Stage 19 · 24 July 2026

Gap → Alpe d'Huez

127.9 kmMountain

Observed conditions from the ERA5 reanalysis archive.

Observed heat snapshot

+5.7°Cvs the 1974-2023 average at this location (ERA5): 17.9°C

28.7°Cpeak in the race window

Moderate high-risk · 23°C WBGT (est.)

Schematic — real elevation, approximate route between known points, not survey-accurate. Fill colored by temperature.

+10°C26°C+42°C

Decade trend — deviation from the 50-year mean at this location

16.5°C'74–'83

18.2°C'84–'93

17.9°C'94–'03

17.7°C'04–'13

19.3°C'14–'23

-2°C50-yr avg+2°C

A day this hot (≥23.6°C, ERA5 at this location) occurred 10× in 1974-1983 vs. 19× in 2014-2023.

WBGT is an estimate — see methodology. Data as of 2026-08-01T22:34:19.357Z.