[Crawford]

True, but perhaps misleading, as a lot of those high altitude Latin American cities have low mean/median temps bc of plummeting night temps.

But since people generally aren't out at 3 AM, they aren't experienced as cold cities. Mexico City has massive evening to mid-morning swings year-round, Bogota would be even more extreme. Glasgow wouldn't. Just bc Mexico City is 50-60 F 1/3 of the time, there's no point to jackets for most, given you're generally sleeping.