Seasonality reversal of temperature attributable mortality projections due to previously unobserved extreme heat in Europe.

Competing Interests: MQ-Z, HA, DP, and JB acknowledge funding from the EU's Horizon 2020 research and innovation programme under grant agreement No 865564 (European Research Council Consolidator Grant EARLY-ADAPT). MQ-Z, EM-S, DP, and JB acknowledge funding from the EU's Horizon 2020 research and innovation programme under grant agreement No 727852 (project Blue-Action). HA acknowledges funding from the Secretariat for Universities and Research of the Ministry of Business and Knowledge of the Government of Catalonia (grant numbers B00391 [FI-2018], B100180 [FI-2019] and B200139 [FI-2020]). JB acknowledges funding from the EU's Horizon 2020 research and innovation programme under grant agreement No 956396 (project EDIPI), and from the Ministry of Science and Innovation under grant agreements RYC2018-025446-I (programme Ramón y Cajal) and EUR2019-103822 (project EURO-ADAPT). J-MR acknowledges funding from the EU Community Action Program for Public Health (grant agreement 2005114). ISGlobal recieves support from the Spanish Ministry of Science and Innovation through the Centro de Excelencia Severo Ochoa 2019-2023 Program (CEX2018-000806-S), and support from the Generalitat de Catalunya through the CERCA Program. All other authors declare no competing interests. We acknowledge the E-OBS dataset from the EU-FP6 project UERRA and the Copernicus Climate Change Service, and the data providers in the ECA&D project. For their roles in producing, coordinating, and making available the ISIMIP input data and impact model output we acknowledge the modelling groups, the ISIMIP sector coordinators, and the ISIMIP cross-sectoral science team for the health sector.