While the Midwest seemed to be reverting to winter, Southern California had a spring fling with summer on Monday as high pressure and offshore flow heated up the region.
Temperatures soared to 94 degrees in downtown Los Angeles, and many other locations including the coast had similar highs, some setting records for the date.
In Pasadena, where the National Weather service said it got as hot as 99 degrees, families packed the Rose Bowl Aquatics Center.
"It was hot out, and only on hot days do I like to swim – it's pretty nice when it's hot," said 5-year-old Jane Holmes, who came to swim with her grandmother.
Chris Rockwell, who lives in Eagle Rock, was also at the pool beating the heat with his 14-month-old son Indigo.
"Today at the house it was 100," Rockwell said.
The warmth spread well up the coast with a record 79 degrees at the airport in Monterey, the National Weather Service said.
The beach weather was in stark contrast to the blanket of snow and slate-gray skies left in the aftermath of a storm that marched across the Midwest.
The California heat was not expected to persist.
Forecasters said Southern California coastal areas would see double-digit temperature drops Tuesday as sea breezes pushed back onshore. Valleys will be cooler also but not by as much, the weather service said.
This story has been updated.