What does "wintertime" mean?

The season of winter, between autumn and spring.

What is a synonym for "wintertime"?

Common synonyms include: winter, bleak, cold season, winter period, winter season, winter window.

noun

noun ·3 syllables ·Rare ·Advanced level

Noun

1
The season of winter, between autumn and spring. countable, uncountable
2
the coldest season of the year; in the Northern Hemisphere it extends from the winter solstice to the vernal equinox wordnet

"I always need an extra blanket in the wintertime."

From winter + time.