Jefferson Memorial Park Weather Forecast

    • 20
    • 31

    Slight Chance Snow Showers

    • 12
    • 33

    Snow Showers Likely

    • 14
    • 21

    Snow

    • 16
    • 26

    Chance Snow Showers

    • 21
    • 30

    Mostly Cloudy

    • 32
    • 41

    Mostly Cloudy

    • 27
    • 47

    Rain Showers Likely

Today 12 Dec Ontario

Partly to mostly sunny. Highs Ranging from the mid 20s on the Hilltops to around 30 across the lower Elevations. West Winds 10 to 15 Mph.

Tonight 12 Dec Ontario

Mainly clear Early, then becoming mostly cloudy. Lows 15 to 20. Southwest Winds 5 to 10 Mph, becoming south.

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Jefferson Memorial Park Temperature Statistics

December Temperature

Penn Yan, Penn Yan Airport (19.9 miles)

  • Lowest 4 December, 2025

    3 °F

  • Average December

    25 °F

  • Highest 10 December, 2025

    37.9 °F

Climate (2020–Present)

Penn Yan, Penn Yan Airport (19.9 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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