As one of China’s largest and most westernised cities, Shanghai has many tourist sites and venues. Shanghai’s public transport system makes touring the city easy as most major attractions lie along Line 2 of the Shanghai Metro. Bus tours and river cruises along the Bund are also available. Winters are chilly and damp, and cold northwesterly winds from Siberia can cause nighttime temperatures to drop below freezing, although most years there are only one or two days of snowfall. Summers are hot and humid. The most pleasant seasons are spring, although changeable and often rainy, and autumn, which is generally sunny and dry.