When you're scrolling through the pre-set weather conditions, "default" doesn't have it's own weather anymore. It takes whatever is right before it. If you are scrolling left to right there is: raining -> default -> scripted. So going left to right, "default" keeps the "raining" settings. Going back right to left, "default" keeps the "scripted" settings. Hope I explained it so makes sense lol
Yes I can also confirm this, default turns into whatever weather was selected before it (as you described, either raining or scripted).