Cold, warm, it doesn't matter. At this time of year, if it's sunny, they'll be gobbling.
Don't call too much. A hen that yaks a lot is coming to the tom. Play hard to get.
I just use a hen. But if I get a tom hanging up, I'll throw in a jake gobble to make him think he has competition. Best spot to set up is near as you can get to the birds you're hunting. Make sure they have an easy travel route to your location. Obstacles will hang them up. Good luck