Colder Weather is better for Hunting Coyotes/Predators,they need to eat and stay warm so they will come in to the sounds better.Use very little movement,stay concealed and don't over call them.I like hanging a feather on a limb to draw thier attention.Coyotes like to hang around Pasture's and usually move before and after a good Snow much like Deer.I usually Hunt out of my elevated ladder stands when Calling or set up where I have a good view and as Mulder Chuck mentioned....fresh cut hay fields really draw in the Predators!