Helpful Hint:
If you say מוריד הטל during the summer months, it helps a lot to prevent forgetting.
If definitely helps during the winter:
1. If you start saying מוריד הטל, you are likely to remember to say משיב הרוח.
2. Even if you forget, you don’t have to repeat.
In the summer, it is also a bit helpful, although less so. When I accidentally say משיב הרוח, I remember right away that I am supposed to be saying מוריד הטל, so even though I still have to go back, at least I don’t have to go that far back. And it is really unlikely that I’d forget the second time.