hi,
I live in Quebec (CANADA) and i have to say that the weather isn't doing us any favor. The main problem comes from the fact that we don't have a really constant temperture. For example, yesterday the weather was at 7 degrees Celcius and today, we're having a snow storm and it's around -16 degrees celcius!!! Alot of times, my skin face just cracks because of the weather even if it's well moisturised (yep the kind of cold that would make your teeth hurt if u dare to breathe through the mouth...). When that happen, i can only imagine what damage the cold is doing to my hair.
The only thing I found was kind of helping was DCing 3 times per week + moisturise and seal wilt olive oil morning and night+ make sure that my hair is COMPLETELY DRY before I go out there. The weather is the main reason why I get easily discouraged with growing out my hair. Even my own hairstylist told me that the weather is what's holding us of retaining as much lenght as we could. I just do the best I can. My hair does grow but really slow and I noticed that my ends are healthier ever since I switched to olive oil.