Temperatures more appropriate for April will return to much of the Northeast during the middle of this week, following Memorial Day warmth.
A push of cool air is forecast to advance southward from eastern Canada and will reach New England on Tuesday, the upper mid-Atlantic during Wednesday and part of the southern mid-Atlantic by Thursday.
In the wake of the cool push, known as a back door front, temperatures will be slashed by 20 degrees F in many cases, when compared to their 80-degree-plus levels from Memorial Day.
The warm air never made it in to northern New England, but the people in Boston will feel the cool air on Tuesday.
By Wednesday, highs will be in the 50s around Boston and the 60s around New York City and Philadelphia.
On Thursday, temperatures may reach no higher than 70 F around Washington, D.C.
Areas right along the coast will experience a breeze from the east and northeast that will add to the chill. In many cases, the cool air will be accompanied by low clouds and areas of fog.
The cool air will reach inland as well, but the change may be a bit more gradual. Cities from Albany, New York, to Scranton, Pennsylvania, and Hagerstown, Maryland, will experience the cooldown over a couple of days.
During the transition to cooler weather, moisture spilling northward from the Gulf of Mexico will lead to multiple showers and thunderstorms as millions head back to work at midweek.
After temperatures take the plunge, cool air is forecast to linger through the coming weekend. Highs by this coming Saturday are projected to be near 60 F in Boston, near 70 F in New York City and in the 70s in Washington, D.C.
By the weekend, some cooler air will settle in west of the Appalachians and around the lower Great Lakes as well.
Indications are that the pattern of cool air making frequent visits to the Northeast may continue in the weeks ahead.
According to AccuWeather Long Range Meteorologist Mark Paquette, "Through the first part of the summer, the Northeast, especially Boston and New York City, are unlikely to have long-lasting heat."
The jet stream, a river of high-speed air well above the ground, will continue to dip southward over the Northeastern states.
"We expect only brief episodes of heat or above-average warmth through much of June and perhaps a while longer in the Northeast," Paquette said.
"The warm surges would only occur right ahead of the next push of cool air in the Northeast, but warmth would be longer lasting and more persistent farther south over the mid-Atlantic, around Washington, D.C."
During early July, high temperatures typically range from near 80 F around Boston to the middle 80s around New York City and Washington, D.C.
On a warmer note, even if cool air continues to make invasions into the region during early July, temperature dips may only translate to highs in the 70s across coastal New England and the lower 80s farther south in the mid-Atlantic with a few exceptions.
The AccuWeather long range team expects August to bring more persistent, stronger heat to the Northeast.