Frosty Morning Up to 20 Degrees Colder Grips Maryland, Delaware and Virginia as Sunny 60s Return and Offshore Coastal Storm Holds 30% Chance
BALTIMORE, MD — The recent streak of rainy Sundays came to an end on Sunday, October 18, replaced by a frosty morning across Maryland, Delaware, Northern Virginia, and Southern Pennsylvania. Temperatures at daybreak ran 10 to 20 degrees colder than the previous morning as a strong high pressure system settled over the region, setting the stage for a sunny, calmer, and more comfortable day ahead.
A Sharp Drop in Morning Temperatures
The 24-hour temperature change map shows a dramatic cooldown across the entire Mid-Atlantic. Frederick saw the largest drop at 23 degrees colder than Saturday morning, while York fell by 20 degrees and Easton by 18 degrees. Salisbury dropped 17 degrees, with Lancaster, Gettysburg, Westminster, and Dover all running about 16 degrees colder.
Other notable declines included Harrisburg, Hagerstown, and Georgetown at 15 degrees, along with Winchester and Cambridge at 14 degrees. Washington and La Plata cooled by 13 degrees, while Baltimore and Bel Air ran 12 degrees colder. Even the milder spots, such as Philadelphia, Annapolis, and Lexington Park, were 10 to 11 degrees cooler than a day earlier.
Frost and Freezing Temperatures Across Western Areas
Morning readings at 6:00 AM dipped below freezing in several inland communities. Cumberland fell to 31 degrees, while York reached 32 degrees and Frederick and Harrisburg, Virginia, sat at 33 degrees. Lancaster recorded 35 degrees, with McHenry and Gettysburg at 36 degrees and Harrisburg, Pennsylvania, near 37 degrees.
A hard freeze signal extended across portions of the interior Northeast, while frost formed in many valleys and rural areas of the Mid-Atlantic. Closer to the Chesapeake Bay, temperatures stayed milder, with Annapolis and Lexington Park near 48 degrees and Washington around 44 degrees.
Sunny Skies and Lighter Winds Bring Highs Near 60
Despite the cold start, abundant sunshine and lighter winds will help temperatures recover into the upper 50s and low 60s this afternoon. Harrisburg, Hagerstown, Cumberland, Baltimore, Annapolis, and Salisbury are expected to reach about 61 degrees. Washington, Lancaster, Easton, Cambridge, Frederick, and Lexington Park will top out near 60 degrees.
Slightly cooler highs are forecast for Philadelphia and Atlantic City at 58 degrees, while Dover, Georgetown, Ocean City, Gettysburg, and La Plata will reach about 59 degrees. McHenry will stay the coolest at 55 degrees.
Coastal Storm Forming Offshore
Meteorologists are monitoring a coastal storm forming off the Southeast coast near the Carolinas. The National Weather Service currently assigns this system a 30 percent chance of tropical or subtropical development over the next 7 days, placing it in the low chance category.
The latest European model guidance keeps the storm offshore, which would limit direct impacts across Maryland, Delaware, and Virginia. Even so, forecasters will continue tracking its path closely, as small shifts could bring changes in coastal winds and surf along the Delmarva shoreline.
Is the Cooler Pattern Here to Stay
The big question now is whether this chill marks a brief four-day blip or the beginning of a lasting seasonal trend. Temperatures are expected to remain below the recent warmth for several days, and forecasters are watching longer-range data to determine whether autumn’s colder air is settling in for good.
Residents should protect sensitive plants overnight in frost-prone areas and dress in layers for chilly mornings and pleasant afternoons this week.
For continuing coverage of frost alerts, coastal storm tracking, and critical weather analysis across the United States, visit Weather Radar.