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PHOTOS: Warmest Weather Since Last Autumn Sends East Into Bloom

The past week has delivered some of the warmest weather to the mid-Atlantic and Northeast since early last autumn, sending trees and flowers into bloom.

"The cool start in April slowed the bloom of things down a little bit," Expert Long-Range Forecaster Paul Pastelok said. "It set growth in the East back about a week compared to normal."

"But, over the past four or five days, temperatures have started to climb back up again," he said.

The result has been a slightly late, but nonetheless, vibrant bloom of trees and flowers across the mid-Atlantic and Northeast.

Washington D.C.'s famed cherry blossoms bloomed late this season and other areas across the Northeast suffered fro... in AccuWeather Headlines on LockerDome

During the month of April, temperatures typically trend upward by 10 degrees Fahrenheit from the beginning of the month to the end over much of the mid-Atlantic and New England, according to Senior Meteorologist Alex Sosnowski.

In northern New England, the upward trend can be close to 15 degrees from beginning to end.

However, despite blooming gardens and recent sunny days, it's too soon to pack away the long-sleeve shirts just yet.

A significant cooldown is in the offing toward the end of the month.

"Take your average last frost date and add a week onto that this year before you start planting your annuals," Pastelok said.