chilliest

ˈtʃɪli

adjective

uncomfortably or unpleasantly cold.

a chilly February evening

cold,cool,crisp,fresh,brisk,bleak,wintry,snowy,frosty,icy,ice-cold,icy-cold,glacial,polar,arctic,raw,sharp,bitter,bitterly cold,biting,piercing,penetrating,freezing,frigid,nippy,parky,Baltic,chill,gelid,brumal