No proof? Ok. The answer is, yes. El Nino and La Nina are part of a warmer then cooler cycle. I'm from California. Know about this very well.
Unfortunately, it's being influenced by climate change. Who would have guessed.
https://environment.uw.edu/news/2024/01/el-nino-shows-us-the-true-face-of-climate-change/
An important detail to note about El Niño and La Niña is that they are measured against a rolling average of sea-surface temperatures. That means that when researchers say the tropical Pacific is 2 degrees C warmer than normal, they mean 2 degrees C warmer than the average from 1991-2020 — a period that was already significantly warmer than pre-industrial times. The actual sea surface temperatures may well be record-setting, even if the El Niño event itself is not.
“If you look at a chart of global average surface temperatures over time, you’ll see a steady rise due to increasing greenhouse gas concentrations in the atmosphere, but then you see ups and downs every few years,” McPhaden said. “The ups are El Niño and the downs are La Niña.”