Every winter; each winter (used to indicate something that happens each winter).
毎冬、家族で温泉旅行に行くのが習慣だ。
Every winter, it's our custom to go on a hot-spring trip with the family.
この地域は毎冬、雪で交通が乱れる。
In this region, traffic is disrupted by snow every winter.
毎冬の光熱費が厳しくて節約を考えている。
Heating and utility costs every winter are severe, so I'm thinking about saving.