characteristic of winter, esp. in feeling or looking very cold and bleak: "a wintry landscape".
summery: belonging to or characteristic of or occurring in summer; "summery weather";
What are the words that mean characteristic of spring and autumn, respectively? For example:
springlylandscape; an autumnlylandscape
What about American English, where one uses fall instead of autumn?
A great thing about English is its rich lexicon. These are the seasonal adjectives that come to mind:
Incidentally, two of the above also have verb forms: hibernate and estivate.