Hot and cold have can't do much? Have ever heard the terms "warm front" and "cold front" are? Heck currently Tornados are belived to be caused by Cold air forcing warm air up. Trust me Nami can do leathal stuff with just hot, cold and wet. Plus a breeze dial is like a fan. She'd need jet to do any decent wind.
Maybe now the birds will have a line of axe dials running between them.