A freeze warning was issued by the National Weather Service in Tucson at 12:25 p.m. on Wednesday, Dec. 3.

This warning applies to Upper Santa Cruz River and Altar Valleys, including Nogales; Upper San Pedro River Valley, including Sierra Vista, Benson; eastern Cochise County below 5,000 feet, including Douglas, Willcox; Upper Gila River and Aravaipa Valleys, including Clifton and Safford.

The National Weather Service warns: "Take steps now to protect tender plants from the cold."

See weather radar for Pima County

What are weather service meteorologists saying?

At 12:25 p.m., the weather service issued a statement:

"WHAT: Sub-freezing temperatures between 29 and 32 degrees expected in the upper Gila River valley and in the upper Santa Cruz River Valley/Altar Valley. Sub-freezing tempe

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