winter
Winter is the season between autumn and spring. In winter, the weather is cold.
A lot of plants and wild animals died during the harsh winter.
It was a dark winter's night.
If you want to say that something happens every year during this season, you say that it happens in winter or in the winter.
The park closes earlier in winter.
In the winter the path can be icy.
Be careful
Don't say that something happens ‘in the winters’ or ‘in winters’.
Don't say that something happens ‘in the winters’ or ‘in winters’.