Is it ensure, insure, or assure?
late 14c., of persons, "modest, forbearing, self-restrained," from Latin temperatus "restrained, regulated," from past participle of temperare "to moderate, regulate" (see temper (v.)). Applied to climates mid-15c.; temperate zone is attested from 1550s. Related: Temperately; temperateness.
temperate tem·per·ate (těm'pər-ĭt, těm'prĭt)
Exercising moderation and self-restraint.