Patchy frost is expected to develop again Wednesday morning in parts of San Diego County, but forecasters said the cold morning would give way to sunnier and warmer conditions.
A National Weather Service frost advisory for valleys and deserts is scheduled to expire at 9 a.m. Wednesday. Forecasters said early Wednesday morning temperatures could fall to near or below freezing.
"Clear skies and light winds will allow cold and frosty air to settle into parts of the valleys and lower deserts this morning," according to the weather service.
Residents in the affected areas were again urged to cover sensitive outdoor vegetation, bring pets indoors and place farm animals in barns.
But forecasters said temperatures early Wednesday morning were running slightly higher than at about the same time on Tuesday, likely because higher humidity and dew points were not allowing the mercury to plummet as much.
Despite the cold start, the day is expected to get sunnier and warmer, according to the weather service. High temperatures Wednesday are expected to be around 63 degrees along the coastline, 61 to 66 degrees in the western valleys, 54 to 59 degrees near the foothills, 45 to 54 degrees in the mountains and around 62 degrees in the deserts.
