Stage 4 · 4 August 2026

Gevrey-Chambertin → Dijon

21 kmIndividual time trial

Observed conditions from the ERA5 reanalysis archive.

Observed heat snapshot

+6.6°Cvs the 1974-2023 average at this location (ERA5): 25.2°C

33.0°Cpeak in the race window

Moderate high-risk · 28°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

24.3°C'74–'83

24.9°C'84–'93

26.5°C'94–'03

24.4°C'04–'13

26.0°C'14–'23

-2°C50-yr avg+2°C

A day this hot (≥31.8°C, ERA5 at this location) occurred 2× in 1974-1983 vs. 19× in 2014-2023.

WBGT is an estimate — see methodology. Data as of 2026-08-13T12:21:29.412Z.