The rainfall for the bulk of the last two seasons is now the second driest in 170 years of record for San Francisco. The 21-month total rainfall for the period from July 1, 2019 through March 31, 2021 is just 20.46". This is 45% of the normal rainfall for that period; a deficit of 24.52", which is more than one full rainfall season's total of 23.65". The only drier period was 1975-77 with a total of 18.53".
California Percent of Normal Rainfall (July 1 to March 31, 2021)