A thermostat user interface for a network-connected thermostat is described. The thermostat includes a frustum-shaped shell body having a circular cross-section and a sidewall extending between first and second ends, the second end being user-facing when the thermostat is wall-mounted; a circular rotatable ring being user rotatable for adjusting a setting of the thermostat; and a circular cover including a clear circular center portion surrounded by a painted outer portion. The clear circular center portion permits a corresponding circular portion of a non-circular dot-matrix color display element to be visible through the circular cover and the painted outer portion masks a remaining portion of the non-circular dot-matrix color display element so as to create a circular graphical user interface.