Tens of millions of Americans awoke to temperatures that felt more like winter than spring on April 7, and forecasters warned of another overnight freeze to come.

Freeze warnings extended across states from the Midwest to the East Coast, including Illinois, Indiana, Ohio, West Virginia, Virginia, Maryland, Pennsylvania, Delaware and New Jersey. Several areas will also be under a freeze watch or warning the night of April 7 into the early morning of April 8, the National Weather Service warned.

Temperatures were expected to drop as low as the 20s, the weather service said.

Cold conditions should last through about midweek, with daytime highs in major Northeast cities, including Boston and New York City, remaining in the 40s through April 8 before "rapid warming" begins later in the week, AccuWeather reported. In the Midwest, daytime highs could struggle to get above the 30s, according to the outlet. Snow showers and flurries are also expected in parts of Pennsylvania, northern New Jersey, New York and into New England on April 7.

Meanwhile, unsettled weather was threatening slow-moving rain and storms in Florida and another kona storm in Hawaii.