A stubborn layer of fog and trapped cold air delivered San Francisco’s chilliest fall day in six years on Friday, a sharp change for a city better known for its mild November afternoons.
The official high reached just 52 degrees, according to National Weather Service climate data, marking the city’s coldest temperature during meteorological fall since November 2019.
A strong temperature inversion settled over the region, locking fog in place and preventing any meaningful warm-up through the day…