Annual precipitation averaged from 1971 to 2000, with an average of 66 days with measurable precipitation. Susanville Airport has averaged a somewhat higher between 1893 and 2012. At the airport the wettest calendar year has been 1907 with and the driest 1976 with , though the wettest "rain year" was from July 1937 to June 1938 with as against between July 1906 and June 1907 and in the driest rain year from July 1975 to June 1976. The most precipitation in one month was in March 1907, and the most in 24 hours on January 31, 1897.