Rain casting in Homesteads

I wasn't asking about that...I even talked about the weather effect myself...

I'm asking if rain casting can be trained for both "Use during a rainy day" and "Use during a clear day" requirements. My friend used it after I found a thunderstorm in my homestead, using potion making to test the % success rates. That allowed her to train her "Use on a rainy day". After that requirement was finished, I found a clear weather effect(normal success rate %) but that didn't train her "Use on a clear day" requirement.