Three of five k-means-identified summertime weather regimes have statistically significant occurrence trends since 1980: cyclonic Northern European conditions (WR1) and the Atlantic-anticyclonic/southeastern-European-cyclonic bipolar pattern (WR2) decrease, while Mediterranean and Central European anticyclonic conditions (WR3) increase.

Evidence (1)

European summer drying largely driven by atmospheric circulation changes since the 1980s — Weather-regime changes as mechanisms of circulation-driven drying

identifying three weather regimes with statistically significant trends since 1980

https://doi.org/10.1038/s41561-026-02050-w#unit-4-p1

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