Is there a certain height on a stud to install a junction box?

No. Put it where you need or want it.

.....unless you wish to satisfy the ADA, then switches are at 48" to the top.

Remember, junction boxes cannot be concealed in a wall.

Define junction box.

As long as the cover is accessible when done you can literally put a junction box (almost) anywhere.

Who's got snow?

'Lil bit.

Don't understand, you are suppose to be up to your knees in it?
Two inches here , gone now.