Gusts up to 35 Mph in the Morning, Diminishing to 10 Mph or less.

Tonight 24 Dec Ontario

Mostly cloudy. Early evening Lows in the mid 20s, then Temperatures rising into the lower 30s. 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

    26.8 °F

  • Highest 19 December, 2025

    54 °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

    50.5 °F

  • Average High 2020–2025

    59.2 °F
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