Updated map showing climate stations that have ever recorded their lowest temp of the season (no ties) on April 8th or later. Note: additional Alaska stations had their lowest temp on or after Apr 8 but do not yet qualify as a climate station. #akwx @NWSAlaska @AlaskaWx

All those California dots really surprise me. Coldest temperatures around here (San Francisco Peninsula) are usually around the New Year.

Here are the dots in the Bay Area.