Everybody always complains that when it's warm out the coyotes have such an easy time finding food that they don't respond well to calling. I've heard people say, "wish it was colder, make em hunt up the sound a little bit more." Generally the people who I hear say this, kill very few if any coyotes. It's been my experience that yotes are most succeptable to calling immediately preceeding, or following a really cold snap. Reguardless of the tempurature, if it is significantly warmer than it has been coyotes are more active in my opinion. (unless your talking about extreme heat, in which case I have no experience calling in).If its been -20 every night for the past week, and today it's 10 above with lows hovering around 0, it's an opportune time to kill dogs. Today it was fifty some degrees in Fargo, The past two months it's been below zero almost everynight, and sometimes never above zero during the day. I wish I would have been out today. I guarantee you that people are not the only ones glad to see the warm up, and I think coyotes would have been fun to call today. Just my theory. To me an ideal day is 36 degrees, overcast with a cold front moving in, NW winds 3-5 mph, one inch of fresh snow on the ground, and a mouth full of copenhagen long cut.