Xi'an has a temperate climate that is affected by the East Asian monsoon, situated on the borderline between a semi-arid climate. The Wei River valley is characterised by hot, humid summers, cold, dry winters, and dry springs and autumns. Most of the annual precipitation is delivered from July to late October. Snow occasionally falls in winter but rarely settles for long. Dust storms often occur during March and April as the city rapidly warms up. Summer months also experience frequent but short thunderstorms. The monthly 24-hour average temperature ranges from around the freezing mark in January to 27 degree Celsius in July, with an annual mean of 14.08 degree Celsius. With monthly percent possible sunshine ranging from 31 percent in December to 47 percent in August, the city receives 1,536 hours of bright sunshine annually. Extremes since 1951 have ranged from -20.6 degree Celsius on 11th January 1955 to 41.8 degree Celsius on 21st June 1998. The highest record of 42.9 degree Celsius was registered in another station on 17th June 2006.
Best time to Xi'an
March to October are the best time to travel to Xi'an. Among them, Xi'an is famed for its annual festivals; especially Silk Road International Tourism Festival. Every September people gather in downtown Xi'an for this event. Fireworks, folk music and dance performances, talent shows, cultural exhibitions are all part of the itinerary.