Tropical nights around the world

• Nights in a year when the temperature stays above 20 °C, averaged over the country.
• Source: World Bank Climate Change Knowledge Portal, CMIP6 multi-model median.
• The dashed line is the CMIP6 model median (SSP2-4.5, middle of the road), a scenario rather than a forecast; the band is its models’ 10th–90th percentile.
• Climate model values are the median of the CMIP6 models, run on past emissions to 2014 and on SSP2-4.5, a middle-of-the-road path, after: they are not measurements.
• The chart shows the 5 most populous countries with figures; the table ranks every country by its own latest year.

How the layers work, where their data comes from and what they can’t tell you: Countries through time