Data
Heatwave days per person for adults over 65 and infants, world
Heatwave days that adults over 65 and infants under one year old were exposed to on average each year worldwide, 1980–2024, from the Lancet Countdown (indicator 1.1.1). These are heatwaves of any cause as observed in ERA5; the days are not attributed to climate change.
Latest value
20.8days
World, 2024. Version 2025 report.
Heatwave days per person for adults over 65 and infants, world (days per person)
Heatwave days per person for adults over 65 and infants, world (days per person)
Show as a table
| Period | Group | Value (days) | Status |
|---|---|---|---|
| 1980 | Adults over 65 | 2.8 | final |
| 1981 | Adults over 65 | 3.6 | final |
| 1982 | Adults over 65 | 2.5 | final |
| 1983 | Adults over 65 | 5.4 | final |
| 1984 | Adults over 65 | 2.5 | final |
| 1985 | Adults over 65 | 2.2 | final |
| 1986 | Adults over 65 | 2.4 | final |
| 1987 | Adults over 65 | 3.6 | final |
| 1988 | Adults over 65 | 5.6 | final |
| 1989 | Adults over 65 | 3.1 | final |
| 1990 | Adults over 65 | 3.6 | final |
| 1991 | Adults over 65 | 4.0 | final |
| 1992 | Adults over 65 | 3.7 | final |
| 1993 | Adults over 65 | 2.4 | final |
| 1994 | Adults over 65 | 7.6 | final |
| 1995 | Adults over 65 | 6.7 | final |
| 1996 | Adults over 65 | 3.2 | final |
| 1997 | Adults over 65 | 4.6 | final |
| 1998 | Adults over 65 | 10.9 | final |
| 1999 | Adults over 65 | 5.0 | final |
| 2000 | Adults over 65 | 4.1 | final |
| 2001 | Adults over 65 | 6.3 | final |
| 2002 | Adults over 65 | 6.6 | final |
| 2003 | Adults over 65 | 8.1 | final |
| 2004 | Adults over 65 | 4.5 | final |
| 2005 | Adults over 65 | 6.8 | final |
| 2006 | Adults over 65 | 8.4 | final |
| 2007 | Adults over 65 | 6.5 | final |
| 2008 | Adults over 65 | 4.2 | final |
| 2009 | Adults over 65 | 5.0 | final |
| 2010 | Adults over 65 | 13.6 | final |
| 2011 | Adults over 65 | 6.3 | final |
| 2012 | Adults over 65 | 9.4 | final |
| 2013 | Adults over 65 | 9.5 | final |
| 2014 | Adults over 65 | 6.5 | final |
| 2015 | Adults over 65 | 9.6 | final |
| 2016 | Adults over 65 | 12.1 | final |
| 2017 | Adults over 65 | 10.4 | final |
| 2018 | Adults over 65 | 10.7 | final |
| 2019 | Adults over 65 | 11.6 | final |
| 2020 | Adults over 65 | 9.3 | final |
| 2021 | Adults over 65 | 8.5 | final |
| 2022 | Adults over 65 | 12.7 | final |
| 2023 | Adults over 65 | 14.4 | final |
| 2024 | Adults over 65 | 20.8 | final |
| 1980 | Infants under 1 year old | 2.7 | final |
| 1981 | Infants under 1 year old | 2.7 | final |
| 1982 | Infants under 1 year old | 1.8 | final |
| 1983 | Infants under 1 year old | 4.6 | final |
| 1984 | Infants under 1 year old | 2.6 | final |
| 1985 | Infants under 1 year old | 2.0 | final |
| 1986 | Infants under 1 year old | 2.3 | final |
| 1987 | Infants under 1 year old | 3.8 | final |
| 1988 | Infants under 1 year old | 4.9 | final |
| 1989 | Infants under 1 year old | 2.4 | final |
| 1990 | Infants under 1 year old | 2.8 | final |
| 1991 | Infants under 1 year old | 3.1 | final |
| 1992 | Infants under 1 year old | 3.0 | final |
| 1993 | Infants under 1 year old | 2.3 | final |
| 1994 | Infants under 1 year old | 5.3 | final |
| 1995 | Infants under 1 year old | 5.5 | final |
| 1996 | Infants under 1 year old | 2.6 | final |
| 1997 | Infants under 1 year old | 3.4 | final |
| 1998 | Infants under 1 year old | 10.7 | final |
| 1999 | Infants under 1 year old | 3.5 | final |
| 2000 | Infants under 1 year old | 3.0 | final |
