I specified what I meant by inputs and outputs in my original comment. Whether it rained today, whether it was cloudy yesterday, how hot is it going to get, tha

I specified what I meant by inputs and outputs in my original comment. Whether it rained today, whether it was cloudy yesterday, how hot is it going to get, that sort of thing, are the observable weather, the things most people care about when checking a weather forecast. But you can't only train on those things and expect to come up with accurate predictions. You also need to train on the things that cause that observable weather (air currents, warm fronts, etc.)