Fox News Weather Center

Is Warm Weather Here to Stay in Northeast?

After the warmest weather since early last autumn for many areas in recent days, many are wondering if the warmth is here to stay for the remainder of spring and into summer.

There is some good news and bad news in answering that question. Don't pack away the long-sleeves and fleece just yet.

According to Paul Pastelok, chief long-range meteorologist, "For weeks we have been forecasting another spell of chilly weather for the Northeast and much of the Midwest during the latter part of April."

With a few localized exceptions, the weather for the next seven to 10 days or so looks to bring fairly consistent temperatures that average near to above normal much of the time.

For many heading to ball games or practice, this will translate into short-sleeve weather by day and conditions requiring a light jacket at night.

During most days through the middle of the month, people will be able to enjoy the outdoors often and get caught up on yard maintenance.

However, a pattern change will begin to develop just past the middle of the month.

"We expect a significant cooldown to begin over the Upper Midwest and expand southeastward around April 21-23," Pastelok stated.

"The real chill will settle in over the Great Lakes, Ohio Valley and central Appalachians around April 24-28," Pastelok said.

The pattern and its cold air aloft will tend to bring angry-looking clouds and frequent showers to the region and could even bring some wet snowflakes on one or two occasions as far south as the central Appalachians.

While it will be reasonably warm getting into the car by day, those spending time outdoors or walking to the bus stop may need some chilly weather gear.

Since the chilly air will be anchored over the Midwest, the Interstate-95 corridor and interior New England may not be so cool relative to normal and compared to areas farther west.

Air flowing downhill from the Appalachians and some sunshine will help to nullify the chill later in April for much of the I-95 zone.

Such a pattern could still lead to rounds of showers and thunderstorms that form near the Appalachians and wander toward the Atlantic coast.

"The same system causing the chill during the latter part of April is likely to linger into the first week or so of May," Pastelok said.

The end result may bring many days with highs within a few degrees of 60 right through the first part of May for places like New York City. In New York City, high temperatures typically trend upward from 60 during mid-April to 70 by mid-May.

In parts of the central Appalachians, highs on many days may be within a few degrees of 50 when the chill settles in later in the month.

Around Detroit and Chicago, the pattern may bring some days where temperatures are no higher than the 50s. For the Ohio Valley, temperatures may average 5-10 degrees below normal, which for most areas will be near 70 by the end of April.

In addition to some possible wet snowflakes for the mountains and upper Great Lakes, there could be a significant frost or two into the first part of May.

Gardeners having the urge to plant tender warm season flowers and vegetables should hold off an extra week or so from the average date of the last frost.

"The chilly pattern could break for the Northeast during the middle of May," Pastelok said. plans to release its 2015 summer forecast for the United States during late April.