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“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.

To the east, the freezing temperatures have already done enough damage to southwestern Arizona lettuce crops that prices were increasing, said Kurt Nolte, a Yuma, Ariz.-based agricultural agent for the University of Arizona.

The area provides much of the nation’s leafy greens during the winter, and farmers are reporting damage to many romaine and iceberg lettuce crops. The cold is freezing the heads of the lettuce and affecting the quality and yield, Mr. Nolte said.

The price for a carton of lettuce in Yuma two weeks ago was $7 to $8. As of Monday, it costs around $20 per carton, he said.

Metropolitan Phoenix marked one of its coolest stretches since 1988, and Sunday morning’s low of 7 degrees in Douglas, Ariz., broke a record for January in the Mexican border town.

In Nevada, the temperature in Ely plummeted to 24 below zero early Monday and wind chills were expected to drop to near 40 below into Tuesday.

And in northern New Mexico, parts of Interstate 25 and some other highways were snow-packed and icy Monday, and officials warned travelers that additional light snow could lead to hazardous driving conditions when coupled with the freezing temperatures.