Temperatures ranges at Beijing and Shenyang and kinds of clothing to bring.

My two companions and I will be going to Shenyang, China this July 14, 2014 for a Factory Acceptance Test (FAT) of equipment before it will transported. We will have our stopover at BJ, China. What will be the temperature ranges during night time and day time at BJ and Shenyang? What kind of clothing to bring? Thank you.