University of Cambridge

"For very large eruptions, such as Mount Pinatubo in 1991, the volume of volcanic aerosols is so large that it single-handedly causes global temperatures to drop."

https://www.cam.ac.uk/research/news/effect-of-volcanic-eruptions-significantly-underestimated-in-climate-projections

My wife was speculating that the massive Tonga eruption may have been the reason why California went from drought to flooding.  Also, so far this Summer has been unusually cold here.  I now that weather doesn't equal claimant, and that there are many variables that make the weather happen, but this one seems plausible to me.

Edit: There are articles that claim that the opposite of cooling would happen due to water entering the atmosphere from the Tonga eruption.  This article doesn't mention rain, but I could see how massive amounts of water in the atmosphere could seed more rain on the Western coast of North America.   It's obvious we don't quite understand this stuff yet.

Oddly, I was thinking about Krakatoa's aerosols just last night, then this article pops up in my feeds (just pondering, didn't search ...so add mind-reading to seo).  I erroneously thought it was the cause of the Year Without Summer.

1816 - The Year Without Summer (U.S. National Park Service)
https://www.nps.gov/articles/000/1816-the-year-without-summer.htm

Volcanic winter (chart) - Wikipedia
https://en.wikipedia.org/wiki/Volcanic_winter