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I do not see that much of an upward trend, how did you notice it?

Here you go: https://imgur.com/a/fbt68er. I've removed the first and last year since they had incomplete data and did a simple linear regression. These are yearly totals from https://www.weatherbook.org/dash/3/totals

Undersampled Linear regressions are pretty sensitive to noise points on the ends. Looks like the 90s were lower than next 20 years.

They had "confirmation bias" affecting their perception

Confirmation of what? The belief that climate change is real?

I posted a linear regression in a neighbor comment.