Northern California shivered through a record-breaking cold day on Friday as an arctic air mass continued to settle over the region, setting temperature records from the coast to the Central Valley.
San Francisco broke a 103-year-old record this week when the city topped out around 50 degrees, beating a mark set in 1922. Vacaville reached just 44 degrees, its coldest high in four years. Sacramento hit 45 degrees, its coldest since 2022. Marysville and Oroville dropped even lower, recording highs of 43 and a bone-chilling 22 degrees.
The National Weather Service issued a cold-weather advisory through Saturday morning for eastern Sonoma County and all of Napa County, warning of temperatures in the 33–36 degree range and upper 20s in higher terrain—conditions especially dangerous for unsheltered residents…