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吉林省位于我国东北地区中部,地势东南高,西北低,由东南向西北倾斜,属大陆性气候。多年平均降水量为621.9毫米,70～80％的降水量集中在汛期六到九月,冬季十一月至次年三月份五个月的降水总量,仅占年降水量的4～8％,尤以西部平原地区更突出。由长白山往西,降水量递减而蒸发量递增,多年平均水面蒸发量为700～1200毫米。
Jilin Province is located in the northeastern region of China, high in southeast, low in northwest, southeast to northwest tilt, belongs to continental climate. The average annual precipitation is 621.9 millimeters. The precipitation of 70-80% is concentrated in the flood season from June to September. The total precipitation in November to March is only 4-8% of the annual rainfall. , Especially in the western plains more prominent. From Changbai Mountain to the west, the amount of precipitation decreases and the amount of evaporation increases. The average water surface evaporation over many years is 700-1200 mm.