July 18, Dry For 150 Years, Gets Rain

San Francisco Hits Strange Milestone -- First-Ever Recorded Rainfall For July 18 San Francisco has weather records stretching back to 1849, and no July 18 on any of those days had ever seen rain. Until this year. Wednesday say the first measurable rainfall -- and it was just barely measurable, at 0.01 inch -- ever to fall on the date. The record is almost completely meaningless except for trivia-lovers. And here are two more bits of trivia: July 7 and 14 remain rainless in the official record.