They can make it rain, some perform Arcane rituals, some pray. But of course there is the old tried and true methods. -- Knitnan
There's a reason why the Affiliate College of Rainmakers is on a boat. And why the uniform contains rain coats and wellingtons. You don't collect so many Rainmakers in one place without taking precautions. It's only by the third year of attempting control that many students actually achieve it.
Though it is hard to tell without field trips.
Some need specific circumstances to make the rain fall. Some... can't make it stop. The school gets far more of the latter than the former. And one of those was an unlucky soul called Kem. They were in their fourth year at the Affiliate College of Rainmakers, and the rain still fell on them.