If spring skiing in California means hitting the slopes in shorts and a T-shirt, what do you wear for summer skiing? A swim suit?

Ski enthusiasts might find themselves confronted with this question as Squaw Valley Alpine Meadows plans to stay open until July 4 this year.

The Tahoe-area resort has seen some 565 inches of accumulative snowfall this season. That's over 47 feet.

"In 2017 alone, since January 1, we've had 460 inches," said Sam Kieckhefer, a spokesperson for Squaw Valley Alpine Meadows. "Our season average is 450 inches. We received more snow since the start of 2017 than our average season."

Kieckhefer added: "We are 91 days into our season, and we're expecting to operate on July 4 and so that means we're not even halfway done with the season."

More for you News Photos show the insane amounts of snow piled up in Tahoe

A series of weather systems known as atmospheric rivers have blasted the Sierra Nevada this season, resulting in impressive snowfall totals.

These plumes of vapor originate in the Pacific, and collect moisture as they travel across the ocean. Upon making landfall, they turn on like fire hoses, spewing rain and snow.

"We usually see three or four atmospheric rivers in a season," said Scott McGuire, a meteorologist with the National Weather Service office in Reno. "We've already had 10. We've had so much snow to the point where it's getting hard to measure."

The back-to-back storms have brought the largest snowpack to the Sierra Nevada in 22 years, a true gift to ski resorts where snow has been scarce and ski seasons short during five years of drought.

Kirkwood, Northstar and Heavenly have all recorded around 550 inches since the start of the season and today the group of resorts owned by Vail Resorts announced extensions of their ski seasons. Kirkwood will keep lifts running through April 16 and Northstar and Heavenly through April 23.This year

South of the Tahoe area, Mammoth Mountain plans to stay open until July.