The period of summering advantages of Zhangjiakou is 3 months (June, July and August), the period of Chengde is 2 months (June and August), but that of Qinhuangdao is only the month (June).

• 张家口市夏季有三个月的避暑期（6、7、8月），承德市有二个月的避暑期（6、8月），秦皇岛市有1个月的避暑期（6月）。