What would weather be like in April for cities Shanghai,Chongqing, Xian, Guilin and Hong Kong?

Shanghai: The average temperature then is about 15 C. Sometimes light rain happens, but will not disturb your trip. You can take along long-sleeved shirts, thin coats.
Chongqing: During that time, the average temperature could be about 14 C. Frequent rain may bother you a little, but it would not rain heavily. And the cloudy days are more tahn the sunny days then.
Xi'an: In April of Xian, the weather is the same as that of Shanghai.
Guilin: The average temperature is about 18 C. In April, it rains a lot, light or heavy. So you'd better take along rainy wear or an umbrella as you are outing.
Hong Kong: It seems to be warm and humid then. The average temperature is 18-25 C. As it turns a little bit cold at night, you need take along long-sleeved shirt. Beside, an umbrella is a must because it may rain suddenly.