Random thought:
Priestly Control Weather can, if Weather is a major sphere, move the weather by 2 steps, which would let you take a typical Athasian Hot, Clear, Calm day and turn it into Cool, with a light rain and a strong wind. It lasts for 4d122 hours (average of 52), and covers 4d42 square miles.
So, does that note about “if Weather is a major sphere” apply if someone has Major access to Air (the only way to cast it on Athas)? And, more fun for gaming, what if someone starts doing this? Just a high-level templar, cleric, or druid who just casts this every other day or so?