Grammar Airport Weather Forecast

    • 6
    • 15

    Chance Snow Showers

    • 10
    • 16

    Mostly Cloudy

    • 11
    • 25

    Partly Sunny

    • 12
    • 28

    Mostly Cloudy

    • 7
    • 20

    Mostly Cloudy

    • 9
    • 21

    Mostly Cloudy

Today 31 Jan Ontario

Mostly cloudy with a 50 percent chance of snow Showers. Cold with Highs Ranging from 5 to 10 above on the Hilltops to around 15 across the lower Elevations. Light northwest Winds.

Tonight 31 Jan Ontario

Lake effect snow Showers likely. Accumulation an inch or less. Cold with Lows Ranging from zero to 5 below on the Hilltops to zero to 5 above across the lower Elevations. West Winds 10 Mph or less. Chance of snow 70 percent.

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Grammar Airport Temperature Statistics

January Temperature

Penn Yan, Penn Yan Airport (16.2 miles)

  • Lowest 24 January, 2026

    -2 °F

  • Average January

    24 °F

  • Highest 9 January, 2026

    50 °F

Climate (2021–Present)

Penn Yan, Penn Yan Airport (16.2 miles)

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  • Average Low 2021–2026

    41.8 °F

  • Average 2021–2026

    50.4 °F

  • Average High 2021–2026

    59.1 °F
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