Name all States of the USA and Australia + European Countries that have the biggest surface of non-hostile climates.
Hostile climates are considered as the following ones: Dry (BWh, BWk, BSh, BSk) and ones with cold winters and summers (Dsc, Dsd, Dwc, Dwd, Dfc, Dfd, ET, EF)
Habitable climates are considered as the following ones:
Tropical (Af, Am, Aw, As), Temperate (Cfa, Cfb, Cfc, Csa, Csb, Csc, Cwa, Cwb, Cwc) and Continental with warm/hot summers and enough rainfall (Dfa, Dfb, Dsa, Dsb, Dwa, Dwb)
the surface areas of each individual climate zone were calculated with GIMP as percentages on climate maps
The definition of hostile and habitable climates is completly based on my opinion and may differ from yours.