Prerequisites:

Description:

    This is the technology of figuring out beforehand what the weather of a planet is likely to be.  Humans, in the real world, have been doing this (imprecisely) for about as long as we've been around.  At some point it might be possible to predict precisely what the weather will be at a given time in the future, given precise input data. 
    For this technology to be useful, the Computers (general) development level must be far enough advanced that the simulations that predict weather for a specific time are completed before that time comes about.  For example, an effective algorithm for weather prediction and the appropriate data might be available, but it could take 100 years to calculate tomorrow's weather precisely enough for future calculations to be useful.  The solution, therefore, is to run less precise calculations, so that they are completed in time.  This gives results that are probabilistic (a 30% chance of rain tomorrow, for example) rather than definite, but will generally still be useful.