What does "time of year" mean?

A particular period in the year.

What is a synonym for "time of year"?

Common synonyms include: period, periodicity, season, seasonable, seasons.

noun

noun ·Rare ·Advanced level

Noun

1
A particular period in the year.
"It'll be freezing in Canada at this time of year."
2
one of the natural periods into which the year is divided by the equinoxes and solstices or atmospheric conditions wordnet

"It'll be freezing in Canada at this time of year."