Hey youngtrapper,
It can be easier to hunt them with snow for one they are easier to see, also they tend to be hungry durring the winter and will come into a distress call. You may want to stay on a stand for about 30+ minutes because it may take them a little longer to get there in the deep snow. Always remember the wind is the most important thing when hunting Coyotes. Coyotes tend to circle in downwind to identify the prey with there nose first, so in my opinion always set up in a cross-wind and hopefully see them before they see you. Snow can be helpful in finding fresh tracks as well.
good luck,
BVW