Abstract: A snow shield assembly for use with a traffic signal is described. The snow shield assembly typically comprises a shield collar, lens shield, extension ring, and mounting assembly. In some variations, a signal visor may be further included. The snow shield assembly can be retrofit for use with existing traffic signals. The design and configuration of the snow shield assembly creates a gap between the lens shield and the shield collar, providing a second egress for blowing snow in addition to the open bottom portion of the existing signal visor, helping to prevent the obstruction of the signal lens by falling snow. Further, the extension ring permits use on traffic signals having louver covers over the signal lenses.