Normal yearly water year rainfall for Santa Rosa, CA is 36.23 inches. Season starts October 1 and ends September 30. At this reporting station we were +14.87 inches ahead for the 2016-2017 water year. -6.43 inches behind for the 2017-2018 water year, and +7.47 inches ahead for the 2018-2019 water year. The average rainfall water year for December 8, 2021 is 6.60 inches. Current rainfall water year for this station is 12.05 inches. This station had 12.74 inches for the 2020-2021 and 18.13 inches in the 2019 - 2020 rainfall water year. In 2016 - 2017 water year we had 51.96 inches of rain. This station had 29.90 inches of rain in the 2017-2018 water year. For the 2018-2019 water year this station had 43.70 inches. Total rainfall at this station for the 2021-2022 rainfall season is 9.51 The difference water season and rainfall season. A water year is defined by hydrologists as the 12-month period that starts Oct. 1 and continues through Sept. 30 the following year. A rainfall year season is defined as the 12-month period beginning July 1 that continues through June 30 of the subsequent year.

Top 5 wettest years in Santa Rosa since 1888.

1. 2016-2017 60.40 inches

2. 1889-1890 56.07 inches

3. 1982-1983 55.66 inches

4. 1940-1941 52.15 inches

5. 1981-1982 47.70 inches