Despite a rather dismal amount of rainfall in San Francisco thus far in December (0.15") this is only the 32nd driest beginning to therainfall season (Jul 1 to June 30) going back to 1849-1850. There has been 3.40" to date; thanks mostly to a nearly normal November.
However, looking at similar years with between 2.90" and 3.90" (i.e., +/- 0.50" from the current 3.40") only 4 of those 22 years (18%) have finished above normal (23.65").
