Thái Nguyên
With terrain sloping from high mountains to the low zones and midlands, in terms temperature in winter, Thái Nguyên has three climatic sub-zones. A cold sub-zone in Võ Nhai District, a temperate subzone including Định Hóa, Phú Lương and southern Võ Nhai districts and a warm subzone which includes Đại Từ, Đồng Hỷ, Phú Bình, Phổ Yên districts, Thái Nguyên City and Sông Công City.