Baoding has a continental, monsoon-influenced humid continental climate,characterised by hot, humid summers due to the East Asian monsoon, and generally cold, windy, very dry winters that reflect the influence of the vast Siberian anticyclone. Spring can bear witness to sandstorms blowing in from the Mongolian steppe, accompanied by rapidly warming, but generally dry, conditions. Autumn is similar to spring in temperature and lack of rainfall. The annual rainfall, about 60% of which falls in July and August alone, is highly variable and not reliable. In the city itself, this amount has averaged to a meagre 513 millimetres (20.2 in) per annum. The monthly 24-hour average temperature ranges from −3.2 °C (26.2 °F) in January to 26.8 °C (80.2 °F) in July, and the annual mean is 12.9 °C (55.2 °F). There are 2,500 to 2,900 hours of bright sunshine annually, and the frost-free period lasts 165−210 days.