| 2001 | Infants under 1 year old | 3.8 | final |
| 2002 | Infants under 1 year old | 4.7 | final |
| 2003 | Infants under 1 year old | 6.0 | final |
| 2004 | Infants under 1 year old | 3.7 | final |
| 2005 | Infants under 1 year old | 7.0 | final |
| 2006 | Infants under 1 year old | 5.2 | final |
| 2007 | Infants under 1 year old | 4.9 | final |
| 2008 | Infants under 1 year old | 2.8 | final |
| 2009 | Infants under 1 year old | 4.7 | final |
| 2010 | Infants under 1 year old | 11.6 | final |
| 2011 | Infants under 1 year old | 4.4 | final |
| 2012 | Infants under 1 year old | 7.5 | final |
| 2013 | Infants under 1 year old | 6.6 | final |
| 2014 | Infants under 1 year old | 5.8 | final |
| 2015 | Infants under 1 year old | 8.5 | final |
| 2016 | Infants under 1 year old | 12.3 | final |
| 2017 | Infants under 1 year old | 9.0 | final |
| 2018 | Infants under 1 year old | 7.7 | final |
| 2019 | Infants under 1 year old | 11.3 | final |
| 2020 | Infants under 1 year old | 8.8 | final |
| 2021 | Infants under 1 year old | 7.4 | final |
| 2022 | Infants under 1 year old | 8.6 | final |
| 2023 | Infants under 1 year old | 12.3 | final |
| 2024 | Infants under 1 year old | 20.5 | final |
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; indicator 1.2.1 by R. Hänninen, M. Sofiev and R. Kouznetsov; indicator 1.2.2 by M. Romanello and M. Walawender; indicator 1.2.3 by K. Minor and N. Obradovich; indicator 3.2.1 by G. Kiesewetter and S. Zhang. Romanello et al., The Lancet, 2025, doi:10.1016/S0140-6736(25)01919-1. CC BY-NC-SA 4.0. CC BY-NC-SA 4.0.
Where it comes from
- Producer
- Lancet Countdown on Health and Climate Change (led by University College London) · Lancet Countdown 2025: heat, wildfire smoke, drought, extreme rain and deaths from air pollution
- Version
- 2025 report
- Fetched
- 2026-10-05 (automatically), 710,882 bytes
- Fingerprint
- sha256 a5b880ab56941f8a8db93b8412b47bb1d9415db8f138acf3d156445ec7b313a7ETag "ad8e2-6425ae093736c" · Last-Modified Thu, 30 Oct 2025 07:05:42 GMT
- Cite the producer
- 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.
What was done to it
Read the sheet '2025 Report Data_Global' of the indicator 1.1.1 (vulnerable populations) workbook of the Lancet Countdown 2025 report, 1980–2024: the average heatwave days per person of adults over 65 (exposure_average_65) and of infants under one year old (exposure_average_infants), in days as the guidance sheet states, published as in the workbook.
Code: pipeline/src/envdash/transforms/impacts/lancet_countdown.py · code sha256 fecaf0b937e79c60… · inputs a5b880ab5694…
Total person-days are not published. The over-75 columns are not published either: the guidance sheet's column table does not describe them, and they read 0 in every year before 2000, when the over-65 values do not.
Code: pipeline/src/envdash/transforms/impacts/lancet_countdown.py · code sha256 fecaf0b937e79c60… · inputs a5b880ab5694…
What it covers
- Geography
- World
- Basis
- A heatwave is at least two consecutive days when both minimum and maximum temperature exceed the local 1986–2005 95th percentile; the report's key finding compares each year with the 1986–2005 average. Each value is the group's heatwave person-days over its population, from ERA5 temperatures, hybrid gridded demographic data and WorldPop age structure. The producer warns that the two population sources may make values before and after 2000 inconsistent.
- Unit
- days per person (days)