CountryBest November – March (Southern Hemisphere summer, for Patagonia specifically)
Chile
A ribbon of a country pinned between the Andes and the Pacific, ending in Patagonian wind.
Chile stretches over 4,000 kilometres north to south and barely 200 wide, so "when to go" depends entirely on which end of the country is meant — the desert north and the glacial south are effectively different climates. For Patagonia specifically, the window is the Southern Hemisphere summer, November through March.