Imagine we Can have a Thunderstorm,Blizzard or Heavy Rain/Downpour
Thunderstorm (Will happen during Normal rain):
Can buff Character that have Lightning Attribute
Blizzard (Can Happen During Winter):
Will give slowness to Enemy
Heavy Rain/Downpour (Will Replace Thunderstorm if Thunderstorm didnt Happen):
Will give wet Ailment and if a Character have Ice Attribute it can freeze the Enemy
(All of this are Based on Monster Hunter Wild weather event)