Mexico
Mexico City sits at 2,240 meters elevation, which produces a climate available almost nowhere else: 25°C / 77°F and dry at noon, 13°C / 55°F and clear by 9pm, intense sun all day from the high altitude, and a daily 4pm thunderstorm during May-September that arrives and leaves within an hour. The dress problem is that you need three layers between morning coffee and dinner — base, midweight, light jacket — and they all have to fit one day-bag. Roma Norte and Condesa run a quiet-luxury European-influenced register; Centro and Coyoacán read more traditional. The altitude takes 24-48 hours to acclimate; expect breathlessness on the stairs in Bosque de Chapultepec.