I'm not sure exactly how much humidity affects the acrylics because I never spray outside. My shop sits at about 67 or 68 farenheit. I flash it dry with a hair dryer. I'm going to say that humidity probably will have very little affect even if I was spraying it outdoors.
I use a 20 gallon stand-up compressor without a moisture trap, mainly because it's waterbased paint, so a tiny bit of moisture isn't going to hurt it. If I was spraying oil-based I would use a trap.
I find that the majority of acrylics that are either designed for automotive use, or that used for lexan RC car bodies, work pretty much the same. VERY low smell and can be flashed off and dried quickly. I can remask an area as soon as the paint is dry and cooled to room temps after using the hair dryer.
I'd never paint at all if I had to rely on the weather to use rattle cans. Acrylics are all I work with except for priming the nose cones.
Also, my shop is in the basement in the house and I get no complaints from the family except for the noise of the compressor when it kicks on, haha.