Definitions Catalina Water Year Rainfall Data Updated October 4, 2019 Art Rangno 5 Comments The “ENs” denote those winters with significant El Niñoes. The biggest of all, back in 2015-16, didn’t do much as far as SW weather goes. Generally, as you can see, they are very powerful “weather actuators” for us. Our poor summer rains kept this from being a truly spectacular water year. Still, over 20 inches is very good. Our bountiful September rains kept this summer from resembling one of those from the early and mid-90s.