Why does Chongqing have mild winters despite its inland location?

Chongqing maintains a mild climate during the winter primarily due to its unique topography, which shields the city from extreme weather.1

The city is situated within the Sichuan Basin, an area surrounded by high-altitude ranges that act as natural barriers against cold air masses. Specifically, the Qin Mountains to the north serve as an effective barrier, blocking the frigid, dry winds that originate in Siberia and dominate much of northern China during the winter months.123

By preventing these cold waves from reaching the interior, the surrounding highlands—including the Daba Mountains and the Wu Mountains—protect Chongqing from the temperature extremes experienced elsewhere in the country. Consequently, the city experiences little to no frost or ice, with mean winter temperatures typically ranging between 47 °F (8 °C) and 50 °F (10 °C).12