How many degrees below zero in winter in Lanzhou?

MINUS 13- 16 degrees. Lanzhou has a continental climate with large temperature difference, little precipitation, no severe cold in winter, no intense heat in summer and mild climate, with an average annual precipitation of 327mm. The lowest temperature in winter is-13 to 16 degrees Celsius, the annual average temperature is 10 degrees Celsius, the annual average sunshine hours are 2446 hours, and the frost-free period is more than 180 days.