Yanji is situated among foothills, with the main metropolitan area contained in a small, very flat area. It is ringed by mountains dotted with small, remote farming communities. It has a four-season, monsoon-influenced, humid continental climate.
Summer is short, hot and very humid. Sunshine is generous but falling far short of the central and western parts of Jilin; with monthly percent possible sunshine ranging from 39% in July to 62% in February, there are 2,280 hours of bright sunshine annually.
Spring and autumn constitute very short transitions with some, but usually not heavy, rainfall.
Winter is long and chilly.