What is the weather in Zhangjiajie in early April and what sort of clothing to bring?

It will get warm from April. The temperature may range from 10~18C. It is possible to have rain during that time, usually light rain. It may get cooler during the rainy days. You need to preapre some lightly clothes such as light sweaters or long-sleeved T-shirts with light jackets, and better prepare a piece of warm coat. A raincoat or an umbrella is also a must.