The climate effect of large water body means that the water body effect changes from a warming effect at night to a weak cooling effect during the day at about10: 00, and then changes to a warming effect at about18: 00. When the temperature is very low, this effect will be delayed by 1-2 hours. In winter, the daily average temperature and minimum temperature at the far water body station are obviously lower than those near the water body. The daily temperature range is obviously higher than that of the near water body. The farther away from the water body, the weaker the warming effect of the water body is, and this difference is stronger in sunny weather conditions and smaller in rainy weather. The water body can raise the extreme minimum temperature and suppress the maximum temperature. In general, the water body has a warming effect in winter. In winter, the average temperature in the near water body is about 2.03℃ higher than that in the far water body, which can raise the minimum temperature by 2.9℃, which is more beneficial to the growth of citrus and can reduce the low temperature to the local area.

Dongjiang Lake belongs to subtropical monsoon humid climate, which has obvious three-dimensional climate characteristics because the north-south climate is influenced by comprehensive conditions such as landform, soil quality and vegetation of Nanling Mountain range, and the climate effect of Dongjiang Lake area. The annual average temperature is 17. 1℃, the annual sunshine hours are 1503.5 hours, the lowest temperature is 1 month, with an average of 5℃, and the highest is in July, with an average of 30℃. The water temperature, light and heat are moderate, which is very suitable for fish growth and development. Due to the large heat capacity of the large water body, the annual growth period of Dongjiang fish is more than one month than that of the general water body. The vegetation in the Dongjiang Lake area is well preserved, with a coverage rate of over 80%. There are no large industrial and mining enterprises in the reservoir area, and the ecology is primitive, the water quality has reached the national first-class drinking water standard after testing, and the physical and chemical factors are good.