I think it depends on the light. I have JW Speaker LED headlights on my jk and it will build up. If the snow is blowing the lights don't put off enough heat to melt the snow fast enough. I have cheap Amazon LED lights on my TJ and never had any problems.I've had plenty of snow, cold, and salt. The Jeep gets warm fast, no buildup around the headlights that was significant enough to cause any issue.