EGU26-9170, updated on 14 Mar 2026
https://doi.org/10.5194/egusphere-egu26-9170
EGU General Assembly 2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Oral | Thursday, 07 May, 14:40–14:50 (CEST)
 
Room 2.17
  Daytime and Nighttime Heat Exposure and Mortality: A Multicountry Analysis Using Hourly Temperature Data
Dominic Royé1, Valentina Chiminazzo2, Aurelio Tobías3, Carmen Iñiguez2, and the MCC Collaborative Research Network*
Dominic Royé et al.
  • 1Biological Mision of Galicia (MBG) – Spanish Council for Scientific Research (CSIC), Spain
  • 2Department of Statistics and Computational Research. Universitat de València, València, Spain
  • 3Institute of Environmental Assessment and Water Research (IDAEA), Spanish Council for Scientific Research (CSIC), Barcelona, Spain
  • *A full list of authors appears at the end of the abstract
The increase in extreme temperatures during both day and night poses a growing challenge for public health under climate change. While recent research has advanced understanding of the impact of hot nights, daytime heat represents an equally critical component that can intensify cumulative thermal stress and mortality risk. This study examines the association between excess and duration of heat during daylight hours and mortality in the warm season across multiple global locations, while also considering how these daytime metrics interact with nighttime conditions. Using time-series models and meta-analytic approaches, we explore whether greater excess and longer duration of daytime heat are linked to higher mortality, complementing evidence on the specific role of hot nights. Furthermore, the relative contribution of daytime versus nighttime heat remains an open question, and addressing this gap is essential for developing integrated adaptation and prevention strategies against heat-related health impacts.

 

MCC Collaborative Research Network:

Francesco Sera and Masahiro Hashizume and Yasushi Honda and Ho Kim and Ana Maria Vicedo-Cabrera and Shilu Tong and Eric Lavigne and Jan Kyselý and Mathilde Pascal and Francesca de’Donato and Susana das Neves Pereira da Silva and Joana Madureira and Veronika Huber and Aleš Urban and Joel Schwartz and Michelle L. Bell and Ben Armstrong and Carmen Iñiguez and Rosana Abrutzky and Micheline de Sousa Zanotti Stagliorio Coelho and Paulo Hilario {Nascimento Saldiva} and Patricia Matus Correa and Nicolás Valdés Ortega and Haidong Kan and Samuel Osorio and Antonio Gasparrini and Souzana Achilleos and Hans Orru and Ene Indermitte and Niilo Ryti and Alexandra Schneider and Klea Katsouyanni and Antonis Analitis and Fatemeh Mayvaneh and Alireza Enteyari and Raanan Raz and Paola Michelozzi and Yoonhee Kim and Barrak Alahmad and John Paul Cauchi and Magali Hurtado Diaz and Eunice Elizabeth Félix Arellano and Ala Overcenco and Jochem O. Klompmaker and Gabriel Carrasco and Xerxes Seposo and Paul Lester Carlos Chua and Iulian-Horia Holobaca and Yuming Guo and Jouni J.K. Jaakkola and Noah Scovronick and Fiorella Acquaotta and Whanhee Lee and Bertil Forsberg and Martina S. Ragettli and Shanshan Li and Antonella Zanobetti and Valentina Colistro and Tran Ngoc Dang and Do Van Dung

How to cite: Royé, D., Chiminazzo, V., Tobías, A., and Iñiguez, C. and the MCC Collaborative Research Network:   Daytime and Nighttime Heat Exposure and Mortality: A Multicountry Analysis Using Hourly Temperature Data, EGU General Assembly 2026, Vienna, Austria, 3–8 May 2026, EGU26-9170, https://doi.org/10.5194/egusphere-egu26-9170, 2026.