Lancet Countdown on Health and Climate Change (led by University College London)

Lancet Countdown 2025: heat-related deaths, work hours lost to heat and heatwave exposure

Indicator data behind the 2025 report of the Lancet Countdown on health and climate change. Indicator 1.1.5: deaths attributable to heat (number and share of all deaths), 1990 to 2021, for the world, WHO regions, Lancet Countdown regions and Human Development Index groups, with no country values. Indicator 1.1.3: potential work hours lost to heat, in total and for services, manufacturing, agriculture and construction, 1990 to 2024, for the world, regions, HDI groups and 219 countries. Indicator 1.1.1, two workbooks: heatwave days per person observed in 2020 to 2024 compared with a modelled climate without human-caused warming, for the world and 220 countries; and heatwave days experienced by infants and people over 65, 1980 to 2024. Heat mortality is modelled, not counted.

Non-commercial reuse with creditactiveFetched automatically

Numbers published from it

Licence and credit

Licence: CC BY-NC-SA 4.0
What the terms say: “Lancet Countdown data, and associated data visualisations, are provided at no-cost under a Creative Commons Attribution-Non Commercial-Share Alike Licence (CC BY-NC-SA 4.0).”
From the producer's terms, checked 2026-10-04; re-checked automatically every week.
Credit we give: Lancet Countdown on Health and Climate Change, 2025 report data: indicator 1.1.1 by A. J. Pershing and J. Giguere (attributable heatwave days) and by F. Tartarini and O. Jay (vulnerable populations); indicator 1.1.3 by C. Freyberg, B. Lemke and M. Otto; indicator 1.1.5 by J. Ballester, X. Basagaña and J. Ruiz-Cabrejos. Romanello et al., The Lancet, 2025, doi:10.1016/S0140-6736(25)01919-1. CC BY-NC-SA 4.0.
Notice: Licensed CC BY-NC-SA 4.0 (https://creativecommons.org/licenses/by-nc-sa/4.0/): non-commercial use only, and anything built from these figures must be shared under the same licence. These indicators are computed from ERA5 and contain modified Copernicus Climate Change Service information {year}; neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.
Copy of the raw file: Allowed: we keep a public copy of every version we use.
Cite as: Romanello M, Walawender M, Hsu S-C, et al. The 2025 report of the Lancet Countdown on health and climate change. Lancet 2025; published online Oct 29. https://doi.org/10.1016/S0140-6736(25)01919-1.

Files

Indicator 1.1.5, heat-related mortality: sheets DATA GUIDANCE, Global, WHO, LC and HDI with Year, AF (percent of deaths attributable to heat) and AN (deaths attributable to heat), 1990-2021. No country sheet.
https://lancetcountdown.org/wp-content/uploads/2025/10/Indicator-1.1.5_Data-Download_2025-Lancet-Countdown-Report-1.xlsx
Indicator 1.1.3, potential work hours lost: sheets Country, Global, WHO and HDI, 1990-2024. Hours lost by sector (WHL200Serv, WHL300Manuf, WHL400sunAgr, WHL400sunConstr) and in total (TotalSunAgCon), in thousands of hours, plus hours lost per worker (TotalSunWHLpp).
https://lancetcountdown.org/wp-content/uploads/2025/10/Indicator-1.1.3_PWHL_Data-Download_2025-Lancet-Countdown-Report_v2-1.xlsx
Indicator 1.1.1, heatwave days per person: Observed, Counterfactual (without human-caused warming) and Attributable_to_CC, for each year 2020-2024, on a country sheet and a global sheet.
https://lancetcountdown.org/wp-content/uploads/2025/10/Indicator-1.1.1_Attributable_Data-Download_2025-Lancet-Countdown-Report-1.xlsx
Indicator 1.1.1, heatwave exposure of infants under 1 and adults over 65: total person-days and average days per person, 1980-2024, on Country, Global, WHO, LC and HDI sheets (the Global sheet also has over-75s).
https://lancetcountdown.org/wp-content/uploads/2025/10/Indicator-1.1.1_Vulnerable_Data-Download_2025-Lancet-Countdown-Report-1.xlsx

Status

Programme: The 2025 workbooks were posted on 30 October 2025, the day after the report. The 2026 report is the next vintage and replaces these files under new names. Not a US federal product.
Updates: Annual global report in late October, with the indicator workbooks posted the same week
Next release: 2026-10-28: The 10th (2026) global report launches at the Health and Climate Change Conference on 28 October 2026; its indicator workbooks will have new file names.
Last check: Unchanged since the last fetch (2026-10-05T11:04:10Z)