Teach me how to look at the weather

Someone should just teach me how to look at the sky and predict the weather. I bought a slipper, for the sole purpose of wearing it on rainy days. BUT I wear them only when it's all bright and sunny, and keep them at home when the rain pours like there is no tomorrow.

I was thinking so hard this morning whether to try my luck and wear the slipper or not since it's been raining these few days. You know I thought so hard that from too early for class, I became late for tutorial (also because my mother was talking to me about ants!), so I just took my shoe and ran along with it. Rationale behind taking shoe:

1. It looks sunny (the sky)
2. It rained yesterday, there shouldn't be too many clouds left (the sky)

And so I confirm that I am bad at making decisions. Or rather, someone should teach me how to look at the clouds and predict if it'll rain or not.. Again, I can't make decisions. This is also very evident in my MCQs scores for the recent tests.

//the sky is unpredictable