Valley stayed warm enough to avoid freeze

FRESNO, Calif.

Most of the valleys citrus groves stayed above 30 degrees through the night.

Valley citrus growers used running water and wind machines to keep warm air in the groves when temperatures drop below 32 degrees.

Some growers also enlisted help from the sky using helicopters to push warmer air down into the trees. 95 percent of the season's citrus crop is still on the trees and is valued at over a billion dollars.

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