Another cold night in store for county

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SAN DIEGO – A cold air mass, weak winds and mostly clear skies could lead to another cold night across San Diego County, weather experts said Tuesday.

Frost conditions likely in the wind-sheltered valleys and deserts of San Diego and Riverside counties.

Frost advisory in effect from midnight to 9 a.m. Wednesday, according to the National Weather Service. Temperature could fall to 30 to 36 degrees.

Sensitive plants and crops may be damaged or killed if left uncovered.