Controlling the weather is possible, is of smart? Nope. Controlling weather can happen say if you cast a spell if there is dark clouds for rain, there's a good chance it will work. But, if you do a spell for snow in summer, dumb idea, won't work. At all.
There is not a butterfly effect spell, I have not heard of that and I practice weather magic sometimes.
Weather magick is someing that is good to start for newbies, but it's a serious skill and art. If you cast spell for rain all week, what about another place that needs rain in your city but only has sun due to the rain from you? We must think of our actions.