This project will investigate the co-occurrence of extreme heatwaves, coldwaves, precipitation and wind events across the Northern Hemisphere using ERA5 reanalysis data and CMIP6 models. Individually, these extreme events can cause sever disruption, loss of life and damage to infrastructure costing billions of Euros. When these events occur simultaneously, they can often result in larger impacts than the sum of their individual components. We will determine how well these links are represented in CMIP6 models compared to reanalysis and investigate potential changes in frequency, duration, magnitude and area under different warming scenarios.