From Proto-Italic *hiem-, from Proto-Indo-European *ǵʰéyōm or similar. Cognate with Ancient Greek χιών (khiṓn, “snow”), χεῖμα (kheîma, “winter, storm”), χειμών (kheimṓn, “winter, storm”), Persian زمستان (zemestân), Albanian dimër, Welsh gaeaf, Sanskrit हिम (himá), Hittite 𒄀𒈠𒀭 (gi-ma-an /giman/), Armenian ձմեռ (jmeṙ), and Proto-Slavic *zima.
Practice speaking and memorizing "hiems" and many other words and sentences in Latin.