Now that it's almost summer time and warm outside I wash my hair everyday. I feel sweaty and gross if I don't. But in the winter I wash every other day. If I was my hair everyday in the winter it's awful to get static.
It depends on how long or short your hair is and how greasy it becomes. I wash my hair every two days as the first day it does not look that good. If my hair were shorter (it is shoulder length) I would have to wash it every day.