Beijing has a monsoon-influenced humid continental climate, characterized by very hot, humid summers due to the East Asian monsoon, and brief but cold, dry winters that reflect the influence of the vast Siberian anticyclone.Spring can bear witness to sandstorms blowing in from the Gobi Desert across the Mongolian steppe, accompanied by rapidly warming, but generally dry, conditions. Autumn, similar to spring, is a season of transition and minimal precipitation. The monthly daily average temperature in January is −2.9 °C (26.8 °F), while in July it is 26.9 °C (80.4 °F). Precipitation averages around 570 mm (22 in) annually, with close to three-fourths of that total falling from June to August. With monthly percent possible sunshine ranging from 47% in July to 65% in January and February, the city receives 2,671 hours of bright sunshine annually. Extremes since 1951 have ranged from −27.4 °C (−17.3 °F) on 22 February 1966 to 41.9 °C (107.4 °F) on 24 July 1999 (unofficial record of 42.6 °C (108.7 °F) was set on 15 June 1942).