Stage 3 · 3 August 2026

Genève → Poligny

156.5 kmHilly

Observed conditions from the ERA5 reanalysis archive.

Observed heat snapshot

+10.3°Cvs the 1974-2023 average at this location (ERA5): 24.8°C

35.1°Cpeak in the race window

High-risk · 32°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

23.9°C'74–'83

24.5°C'84–'93

25.7°C'94–'03

24.4°C'04–'13

25.7°C'14–'23

-2°C50-yr avg+2°C

A day this hot (≥35.1°C, ERA5 at this location) occurred 2× in 1974-1983 vs. 3× in 2014-2023.

WBGT is an estimate — see methodology. Data as of 2026-08-13T12:21:28.458Z.