Heavy Great Lakes Snow through Friday; Extreme Cold and Potential for Major Winter Storm Late Week into this Weekend

Multiple clipper systems will bring cold temperatures and enhance lake-effect snow downwind of the Great Lakes. An arctic blast will bring frigid temperatures accompanied with gusty winds that may lead to dangerous wind chills beginning in the Northern Plains Thursday before expanding to the South and East. An expansive winter storm will start Friday in the Southern Rockies/Plains and Mid-South. Read More >

Current conditions at

Trenton-Mercer Airport (KTTN)

Lat: 40.28°NLon: 74.82°WElev: 210ft.

Fair

2°F

-17°C

Humidity 72%
Wind Speed NW 3 mph
Barometer 30.52 in (1033.5 mb)
Dewpoint -5°F (-21°C)
Visibility NA
Last update 21 Jan 1:53 am EST
Extended Forecast for

Tullytown PA

  • Overnight

    Overnight: Clear, with a low around 5. Calm wind.

    Low: 5 °F

    Clear

  • Wednesday

    Wednesday: Increasing clouds, with a high near 35. Light south wind increasing to 10 to 15 mph in the morning.

    High: 35 °F

    Increasing
    Clouds

  • Wednesday Night

    Wednesday Night: Cloudy, then gradually becoming partly cloudy, with a low around 30. Southwest wind 5 to 10 mph.

    Low: 30 °F

    Decreasing
    Clouds

  • Thursday

    Thursday: Mostly sunny, with a high near 45. West wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 45 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 25. West wind around 5 mph becoming calm  in the evening.

    Low: 25 °F

    Mostly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 33.

    High: 33 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 10.

    Low: 10 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 19.

    High: 19 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Snow likely, mainly after 1am.  Cloudy, with a low around 12. Chance of precipitation is 60%.

    Low: 12 °F

    Chance Snow
    then Snow
    Likely

Detailed Forecast

Overnight
Clear, with a low around 5. Calm wind.
Wednesday
Increasing clouds, with a high near 35. Light south wind increasing to 10 to 15 mph in the morning.
Wednesday Night
Cloudy, then gradually becoming partly cloudy, with a low around 30. Southwest wind 5 to 10 mph.
Thursday
Mostly sunny, with a high near 45. West wind 5 to 10 mph, with gusts as high as 20 mph.
Thursday Night
Mostly cloudy, with a low around 25. West wind around 5 mph becoming calm in the evening.
Friday
Partly sunny, with a high near 33.
Friday Night
Mostly cloudy, with a low around 10.
Saturday
Partly sunny, with a high near 19.
Saturday Night
Snow likely, mainly after 1am. Cloudy, with a low around 12. Chance of precipitation is 60%.
Sunday
Snow. High near 21. Chance of precipitation is 80%.
Sunday Night
A chance of snow. Mostly cloudy, with a low around 9. Chance of precipitation is 50%.
Monday
A chance of snow. Partly sunny, with a high near 24. Chance of precipitation is 30%.
Monday Night
Partly cloudy, with a low around 9.
Tuesday
Mostly sunny, with a high near 24.
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ABOUT THIS FORECAST

 
Point Forecast:
Tullytown PA
 40.12°N 74.83°W (Elev. 13 ft)
4:10 pm EST Jan 20, 2026
2am EST Jan 21, 2026-6pm EST Jan 27, 2026
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database