An image forming apparatus includes an image bearing member; a developing device for developing an electrostatic image formed on the image bearing member with a developer into a developed image; transferring means for transferring the developed image onto an image receiving member; cleaning member, contacted to the image bearing member, for removing a residual developer from the image bearing member; detecting means for detecting an ambient condition of the apparatus; wherein the developing device is capable of transferring a developer onto a non-image formation region of the image bearing member, and the developer on the non-image formation region reaches a cleaning position of the cleaning member; and wherein an operation of transferring the developer onto the non-image formation region is controlled in accordance with an output of the detecting means.