The characteristics of autumn and winter temperatures in Huanggang are as follows

From the temperature curve and precipitation histogram, it can be seen that A is a typical Mediterranean climate, with high temperature and little rain in summer and mild and rainy in winter, which is mainly distributed on the west coast of the mainland at 30-40 north latitude, so A is incorrect;

B It is hot and rainy all year round, with a tropical rain forest climate and rainy all year round, so B is correct;

C is hot and rainy in summer and cold and dry in winter, which belongs to temperate monsoon climate, so C is correct;

D belongs to subtropical monsoon climate, with hot and rainy summer and mild and rainy winter. Mainly distributed in China, southeastern United States and southeastern South America, so D is correct.

So choose: a.