September 19 2020

A Frost Advisory has been issued for Sunday Morning September 20 for southern Pennsylvania and parts of western Maryland. That may not include your home, but if you live in the colder suburbs of Maryland north and west of Baltimore, you may see some as well. In fact, it happened earlier today. Frost can do some damage to sensitive crops, stimulate others for harvest, and trigger the leaves to start changing.

Frost Advisory Sunday

This first local Frost Advisory from The National Weather Service includes nearby York and Adams Counties in southern Pennsylvania, and many mountain regions west and north. In Maryland, Hagerstown, Cumberland, and Deep Creek Lake are included. I believe there may be spots with frost in central Maryland, so this could include your place.

Frost Advisory Sunday September 20 Expanded


Frost Seen Saturday Morning

This frosty view was in New Windsor this morning, sent to me from Wakefield Valley Nursery.

Surface temperatures can be in the upper 30s to allow for ice crystals to form on the grass.

Frost Saturday Morning Maryland Sepptember 19

Weather Set Up

Saturday Evening

We finally cleared out the sky for the blue color we missed.  The evening sunset with this crescent moon. There were some high clouds to the southwest, but we should be generally clear tonight.

September 19 sunset cresent moon Saturday evening


Dew Point Temperatures = Coolest It Could Get

In the evening we look at the dew point for a signal of how much moisture is in the atmosphere. When the air is clear and still, we can drop the temps quickly to that level when the moisture would start to condense. That is a signal for the coolest it could get if conditions are perfect.

On Maryland, the Dew Point Temperature was 34ºF in both Westminster and at BWI.

There are other factors that limit the cooling.  Urban Heat Island is one of them by the airport. So BWI will NOT get that chilly. But Westminster could get closer.

September 19 weather dew point temperatures Saturday evening


Climate Data for Baltimore

I do not see a record low, but it may get close.

Normal Low = 56ºF

Record Low = 42ºF in 1956 and 1959

Sunrise = 6:52 AM. The coolest temps wil be within  about 30 to 60 minutes of this time.


Forecast Lows

The NAM 3 Km Model is showing lows in the 30s in parts of central Maryland:

  • Frederick: 34ºF
  • Westminster: 39ºF

I also think frost could be seen in western Howard County, Baltimore’s Hereford Zone, and northern Harford County.

NOT near the beltways or by the water.

Weather Forecast Low Temperatures Sunday September 20


Explore More:

Typical First Frost and Freeze



Quick Warm Up

With sunshine, the afternoon temperatures will get back to the mid 60s in central Maryland

Weather Forecast High Temperatures Sunday September 20


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14 Local Maryland Pages (and York PA)

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Local Hourly Forecasts and Local Radar
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Also See:

Severe Storm Report Photos And Video From Thursday

Lightning_I95 Baltimore Sep 3Annapolis Storm September 3

Storm Reports All September 3


Maryland Trek Team Shirt

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Trek Team Shirt Gray

Maryland Trek Cycle Jerseys From Hill Killer

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Also See:

July 2020 The hottest on record. Will it hint at snow this winter?


Record Hottest Month in Baltimore July 2020


Comet NEOWISE Viewing All July (photos/video)

Comet NEOWISE Bob Gelety


Maryland Strong Love ❤️ 

My ‘bonus’ daughter made this map of Maryland a few years ago. We brought it back for needed positivity. Now on her pick of tanks, and this cool Maryland T for men or women.

Click here or on the image to see more

This is all LOCAL: Made by Maryland Print House; Proceeds support my Maryland Trek 7 this August for Just In Power Kids.MarylandStrongLoveJaiden


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Other  Links:

Was Your County Not Included?

Click this map for more on the regional forecast zones


Baltimore Weather At BWI May Not Be As Hot As Reported

Construction at the airport close to the weather station may be added artificial heat. Click here or the image for the details.


Also See:

Double Solar Halo

Double solar halo June 8


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