I've called at all hours and it's always better when the animals are out and about. I have had success at noon but not as much as at other times. If one is going to be out all day why not try. Hawks are out all day and snag rabbits at any time so a coyote can hear a scream at any time. I had better luck in heavier cover at noon. That's where a hawk would find a rabbit so it made sense to me. The best day is when the barometer is dropping and a storm is moving in. Every animal is trying to get something in it's stomach before the storm. Like I said, if you are going to be out why not try?

Dr Fatguy