Northeast faces chilly Memorial Day with highs 20 degrees below average.

Tens of millions of Americans living in the Northeast and Mid-Atlantic regions face a stark reality this Memorial Day weekend: it is set to be significantly colder than the recent Christmas season. Meteorologists predict that for the millions in New York, New Jersey, Pennsylvania, Delaware, Maryland, and parts of Connecticut, Virginia, and West Virginia, Saturday temperatures will linger in the low to mid-50s.

This forecast marks a dramatic deviation from the norm, with highs expected to be 15 to 20 degrees Fahrenheit below the typical average for this unofficial start of summer. AccuWeather meteorologists have highlighted that major urban centers like New York, Philadelphia, and Washington DC will likely struggle to match the high temperatures recorded during last Thanksgiving and Christmas. Specifically, Washington is forecasted to see a high of 57 degrees, which trails the 60 degrees recorded on Christmas Day.

The region is not only bracing for the cold but also a massive storm system. This weather event will bring steady rain through Sunday to Vermont, Massachusetts, Rhode Island, Ohio, and Kentucky, potentially dumping up to two inches of rain across the area. Officials warn that these conditions could severely disrupt outdoor activities, lead to ground stops at airports, and significantly impair road visibility.

The cause of this sudden chill is a strong cold front dragging cooler, drier air down from Canada and across the Midwest. This mass of air has quickly displaced the summer-like warmth that brought a heat wave to the East Coast just five days prior. The phenomenon, known as cold air damming, occurs when cool air gets trapped against the eastern side of the Appalachian Mountains. Because the mountains block the cold air from moving east, it piles up over the Northeast, keeping temperatures low for nearly 50 million people stretching from Washington to Boston.

This widespread cooldown represents a shocking reversal from earlier in the week, when cities like New York and Philadelphia soared into the 90s on Tuesday. Philadelphia recently experienced a 98-degree day, capping off its first heat wave of the year and marking the hottest day in May in the city's history. By Saturday, however, Philadelphia faces a plunge to a high of just 55 degrees, illustrating the rapid and potentially dangerous shift in seasonal weather patterns that could impact community safety and daily life.

Just five months ago, temperatures in certain regions reached 53 degrees during the Christmas season. Dan Pydynowski, a senior meteorologist at AccuWeather, noted that for parts of interior Pennsylvania experiencing continuous rainfall throughout Saturday, the RealFeel Temperature might barely climb to 40 degrees.

Looking ahead to the Memorial Day period, more than 50 million individuals are projected to encounter chilly conditions accompanied by persistent precipitation. Beyond this, areas in southern New Jersey, western New York, Maryland, West Virginia, and Michigan are also forecast to see temperatures dip into the 40s over the holiday weekend.

For those anticipating an early onset of summer warmth, forecasters have indicated that these unseasonably cool conditions are likely to persist for several weeks. Paul Pastelok, AccuWeather's lead long-range forecaster, stated that "sneaky cold fronts are expected to continue dropping southward from eastern Canada from late May through mid-June." He further explained that this pattern will "largely knock down any attempt at prolonged warm periods for the Northeast."

Although the official start of summer does not occur until June 21, Memorial Day has historically served as a significant travel weekend for residents attending outdoor gatherings, barbecues, or visiting local beaches and vacation destinations. According to data from the American Automobile Association (AAA), approximately 45 million people were expected to travel at least 50 miles during the extended holiday break.