the only yhting that affects fake tan is sweat, water, and sometimes moisturizer. i alays have the problem that if its a hot day and i cross my arms for too long the sweat builds up and the fake tan goes more quickly in that area! its such a pain! the sweat will have the same affect as water does on your fake tan. i dont think in matters how hot the water is, and air wont affect it. if you are wondering why your tan didnt develope or something, if you are naturally pale, then your skin doesnt take to tan as well as people with darker skin does, so make sure you are using one for pale skin, and maybe keep putting it on untill you get the shade you want.
hope that helps! <3