Wintriest

adjective

1. Suggestive or characteristic of winter; cold, stormy.

   "wintry weather"

2. Of precipitation, containing sleet or snow.

   "It will be cloudy overnight, with outbreaks of heavy rain at times. The rain may turn wintry over higher ground."

3. Aged, white-haired.
4. Chilling, cheerless.

   "a wintry remark"