San Juan vs Ulaanbaatar: which is better, month by month

San Juan and Ulaanbaatar split the year 5–5 — San Juan wins November to March, Ulaanbaatar wins May to September, and they are within 3 points in April and October.

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.

San Juan

🇵🇷 Puerto Rico · tropical climate

Best month: January 77/100
Months won: 5 of 12

Ulaanbaatar

🇲🇳 Mongolia · arid climate

Best month: June 93/100
Months won: 5 of 12

San Juan vs Ulaanbaatar — all 12 months

Month	San Juan	Ulaanbaatar	Winner	Gap
January	77Bhot, a little rain, clean air	32Ffreezing, dry	San Juan	45
February	75Bhot, a little rain, clean air	35Ffreezing, dry	San Juan	40
March	77Bhot, a little rain, clean air	53Dfreezing, dry	San Juan	24
April	72Bhot, rainy, clean air	70Bcold, dry, clean air	Tie	2
May	70Bsweltering, rainy, clean air	81Acool, dry, clean air	Ulaanbaatar	11
June	70Bsweltering, a little rain, clean air	93Snice, a little rain, clean air	Ulaanbaatar	23
July	66Csweltering, rainy, clean air	90Swarm, a little rain, clean air	Ulaanbaatar	24
August	64Csweltering, rainy, clean air	87Anice, a little rain, clean air	Ulaanbaatar	23
September	61Csweltering, rainy, clean air	78Bcool, a little rain, clean air	Ulaanbaatar	17
October	63Csweltering, rainy, clean air	63Ccold, dry, clean air	Tie	0
November	64Csweltering, soaked, clean air	40Ffreezing, dry, reliable snow	San Juan	24
December	73Bhot, a little rain, clean air	29Ffreezing, dry, poor air quality	San Juan	44

A month is a tie when the two are within 3 points. The widest gap is January (77 vs 32). Tap a month for that month's temperature, rain, humidity and air quality side by side.