China is a big country and the climate vary widely from place to place. Most of China is located in the north temperature zone which is characterized by a warm climate and clear division between different seasons. In winter most areas become cold and dry, in summer hot and rainy.

The best time to visit China is in April, May, September and October when climate is mild all around the country. You will be rewarded with both comfortable weather and breathtaking landscape.

What to wear in different seasons:
Spring (10-22°C) – Jackets, sports coats, suits, and long sleeve shirts are appropriate for this time of year.
Summer (22°C and up) –T-shirts, short sleeves, skirts, and sandals.
Autumn (10-22°C) – Take rain wear and travel shoes and some light woolen sweaters, jackets.
Winter (10°C and lower) – Overcoat, cotton clothes, hat, gloves, and padded shoes for particularly cold areas.

How about China Main-City Temperature?
City \ Month
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
NOV
DEC
Beijing
-5
-2.2
4.5
13.1
19.8
24
25.8
24.4
19.4
12.4
4.1
-2.7
Shenyang
-12
-8.4
0.1
9.3
16.9
21.5
24.6
23.5
17.2
9.4
0.0
-8.5
Shanghai
3.5
4.6
8.3
14.0
18.8
23.3
27.8
27.7
23.6
18.0
12.3
6.2
Zhengzhou
-0.3
2.2
7.8
14.9
21.0
26.2
27.3
25.8
20.9
15.1
7.8
1.7
Wuhan
3.0
5.0
10.0
16.1
21.3
25.7
28.8
28.3
23.3
17.5
11.1
5.4
Guangzhou
13.3
14.4
17.9
21.9
25.6
27.2
28.4
28.1
26.9
23.7
19.4
15.2
Sanya
17.2
18.2
21.6
24.9
27.4
28.1
28.4
27.7
26.8
24.8
21.8
18.7
Chengdu
5.5
7.5
12.1
17.0
20.9
23.7
25.6
25.1
21.2
16.8
11.9
7.3
Chongqing
7.2
8.9
13.2
18.0
21.8
24.3
27.8
28.0
22.8
18.2
13.3
8.6
Kunming
7.7
9.6
13.0
16.5
19.1
19.5
19.8
19.1
17.5
14.9
11.3
8.2
Lase
-2.2
1.0
4.4
8.3
12.3
15.3
15.1
14.3
12.7
8.3
2.3
-1.7
Xian
-1.0
2.1
8.1
14.1
19.1
25.2
26.6
25.5
19.4
13.7
6.6
0.7
Nanning
12.8
14.1
17.6
22.0
26.0
27.4
28.3
27.8
26.6
23.3
18.6
14.7