If weather spells are real, they would be limited to nature as well. You cast a snow spell, but you live in the desert or its summer, if it works, you will see rain.
Weather spells do not cause a single cloud to appear over your head, it would have to move a weather pattern into your area which effects the whole planet, causing droughts in one area, floods in another. It would also take a lot of energy to pull off. If weather spells work, its best to leave it up to nature.
Cultures have stories about 'rain dances' or spells to bring certain weather, but only in life or death situations were they cast. I love snow, but I wouldn't cast a spell because I wanted some flurries, it will come in due time. If you live somewhere where there is no snow, look into vacations or moving somewhere where there is.