Compare the differences in temperature and precipitation between Ganzhou and Jiujiang, and explain the reasons

Ganzhou is located at the southern edge of the tropical monsoon zone than Jiujiang, and its precipitation and temperature are slightly higher than those of Jiujiang.

Ganzhou City is located in the southern part of Jiangxi Province in East China, between 24°29′~27°09′ north latitude and 113°54′~116°38′ east longitude. The southern edge of the central subtropical zone has a subtropical monsoon climate. The average annual temperature is 19.8℃. It has climatic characteristics such as prevailing winter and summer monsoons, concentrated precipitation in spring and summer, distinct four seasons, mild climate, abundant heat, abundant rainfall, short periods of intense heat and severe cold, and long frost-free periods. Ganzhou City is located in the upper reaches of the Gan River. The runoff supply of each river is mainly precipitation, which is a rainwater supply type. The average total precipitation ranges from 1318.9 mm to 1967 mm.

Jiujiang is located in the northernmost part of Jiangxi Province, between 28°47'~30°06' north latitude and 113°57'~116°53' east longitude. Jiujiang is located in the subtropical monsoon climate zone, with an annual average The temperature is 16-17℃, the annual rainfall is 1300-1600 mm, more than 40% of which is concentrated in the second quarter; the annual frost-free period is 239-266 days, and the annual average foggy days is less than 16 days. Jiujiang's spring picks up earlier, but the weather is changeable, sometimes warm and sometimes cold. From early summer to the plum rains in June and July, rainfall is concentrated and heavy and heavy rains are frequent. The annual average precipitation in May and June is about 200 millimeters, which is extremely high. It is easy to cause floods; after the plum blossoms, it is controlled by the subtropical high pressure, and the weather is often sunny, hot and dry. In many years, the high temperature days are above 35 degrees Celsius for more than 20 days; in autumn, the temperature is relatively mild and there is little rain; in winter, it is cold and frosty The period is short.