French · Pronunciation Guide
lee-VEHR — the "h" is silent, the article fuses on, and the final "r" is pronounced.
l'hi-VER, weight on the second syllable. The final "r" is the audible feature — compare it with -er verbs, where the same letters are silent.
Listen: l'hiver (m.)
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En hiver, il fait très froid.
In winter it's very cold.
Listen: En hiver, il fait très froid.
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"En hiver, il fait très froid" links "en" into the mute "h": /ɑ̃.n‿i.vɛʁ/, with the nasal releasing into a real "n". "Il fait froid" is the weather construction with "faire", and "très froid" makes no liaison since "froid" begins with a consonant. "Froid" is one beat ending in open air.
Learners aspirate the "h", producing "luh-HEE-ver" with a break. There is none. They also silence the final "r" by analogy with -er infinitives, which does not apply here. And the English word "hibernate" makes people expect a "h" sound — French "h" is always silent, without exception.