严寒期 meaning in English

freeze-up
frost

Damage related to extreme cold and navigation in ice occurs every year
严寒及冰海航行造成的损伤每年均有发生，严寒期开始时尤为频繁。
Amidst the mists and coldest frosts , with stoutest wrists and loudest boasts , he thrusts his fist against the posts and still insists he sees the ghosts
在满布薄雾，严寒期最冻的那天，他用最结实的手腕和最自夸的话用拳头猛力推打柱子，而且声称他见鬼。