Yinchuan has a cold desert climate  with an annual rainfall of 186 mm (7.32 in). Yinchuan has distinct seasons, with dry, cold winters, late springs and short summers. The monthly 24-hour average temperature ranges from −7.9 °C (17.8 °F) in January to 23.5 °C (74.3 °F) in July, with the annual mean at 9.00 °C (48.2 °F). Diurnal temperature variation tends to be large due to the aridity, which also partly contributes to the sunny climate; with monthly percent possible sunshine ranging from 63 percent in three months to 71 percent in November, the city receives 2,906 hours of bright sunshine annually. There are 158 frost-free days.