Stage 17 · 22 July 2026

Chambéry → Voiron

174.7 kmFlat

Observed conditions from the ERA5 reanalysis archive.

Observed heat snapshot

+1.4°Cvs the 1974-2023 average at this location (ERA5): 26.2°C

28.8°Cpeak in the race window

Moderate low-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

24.2°C'74–'83

26.0°C'84–'93

26.1°C'94–'03

26.7°C'04–'13

28.1°C'14–'23

-2°C50-yr avg+2°C

A day this hot (≥27.6°C, ERA5 at this location) occurred 30× in 1974-1983 vs. 82× in 2014-2023.

WBGT is an estimate — see methodology. Data as of 2026-08-01T22:34:19.398Z.