Heat stress - Cities and FUAs — Mean population exposure to heat in Lorient
Lorient: Heat stress - Cities and FUAs — Mean population exposure to heat was 0.3533 Days per year in 2025. ◆ Volatile
Heat stress - Cities and FUAs — Mean population exposure to heat in Lorient, 1981–2025
Source: Organisation for Economic Co-operation and Development. Measured in Days per year.
Analysis
Lorient recorded 0.3533 Days per year for heat stress - cities and fuas — mean population exposure to heat in 2025. That is the highest value across all 45 years on record.
That represents a change of up 680.5% on the previous year and up 206.3% over five years.
Over the whole period, heat stress - cities and fuas — mean population exposure to heat in Lorient peaked at 0.3533 Days per year in 2025 and was at its lowest, 0 Days per year, in 1982.
Lorient ranks 1238th of 1315 regions on this measure, in the bottom quarter.
The series is highly variable year to year, so single readings are best treated with caution.
Heat stress - Cities and FUAs — Mean population exposure to heat in Lorient, year by year
| Year | Days per year | Change |
|---|---|---|
| 1981 | 0.006 Days per year | — |
| 1982 | 0 Days per year | -100.0% |
| 1983 | 0.0882 Days per year | — |
| 1984 | 0.0062 Days per year | -93.0% |
| 1985 | 0 Days per year | -100.0% |
| 1986 | 0 Days per year | — |
| 1987 | 0.0064 Days per year | — |
| 1988 | 0 Days per year | -100.0% |
| 1989 | 0.09 Days per year | — |
| 1990 | 0.0969 Days per year | +7.7% |
| 1991 | 0 Days per year | -100.0% |
| 1992 | 0 Days per year | — |
| 1993 | 0.0068 Days per year | — |
| 1994 | 0 Days per year | -100.0% |
| 1995 | 0.2975 Days per year | — |
| 1996 | 0 Days per year | -100.0% |
| 1997 | 0.0407 Days per year | — |
| 1998 | 0.0071 Days per year | -82.7% |
| 1999 | 0 Days per year | -100.0% |
| 2000 | 0 Days per year | — |
| 2001 | 0.0967 Days per year | — |
| 2002 | 0 Days per year | -100.0% |
| 2003 | 0.3448 Days per year | — |
| 2004 | 0.0029 Days per year | -99.2% |
| 2005 | 0.0991 Days per year | +3304.7% |
| 2006 | 0.3084 Days per year | +211.3% |
| 2007 | 0 Days per year | -100.0% |
| 2008 | 0 Days per year | — |
| 2009 | 0 Days per year | — |
| 2010 | 0.0094 Days per year | — |
| 2011 | 0 Days per year | -100.0% |
| 2012 | 0 Days per year | — |
| 2013 | 0.0437 Days per year | — |
| 2014 | 0.0082 Days per year | -81.3% |
| 2015 | 0 Days per year | -100.0% |
| 2016 | 0.1052 Days per year | — |
| 2017 | 0.3116 Days per year | +196.1% |
| 2018 | 0.1145 Days per year | -63.3% |
| 2019 | 0.1063 Days per year | -7.1% |
| 2020 | 0.1154 Days per year | +8.5% |
| 2021 | 0.0088 Days per year | -92.4% |
| 2022 | 0.3507 Days per year | +3883.7% |
| 2023 | 0.1081 Days per year | -69.2% |
| 2024 | 0.0453 Days per year | -58.1% |
| 2025 | 0.3533 Days per year | +680.5% |
Averages by decade
| Decade | Average | Lowest | Highest | Years |
|---|---|---|---|---|
| 1980s | 0.0219 Days per year | 0 Days per year | 0.09 Days per year | 9 |
| 1990s | 0.0449 Days per year | 0 Days per year | 0.2975 Days per year | 10 |
| 2000s | 0.0852 Days per year | 0 Days per year | 0.3448 Days per year | 10 |
| 2010s | 0.0699 Days per year | 0 Days per year | 0.3116 Days per year | 10 |
| 2020s | 0.1636 Days per year | 0.0088 Days per year | 0.3533 Days per year | 6 |
More population data for Lorient
- Population by age and sex - Cities and FUAs 81,390 Persons (2022)
- Population by citizenship - Cities and FUAs 7.4 Percentage of population (2022)
- Foreign-born population - Cities and FUAs 8.3 Percentage of population (2022)
- Population and built-up density - Cities and FUAs — Urbanised area 7 Square kilometres (2030)
Frequently asked questions
- What is heat stress - cities and fuas — mean population exposure to heat in Lorient?
- Heat stress - cities and fuas — mean population exposure to heat in Lorient was 0.3533 Days per year in 2025, according to Organisation for Economic Co-operation and Development.
- What is the highest heat stress - cities and fuas — mean population exposure to heat recorded in Lorient?
- The highest recorded value was 0.3533 Days per year in 2025.
- What is the lowest heat stress - cities and fuas — mean population exposure to heat recorded in Lorient?
- The lowest recorded value was 0 Days per year in 1982.
- How does Lorient rank for heat stress - cities and fuas — mean population exposure to heat?
- Lorient ranks 1238th out of 1315 regions with data for 2025.
- Where does this Lorient data come from?
- The figures come from Organisation for Economic Co-operation and Development, published as part of Heat stress - Cities and FUAs — Mean population exposure to heat stress. Statizoid updates them automatically from the source API.
Download this data
CSV · JSON — 45 observations, free to reuse under OECD Terms and Conditions (attribution required).
About this data
This dataset provides an indicator of population exposure to heat stress. Data sources and methodology The indicator uses the Universal Thermal Comfort Index (UTCI). The UTCI enables to assess the impact of atmospheric conditions on the human body by considering air temperature, wind, radiation and humidity. UTCI values from 32°C to 38°C are considered as strong heat stress, from 38°C to 46°C as very strong heat stress, and above 46°C as extreme heat stress. Population exposure to heat stress was computed using the hourly thermal comfort indices grids from the Copernicus Climate Data Store (Di Napoli C. et al.). For each 0.25° by 0.25° grid cell, the number of days for which the maximum UTCI value is above each heat stress threshold (32°C, 38°C and 46°C) is computed. FUA and city level indicators correspond to the population-weighted average number of days above each heat stress threshold, obtained by intersecting the computed grid with the Global Human Settlement Population layer (European Commission, GHSL Data Package 2023). These estimates may differ from official subnational climate statistics due to differences in methodological approaches, such as the use of reanalysis based top down modelling versus in situ observations, along with variations in input data sources, spatial resolution, and the models and algorithms used to generate temperature estimates. Defining FUAs and cities The OECD, in cooperation with the EU, has developed a harmonised definition of functional urban areas (FUAs) to capture the economic and functional reach of cities based on daily commuting patterns (OECD, 2012). FUAs consist of: A city – defined by urban centres in the degree of urbanisation, adapted to the closest local administrative units to define a city. A commuting zone – including all local areas where at least 15% of employed residents work in the city. The delineation process includes: Assigning municipalities surrounded by a single FUA to that FUA. Excluding non-contiguous municipalities. The correspondence table between SAUs and FUAs/cities is available in parquet and csv format. The definition identifies 1 272 FUAs and 1 269 cities in all OECD member countries except Costa Rica and three accession countries. Cite this dataset OECD Regions, cities and local areas database (Heat stress - Cities and FUAs), http://oe.cd/geostats Further information OECD Local Data Portal OECD Regions and Cities at a Glance For questions and/or comments, please email CitiesStat@oecd.org