Chongqing has a humid subtropical climate (Köppen Cfa), bordering on a monsoonal humid subtropical climate (Köppen Cwa) and for most of the year experiences very high relative humidity, with all months above 75%. Known as one of the "Three Furnaces" of the Yangtze River, along with Wuhan and Nanjing, its summers are long and among the hottest and most humid in China, with highs of 33 to 34 °C (91 to 93 °F) in July and August in the urban area.[50] Winters are short and somewhat mild, but damp and overcast.