Climate
Puerto Iguazú logs 141 hot days a year to Rosario's 67 — Rosario wins by 74. Puerto Iguazú also leads on frost days by 6.
Puerto Iguazú
Feels-like °C
Dinner outside
Rosario
Feels-like °C
Dinner outside
Air Quality
Puerto Iguazú averages 12 µg/m³ (moderate) PM2.5 annually versus Rosario's 12.6 µg/m³ (moderate) — Puerto Iguazú breathes ~5% cleaner air (0.6 µg/m³ lower).
Puerto Iguazú
Rosario
PM2.5 annual average
WHO classification
City Scale
Both maps at the same real-world scale — 1 cm on either map is the same distance.
Puerto Iguazú (55K) and Rosario (1.2M) are 22x in population — Rosario is the larger metro, Puerto Iguazú the smaller; on land area Rosario spans roughly 17x more ground.
Rosario is roughly 19x the scale of Puerto Iguazú
Combined population & area comparison
RosarioPuerto IguazúCity Scale Rankings
Rosario1.2M22xPuerto Iguazú55K1xRosario199 km²17xPuerto Iguazú12 km²1xPuerto Iguazú
Rosario
Who Thrives Here
Both cities work well for the winter escapist.
Also compared
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Berlin 
MiamiFrequently asked about Puerto Iguazú vs Rosario
▶How does the climate compare between Puerto Iguazú and Rosario?
▶Should I move to Puerto Iguazú or Rosario?
The best city depends on what matters to you
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