Southerly winds prevail in Guilin in summer, with southeasterly and southwesterly winds. The southeasterly wind comes from the Pacific Ocean, and the southwesterly wind comes from the Indian Ocean. They are all warm and humid air currents, so the summer is hot and humid.

The northwest wind prevails in winter, coming from Siberia. When these dry and cold northwest airflows encounter the high-altitude South Branch jet stream, they form rainfall, but the rain is not heavy, so the winter is cold.

Spring and winter are the seasons where ambient air pollution occurs most frequently in Guilin. The reason is that Guilin is affected by downdrafts and other factors. There is little wind without rain. The meteorological conditions are not conducive to the dilution, diffusion and removal of air pollutants, which easily leads to the accumulation of pollutants near the ground. At the same time, Guilin is located at the northernmost end of the Hunan-Guangxi Corridor, and its terrain is a northwest-oriented corridor. The dominant wind direction is north-northeast wind all year round, making it susceptible to the transport of pollutants from upwind areas.

Notes:

Guilin City is located in the southwest of the Nanling Mountains. It has a mid- to low-mountain terrain with karst mountains, hills, and mesas. Guilin is a typical karst landform, with high sides and low center. It is located in a karst (karst) basin extending from northwest to southeast. The karst peak forest landform is a natural landscape tourism resource with world significance.

Guilin is located at low latitudes and has a mid-subtropical monsoon climate. The climate in the territory is mild, with abundant rainfall, a long frost-free period, sufficient sunlight, abundant heat, long summer and short winter, four distinct seasons with rain and heat basically in the same season, and the climate conditions are very superior. The average annual temperature is 18·9 C. August is the hottest month, with an average monthly temperature of 23 C, and January is the coldest, with an average monthly temperature of 15·6 C. The average annual frost-free period is 309 days, and the average annual rainfall is 1949·5 mm. The average evaporation volume is 1490~1905 mm.