HI! I am going to china (beijing-xian-luyoang) next year for 16 days. I am stuck between July and the last 3 weeks of August. Cannot move my time because the kids are out of school only on these times. Can anyone give me an opinion as to which month to choose? which is better, slightly better, or desam. I looked at the weather averages in beijing on this site and cannot really make up my mind. Thanks everyone.