Bees need to keep their central hive core at around 95 degrees. Here in Southern California, in the winter months (December-February) it can get up to 70 degrees mid-day but plummet to the low 40's overnight. And we can get wind gusts in excess of 20-30 mph. We live in an urban environment and keep our hives on the perimeter of our backyard. Our house is on a hill and the logical direction for the hive opening is out toward the open space, facing away from our house and looking downhill. Unfortunately that placement sometimes exposes the entrance toward the oncoming wind.
So what I've decided to do is attach a half entrance reducer to help mitigate the wind, and also support less temperature variance. I've also replaced the Mann Lake polymer "Ultimate" hive covers with the aluminum covered telescoping wood covers (my hives all have wooden inner covers all year round). I believe the more sturdy alum/wood covers will better insulate so the bees don't have to work as hard. Reinforcing my decision was an event last month where the wind was so strong it literally blew off the polymer cover of one of the hives (yes, I even had a brick on it, but once the wind gets underneath, it becomes a sail).
It stands to mention I played a bit with SBB (screened bottom boards) over the summer months, but I do not use them in the colder months and uncertain as to if I will continue with them going forward (that could be a separate post).