We prefer going from mid April to mid June or mid September to the end of October, when the days are usually in the 70-80s F/20-32 C, with nights in the 50-60s F/10-20 C. July, August and the first half of September are generally quite hot high 90s F/34-37 C, humid and very crowded with tourists. The winters in the north are chilly -- 50s F/10-15 C or colder in the day and much colder at night.