It seems to be a thing of the past. Apparently around 2010 the 30 years calming trend reversed. Since then, wind speeds and wave heights are picking up quickly, possibly in a decadal variation pattern.
Young et. al. 2010 Global Trends in Wind Speed and Wave Height
Possible application for the planning of wind turbines:
Zhenzhong Zeng et.al. 2019 A reversal ...