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The Nights That No Longer Cool

Tropical nights — when the "feels-like" temperature never falls below 20 °C, and the body gets no chance to recover. Pick a layer, swap the projection, recentre on any meridian, and click any pixel for its count. See the daytime heat map

World map of tropical nights — nocturnal heat stress

An interactive world map of tropical nights (nocturnal heat stress): present-day, the 1970s, and the change between them — tap to explore it.

Interactive map · loads ~0.6 MB on mobile

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Data: ERA5-HEAT — thermal-comfort indices derived from ERA5 (tropical-nights yearly statistics), Copernicus Climate Change Service (C3S) / ECMWF, CDS derived-utci-historical. Generated using Copernicus Climate Change Service information (2026).

Framing and the present-vs-1970s comparison follow Emerton, Nicolas, Lombardi & Di Napoli (2026), “Global heat stress intensification and its expanding footprint on the human population,” Nature Climate Change, doi:10.1038/s41558-026-02670-5.