If a climate is intemperate, its temperatures might be extreme. If a person is intemperate, his moods might be extreme. Being intemperate is all about avoiding moderation.
Intemperate is a combination of the prefix in- meaning "not" and the Latin temperantia meaning "moderation." When you are intemperate, you are not doing things in moderation; you lack self-control. It's often a word used when describing the tendency someone has to indulge excessively in liquor. An alcoholic is intemperate — overindulging and depending on alcohol.
adj excessive in behavior
possessing or displaying a distinctive feature to a heightened degree
beyond reasonable limits
not extreme in behavior
moderate in type or degree or effect or force; far from extreme
being within reasonable or average limits; not excessive or extreme
marked by temperance in indulgence
marked by avoidance of extravagance or extremes
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adj (of weather or climate) not mild; subject to extremes
(of weather or climate) severe