Winter hair help!!!

So in august i moved from warm humid hawaii to seattle wa, so when i moved it was hot weather so my hair was just fine. But now its january winters in full force i mean frost and everything we are in the 40's thats freezing!!
Anywho so i need Hair care advice i have 3c bsl hair thats been chemacly treated once and ha been hennad several times, i have recently been experiancing some breakage (mostly when styling) and my hair just feels different judging by how dry my skin feels i know my hairs suffering too so basicly i just need winter hair care info, im growing my hair out so i dont want the weather change to be a setback. Also is it okay to wear my hair out during the winter? cuz buns r my go to style (like everyday for th last 3 years) and prob are doing more harm then good.