我没习惯：I have not accustomed (myself to the weather). 我还没习惯： I have not accustomed (myself to the weather), yet.

Don't worry. The sentence itself is literally correct ! Although to answer "还没习惯" sounds more natural.

Yes,you can use 没 by 习惯.But you could use 还没 by 习惯，this tone will be friendly.

句子是没错的，但语气不友好。一般只回答，“没有”，“还没”，“还没有”，“没有呢”，“还没呢”等等，而回答“我没习惯”觉得很生硬。

对，这句话十分简单。习惯一种天气，需要过程，了表示有了过程，已经习惯。回答意味着，经过尝试，确实不能适应