Lyon logs 31 hot days a year to Rouen's 5 — Rouen wins by 26. Rouen also leads on frost days by 25.

Lyon runs about $2,243/mo for a balanced lifestyle against Rouen's $2,059/mo — Rouen comes in $184 cheaper each month, roughly 9% less.

On mobility, Lyon scores 3.6 vs Rouen's 2.6 (0–5 scale), with the biggest gap on airport accessibility. Rouen still holds an edge on car efficiency.

Lyon's culture score of 3.6 sits well above Rouen's 3.3, with the biggest gap on live music venues.

Lyon and Rouen score neck-and-neck on nature & outdoors (3.8 vs 3.7, 0–5 scale).

Rouen's safety score is ~1.3× Lyon's — in the upper band, while Lyon lands in the middle of the scale, with the biggest gap on walking safety. Lyon still holds an edge on flooding safety.

Lyon's career score of 3.2 sits well above Rouen's 2.8, with the biggest gap on economic scale.

Lyon and Rouen score neck-and-neck on social & community (2.7 vs 2.6, 0–5 scale).

On food & dining, Lyon scores 3.0 vs Rouen's 2.4 (0–5 scale), with the biggest gap on restaurant variety.

On family, Lyon scores 3.1 vs Rouen's 2.5 (0–5 scale), with the biggest gap on international schools.

On healthcare, Rouen scores 3.7 vs Lyon's 3.0 (0–5 scale), with the biggest gap on public healthcare quality.

Lyon averages 10.6 µg/m³ (moderate) PM2.5 annually versus Rouen's 8.8 µg/m³ (good) — Rouen breathes ~16% cleaner air (1.7 µg/m³ lower).

Who Thrives Here