The ornamental design for a window well cover, as shown and described.
FIG. 1 is a perspective view of a window well cover;
FIG. 2 is a cutaway perspective view thereof;
FIG. 3 is another perspective view thereof;
FIG. 4 is a front view thereof;
FIG. 5 is a rear view thereof;
FIG. 6 is a right-side view thereof, the left-side view being a mirror image thereof;
FIG. 7 is a top view thereof;
FIG. 8 is a cutaway top view thereof;
FIG. 9 is a bottom view thereof; and,
FIG. 10 is an environmental view thereof.
Structure and environment shown in dash-dash-dash broken lines form no part of the claimed design.
The window well cover is shown with symbolic breaks in its length and its width. The appearance of any portion of the article between the dot-dash-dot boundary lines forms no part of the claimed design.