https://www.mercurynews.com/2019/11/28/thanksgiving-night-frost-advisory-issued-for-bay-area-before-weekend-of-rain/

The dusting of snow on some Bay Area mountain tops Thursday morning signaled what’s in store for Thanksgiving — after the rain, the cold.

The cold front that brought the Bay Area’s first significant rain this season earlier in the week plunged the mercury into the 30s in many places on Thursday morning.