Due to its elevation, Jiulong County has a
subtropical highland climate (
Köppen Cwb), with strong
monsoonal influences; winters are frosty and summers warm with frequent rain. The monthly 24-hour average temperature ranges from in December and January to in July, while the annual mean is . Over 75% of the annual precipitation of occurs from June through September. With monthly average percentage of sunny days ranging from 32% in July to 58% in January, the county seat receives 1,983 hours of bright sunshine annually.
Diurnal temperature variation is large, averaging annually. ==References==