ATLANTA — An arctic blast eased its grip on much of the U.S. on Wednesday, with winds calming and the weather warming slightly a day after temperature records — some more than a century-old — shattered up and down the Eastern Seaboard.

In Atlanta, where a record low of 6 degrees hit early Tuesday, fountains froze over, a 200-foot Ferris wheel shut down and Southerners had to dig out winter coats, hats and gloves they almost never have to use. It shouldn’t take too long to thaw out, though. The forecast Wednesday was sunny and 42 degrees.

In the Midwest and East, where brutal polar air has lingered over the past few days, temperatures climbed but were still expected to be below freezing.

In a phenomenon that forecasters said is actually not all that unusual, all 50 states saw freezing temperatures at some point Tuesday. That included Hawaii, where it was 18 degrees atop Mauna Kea, a dormant volcano.

It was 1 degree in Reading, Pa., and 2 in Trenton, N.J. New York City plummeted to 4 degrees; the old record for the date was 6, set in 1896.