The city has a continental, monsoon-influenced semi-arid 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 Siberian anticyclone. Spring can see 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. January averages −2.3 °C (27.9 °F), while July averages 26.8 °C (80.2 °F); the annual mean is 13.38 °C (56.1 °F). With the monthly percent possible sunshine ranging from 45 percent in July to 61 percent in May, the city receives 2,427 hours of sunshine annually. More than half of the annual rainfall occurs in July and August alone.