Shenyang has a monsoon-influenced humid continental climate characterized by hot, humid summers due to the monsoon, and dry, cold winters due to the Siberian anticyclone. The four seasons here are distinctive. Nearly half of the annual rainfall occurs in July and August. Monthly mean temperatures range from −11.2 °C (11.8 °F) in January to 24.6 °C (76.3 °F) in July, for an annual average of 8.53 °C (47.4 °F). The frost-free period is 183 days, which is long considering the severity of the winters. The city receives 2,468 hours of bright sunshine annually; monthly percent of possible ranges from 45 percent in July to 62 percent in October. Extreme temperatures range from −33.1 °C (−28 °F) to 39.3 °C (103 °F).