Ah but it's cold outside indeed with Wednesday morning lows in the 20s in several areas, including 21 degrees reported in Petaluma, according to the National Weather Service.
Other low temperatures included 27 in Santa Rosa and Rohnert Park and 31 degrees in Geyserville and Sebastopol, according to local residents reporting to the weather agency.
"This past night was probably the coldest. It'll be chilly again tonight but not quite as cold," said Austin Cross, National Weather Service meteorologist.
Wednesday's clear and frosty weather was due to turn to rain starting by midnight.
Holiday shopping weather Thursday was slated to be very wet.