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Arizona’s desert calm turns sharply cold as clear skies and light winds allow heat to escape fast after sunset. The air feels crisp before dawn, frost sparkles on shaded surfaces, and sensitive plants face real risk as winter tightens its grip on southern Arizona.
According to the National Weather Service in Tucson, a Freeze Warning remains in effect from midnight through 9 a.m. Saturday for the Tucson metro, the Santa Cruz River Valley, and parts of Pinal County. Overnight lows are expected to fall into the upper 20s to near 30 degrees, with some colder pockets dipping to around 25 degrees by early Saturday morning…