Chongqing has a monsoon-influenced humid subtropical climate (Köppen Cwa/Cfa), and for most of the year experiences very humid conditions. 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.[45] Winters are short and somewhat mild, but damp and overcast. The city’s location in the Sichuan Basin causes it to have one of the lowest annual sunshine totals nationally, at only 1,055 hours, lower than much of Northern Europe; the monthly percent possible sunshine in the city proper ranges from a mere 8% in December and January to 48% in August. Extremes since 1951 have ranged from −1.8 °C (29 °F) on 15 December 1975 (unofficial record of −2.5 °C (27 °F) was set on February 8, 1943) to 43.0 °C (109 °F) on 15 August 2006 (unofficial record of 44.0 °C (111 °F) was set on August 8 and 9, 1933).[43][46]

As exemplified by Youyang County below, conditions are often cooler in the southeast part of the municipality due to the higher elevations there.