Lyon logs 31 hot days a year to Rennes's 4 — Rennes wins by 27. Rennes also leads on frost days by 26.

Lyon runs about $2,243/mo for a balanced lifestyle against Rennes's $2,136/mo — Rennes comes in $107 cheaper each month, roughly 5% less.

Lyon and Rennes score neck-and-neck on mobility (3.6 vs 3.6, 0–5 scale).

Lyon and Rennes score neck-and-neck on culture (3.6 vs 3.6, 0–5 scale).

Lyon and Rennes score neck-and-neck on nature & outdoors (3.8 vs 3.8, 0–5 scale).

Rennes's safety score is ~1.4× Lyon's — in the upper band, while Lyon lands in the middle of the scale, with the biggest gap on wildfire safety.

Rennes's career score of 3.4 sits well above Lyon's 3.2, with the biggest gap on startup ecosystem.

Lyon and Rennes score neck-and-neck on social & community (2.7 vs 2.7, 0–5 scale).

On food & dining, Rennes scores 3.2 vs Lyon's 3.0 (0–5 scale), with the biggest gap on brunch availability.

Lyon and Rennes score neck-and-neck on family (3.1 vs 3.1, 0–5 scale).

Lyon and Rennes score neck-and-neck on healthcare (3.0 vs 3.0, 0–5 scale).

Lyon averages 10.6 µg/m³ (moderate) PM2.5 annually versus Rennes's 8.3 µg/m³ (good) — Rennes breathes ~21% cleaner air (2.2 µg/m³ lower).

Who Thrives Here