In the Clerestory of the nave rises twenty-seven feet above the roof of the side aisle. On each side of the clerestory, there are seven stained glass windows with run-on designs of differing patterns, each eight feet wide and nineteen feet high.

All of these windows appear high in the clerestory above the triforium (the plastered wall between the capitals of the pillars and the lower framing of the windows). Another name sometimes given to the triforium is the gallery because upon it are painted symbolic decorative insignias.

Also at each end of the transept, at the same height as the clerestory, is a most beautifully designed rose window, a circle of stained glass, twenty-two feet in diameter, with divided compartments and tracery radiating from the center.