Weather is very short term. Hard to predict more than 5 days in advance. There are a lot of factors that effect it, but within 3 or so days, the weather is pret

Weather is very short term. Hard to predict more than 5 days in advance. There are a lot of factors that effect it, but within 3 or so days, the weather is pretty good. Climate models are the long term. What climate scientists seem to do, is create the model, then test it against the last period of time where they have good data. (Given what we know about past climate, what would we predict for the last 5? years. since the last 5 years already happened, they can compare the model to reality). Obviously since we only have only one planet and a short time to test on this verification isn't perfect, but they have a lot of computing power and its the best we can do.