The Pacific storm that passed through San Diego County on Monday and Tuesday left behind some of the coldest temperatures of the year. And the cold will last into Thursday before the region slowly begins to warm up, says the National Weather Service.
A frost advisory will be in effect for the eastern half of the county from 10 p.m. Wednesday to 9 a.m. on Thursday.
Wednesday’s pre-dawn frost produced icy roads that closed four school districts across the county.
The weather service says that daytime highs will reach the upper 50s in San Diego and the 40s and low 50s across inland valleys and foothills. But temperatures will plummet again on Wednesday night, falling to 26 in Julian, 33 in Ramona, 36 in Oceanside and Miramar, 38 in Escondido, and 41 in San Diego.