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Except this is our third La Nina year in a row, the first time that's ever happened:

What?

We had a triple dip in 1998, and before that 1976.

Also 1954-57.

That article only says it’s the first this century.

As long as you define century as 2000-2100, and not 1922-2022...

That is how "this century" would typically be understood

“This century” is fixed to start at 2000 until 2100, same as this decade is 2020–2029.

“Last hundred years” for the former interpretation.

Or 2001 until 2101, if you're being pedantic about the Nth century AD/CE.

(Because there is no year 0 in the AD/CE calendar, so the first century in the calendar starts in year 1, the second in 101, etc...)