The coolest night of the season is on the way for much of PST Nation. In fact, a Frost Advisory was just issued by the National Weather Service for our area.

The advisory, which goes into effect overnight, is in effect for BURLINGTON and MERCER counties.

National Weather Service advisory map (October 18)

The National Weather Service expects frost to develop late tonight into early Friday morning with temperatures getting down as low as 33 degrees.

With a frost, of course, it's a good idea to make sure that you take steps to protect tender plants from the cold.

Here's a breakdown of the low temperatures that are being forecasted by the National Weather Service tonight:

Mercer County - 
Lambertville, NJ - 35 degrees
Trenton, NJ - 36 degrees
Princeton, NJ - 34 degrees
Lawrenceville, NJ - 35 degrees

Bucks County - 
Bensalem, PA - 37 degrees
New Hope, PA - 34 degrees
Yardley, PA - 36 degrees
Langhorne, PA - 36 degrees

Philadelphia, PA - 40 degrees

Burlington County - 
Evesham, NJ - 36 degrees
Mount Holly, NJ - 35 degrees
Burlington Township, NJ - 36 degrees
Bordentown, NJ - 35 degrees

(Forecast via weather.gov)

Meanwhile, a freeze warning is in effect for areas just to our north (including Somerset, Hunterdon, Lehigh County, and Upper Bucks County).

Getty Images/iStockphoto

Perhaps, more importantly, it also means that tonight will mark the coldest night of the season so far.

We're not hyping the cold weather because it's not life-threatening or dangerous cold yet. In fact, these kinds of temperatures will be a daily occurrence before year's end. However, it will feel surprising after our recent warm spell. It's actually unseasonably cold for this time of year.

There is good news as we could a little improvement (temperature wise) in the forecast ahead.

On Friday, the sun is back, and temperatures begin a brief rebound — mostly mid-50s up to 60. A morning shower starts the day on Saturday, but it'll be partly cloudy after that, with high temps in the upper 50s to mid-60s.

It looks to cool down quite a bit on Sunday as temperatures struggle to reach 50 degrees across the area.

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