Snow in California

My daughter Kristine called this morning and asked if it had snowed in San Dimas, and I told her it was cold but we had no snow. She said there was snow on her car when she left for work in Rancho Cucamonga at 7:00 this morning. Now this is unusual, but not unheard of. The San Dimas Post Office has a photograph in the lobby with San Dimas dusted in snow ten years ago.