The monsoon climate in China can easily bring all kinds of disastrous weather. From the autumn of 2009 to the spring of 20 12, Yunnan, Guangxi, Guizhou and other places in southwest China suffered onc

The monsoon climate in China can easily bring all kinds of disastrous weather. From the autumn of 2009 to the spring of 20 12, Yunnan, Guangxi, Guizhou and other places in southwest China suffered once in a century. Yunnan province is located in the southwest of China, which mainly belongs to subtropical monsoon climate, so A is wrong;

The precipitation in Yunnan Province changes greatly every year. Affected by the southwest monsoon, floods often occur, so B is wrong.

Yunnan province has more precipitation in summer, less precipitation in winter and great interannual variation of precipitation, so C is correct;

Yunnan belongs to subtropical monsoon climate and tropical monsoon climate, and the seasonal variation is not obvious, so the temperature annual range is small, so D is wrong.

So choose: C.