Jefferson Memorial Park Weather Forecast

    • 20
    • 28

    Mostly Cloudy

    • 23
    • 37

    Mostly Cloudy

    • 16
    • 33

    Snow Showers Likely

    • 11
    • 21

    Mostly Cloudy

    • 27
    • 32

    Snow Showers Likely

    • 27
    • 38

    Rain/Snow

    • 22
    • 33

    Chance Snow Showers

Today 5 Dec Ontario

Mostly sunny and cold with Highs Ranging from the mid 20s on the Hilltops to the upper 20s across the lower Elevations. South Winds around 10 Mph, becoming light.

Tonight 5 Dec Ontario

Mostly cloudy. Lows 20 to 25. Light Winds, becoming south 5 to 10 Mph.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Jefferson Memorial Park Temperature Statistics

December Temperature

Penn Yan, Penn Yan Airport (19.9 miles)

  • Lowest 3 December, 2025

    17.1 °F

  • Average December

    27.1 °F

  • Highest 1 December, 2025

    34 °F

Climate (2020–Present)

Penn Yan, Penn Yan Airport (19.9 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2020–2025

    42 °F

  • Average 2020–2025

    50.6 °F

  • Average High 2020–2025

    59.2 °F
Get WillyWeather+ to remove ads