"We came through fine. It didn't get cold enough, for long enough anywhere in all our different regions," Andrew Meadows, a spokesman for Florida Citrus Mutual, told Reuters.

Typically, citrus can be damaged by four hours or more of temperatures below 28 degrees Fahrenheit (minus 2 Celsius) but Meadows said that had not happened, even in northern citrus-producing regions of Florida.

"Actually chilling days like this can be good for the fruit. It sweetens them up," Meadows said.

"It's supposed to heat up a couple of degrees, one or two degrees tonight, so we're optimistic," he added.

He did not elaborate, but even when orange groves are mauled by a freeze the fruit is usually salvageable but it will yield less juice than normal.

U.S. frozen concentrated orange juice futures pared gains on Monday after jumping more than 3 percent in early trade to a three-week high on concern about freezing temperatures in Florida's citrus groves.

Florida accounts for about 75 percent of the U.S. orange crop and as much as 40 percent of the world's orange juice supply.