I don't know if I have shared this before, but it's a great tool that I use in all my games. It produces a weather forecast for a month to a certain area, specified by the caster, and can even forecast upcoming months if so desired. It uses the rules as depicted in the World of Greyhawk Fantasy Game Setting Boxed Set from 1983.
Follow THIS link to read the "Scroll of Weather Forecasting" and unleash some old and powerful Suloise magic.
Thanks Tomi for putting this up 12 years ago!