Synonyms for Equable (same or very similar meaning)
WordNet sense 1 ((of weather or climate) free from extremes; mild; or characteristic of such weather or climate):
temperateWordNet sense 2 (not easily irritated):
even-tempered, good-tempered, placidWordNet sense 3 (having an easygoing and cheerful disposition):
good-naturedFrom the ODE community, based on WordNetadd/edit