A cold snap gripped the West Coast for the fifth day Monday, and some California citrus growers began to see damage.
The extreme chill in the West comes as the Eastern U.S., from Atlanta to New York City, is seeing spring-like weather.
In the San Joaquin Valley, where farmers are fighting to protect about $1.5 billion worth of citrus fruit on their trees, Sunday temperatures dropped to 25 degrees in some areas and stayed low longer than previous nights.
Prolonged temperatures in the mid-20's or below cause damage to citrus crops.
"It was our coldest night to date," said Paul Story of Exeter-based California Citrus Mutual, an association of the state's 3,900 citrus growers. "I think mandarin growers are going to see a range of significant damage, enough that they will have to separate their crops."
Mandarins are more susceptible to cold than other citrus and start to freeze at about 32 degrees, Story said. Because many mandarin trees were planted in recent years as the fruit's popularity soared, they are grown in colder areas outside the traditional citrus belt.
Other citrus crops saw little or minimal damage, Story said. This year's high sugar content in oranges helped protect them, he said, because sugar inhibits freezing.
Growers deployed wind machines to keep the warm air closer to the ground and irrigation to raise the temperature in the groves. Rows farthest away from the protection could be damaged, Story said. And farmers who do not have wind machines could lose crops.
Lindsey-based Robert LoBue -- who grows 1,000 acres of citrus, including mandarins -- said wind machines were critical in his groves, but saving the crop doesn't come cheap. LoBue runs one wind machine for every 10 acres and has to employ a crew to man them.
"We're very diligent, we run the wind and water all night," LoBue said, "but we're spending thousands of dollars to protect these crops."
And farmers are on the hook for a fifth cold night: a freeze warning remains in effect until 10 a.m. Tuesday for central California.
In Southern California, strong winds helped to keep crops out of danger by keeping the cold from settling.
Temperatures in downtown Los Angeles plummeted to 34 degrees on Monday, breaking the record of 36 set on Jan. 14, 2007.
Winds gusted to 41 mph in Riverside, while Santa Ana and Van Nuys reported gusts to 26 mph.
In Angeles National Forest, where overnight temperatures have been dropping into the 20s, Arcadia hiker Danny Kim, 28, was found Sunday night after surviving 26 hours in the frigid West Fork wilderness. Kim was airlifted to a hospital for treatment of hypothermia.
The body of a homeless man was found just before dawn Monday on a Los Angeles Skid Row sidewalk, but it was unclear if the death was caused by the record cold.
In Beverly Hills, fans brought heavy coats and scarves as they waited along the red carpet hoping to catch glimpses of stars arriving for the Golden Globes ceremony Sunday evening. Some of the actors shivered but weren't complaining.
"I'd rather be nippy than boiling hot," said actress Julia Louis-Dreyfus, who arrived in a strapless dress. "No, I'm not wearing any leggings or long underwear."
In San Diego, zookeepers offered extra heat and shelter for some animals.
The cold air was flowing east into neighboring Arizona, where metropolitan Phoenix was marking one of its coldest stretches in years. Temperatures over the weekend dipped to 30 degrees at Sky Harbor International Airport and fell well below zero in mountainous Flagstaff.