A window assembly includes a window frame and an exterior window treatment system mounted to the window frame. The exterior window treatment system has a treatment storage housing configured to receive an exterior window treatment movable between a stored position within the treatment storage housing and a deployed position extending from the treatment storage housing. The window system also includes at least one guide for guiding the window treatment between the stored position and the deployed position. The window assembly includes at least one interface frame coupled with each of the treatment storage housing and the at least one guide for engaging the window treatment system to the window frame.