Winter in Mexico and summer back there still can't compete with summer in the Mohave desert. True we are not as bad as Phoenix, Tuscon or even close by in Bullhead, but we can still expect summer daytime highs over 110 on a regular basis. As far as humidity we get a few days of moderate, feels about maybe 60%, during our monsoon season.
When I lived near Little Rock, even further south than Memphis, I didn't worry about it getting too hot for the birds. When I moved here I was surprised to find out that yes we can raise waterfowl.
We have to do things a lot differently here than anywhere else I have lived. Yes we can raise most of the same stuff that can be raised in other parts of the country.
We don't have fleas here, I have heard about ticks showing up rarely, have yet to see it after four years. We don't have racoons, opossums or many other animals are commonly found in other parts of the country that have water.
We have to grow traditional full sun crops like tomatoes in the shade in cages with minimum half inch hardware cloth, although quarter inch is better, covering top, sides and bottom. Growing trees is a trick, I am working on learning to start saplings. Gonna try that again with top and side cage buried 6" down around the side and shade during the heat of the day for the first year. The rabbit cage around the tree will probably stay for a few years. Once we can get a tree established they can do ok but they usually take a few years of diligent work. We don't have much grass, that is another thing that is difficult and expensive to grow due to the shelter and water requirement. Although I think geese might be changing that for me, time will tell. Eh, it will probably be eaten before it gets a chance to really grow.
Seems like no matter what you are trying to grow, plant or animal, there is a predator for it. I know there are predators in other parts of the country, it just seems like since the conditions are so bleak around here that when you have a juicy tasty delicacy they will do that much more so they can eat it. On top of that we have some rather brutal sun exposure and temperatures. Oh and wind storms too. Plan on 65 mph winds or more when you build shelters in there parts.
It's a very valid question on what needs to be done in order to raise ducks out here.
Oh and the dogs are camped out sleeping in a cool spot somewhere inside the house during the summer and outside working all night. I don't like dogs, especially husky and husky type breeds or brachycephalus breeds outside in the heat of the summer.
I agree that any animal needs plenty of water and shade and that is something we just don't have much of here. But we have an abundance of rocks which are bad for waterfowl feet.