Hengnan experiences mild winters with temperatures ranging from around 7°C in January, the coldest month, to 25°C. Spring is a time of gradual warming, with temperatures rising to an average high of 32°C by April and remaining warm through May. Summer months bring relatively stable temperatures, peaking at around 36°C in July and August before slowly decreasing into autumn. Autumn is characterized by cooler temperatures, returning to averages similar to those seen in spring by October. Winters are generally mild once more, with December temperatures hovering around the same levels as January.