2.in the depths of winter
3.at the time of bitter winter
5.It happened in the depth of winter.
6.At the time of bitter winter, plum blossoms defy frost and snow.
8.It occurred in the dead of winter when there was snow on the ground.
9.It was the middle of winter. Snow lay thick on the ground.
10.Behind us lay bitter memories of what midwinter was like.
