Predict Weather

Information
Forecasts the weather accurately for a given location over a given time.
This forecast does not take magical meddling into account, or predict the actions of other wizards!

Cost: 2 times the length of the forecast, in days. Double the cost for a location outside the general area (say, over the horizon). Quadruple the cost for a place on another continent. This spell cannot predict weather on planets or planes other than the one where the caster currently is.
Time to cast: 5 seconds per day forecast.
Prerequisites: At least four Air spells.