During spring, a large part of the winds may originate from N and SSE In summer, due to the influence of maritime air mass, the privileged wind direction turns into SE The wind distributions during autumn and winter are somewhat similar, in which the North winds are generally dominative The seasonal hourly mean wind speeds are derived as 2.75 m/s for spring, 2.68 m/s for summer, 3.06 m/s for autumn and 3.56 m/s for winter It can be seen that the windiest season in Guangzhou is winter, whereas the wind condition in the summer is the mildest. A similar conclusion can be obtained from