How many degrees below zero in winter in Lanzhou?

it's about 13-16 degrees below zero. Lanzhou has a continental climate in the middle temperate zone, with large temperature difference, little precipitation, no severe cold in winter and no intense heat in summer. The climate is mild, with an average annual precipitation of 327mm, the lowest temperature in winter between minus 13 and 16 degrees Celsius, an average annual temperature of 1 degrees Celsius, an average annual sunshine hours of 2,446 hours, and a frost-free period of more than 18 days, which is relatively warm.