Just thought of a champion who's ultimate comes in 4 different weathers.
Pressing R causes it either to rain, snow, wind or lots of hot sun.
If it rains, the enemy's vision and fog of war is smaller
If it snows, the enemy walks slower
If its windy the wind pushes the enemy in a certain direction all the time
And if its hot and sunny they take more damage
And the weather is like global, all over summoner's rift