Brussels vs Rotterdam: which is better, month by month

Brussels beats Rotterdam in 2 of 12 months — its lead peaks in September (86 vs 82) — and they are within 3 points in the other 10 months.

Each place is scored under the lens that suits its type. Comfort is SeasonMap's 0–100 estimate from ERA5 climate normals, not a forecast.

Brussels

🇧🇪 Belgium · mild climate

Best month: July 94/100
Months won: 2 of 12

Rotterdam

🇳🇱 Netherlands · mild climate

Best month: August 93/100
Months won: 0 of 12

Brussels vs Rotterdam — all 12 months

Month	Brussels	Rotterdam	Winner	Gap
January	49Fcold, rainy, clean air	49Fcold, rainy, clean air	Tie	0
February	59Dcold, a little rain, clean air	59Dcold, a little rain, clean air	Tie	0
March	68Ccold, a little rain, clean air	68Ccold, a little rain, clean air	Tie	0
April	79Bcool, a little rain, clean air	77Bcool, a little rain, clean air	Tie	2
May	84Anice, a little rain, clean air	84Anice, a little rain	Tie	0
June	90Snice, a little rain	89Anice, a little rain	Tie	1
July	94Swarm, a little rain, clean air	91Snice, a little rain, clean air	Tie	3
August	92Swarm, a little rain, clean air	93Snice, a little rain, clean air	Tie	1
September	86Anice, a little rain, clean air	82Anice, rainy, clean air	Brussels	4
October	72Bcool, a little rain, clean air	70Bcool, rainy, clean air	Tie	2
November	61Ccold, a little rain, clean air	57Dcold, rainy, clean air	Brussels	4
December	53Dcold, a little rain, clean air	52Dcold, a little rain, clean air	Tie	1

A month is a tie when the two are within 3 points. The widest gap is September (86 vs 82). Tap a month for that month's temperature, rain, humidity and air quality side by side.