It is not. Some member make 3D case for it. But, if you put it inside a case, you should still have ventilation so the air can circulate.
If you are just using it near humidifier, I think one other option is to coat it with conformal coating coating if available. Or nail polish like below.
There is one area should not be coated. There is one sensor that has a hole in it. This should not be coated to get good reading. We just have to risk it in such use.
There is a picture where you may not want to coat it…
