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I'm not sure if the question is referring to "pass", a geological feature, or "past", in which case it's not clear whether you mean ten years ago or a thousand years ago.

So, here's a generic answer.

The basic "prediction" of weather comes down to "when it looks like this, what usually happens." When a meteorologist says "There's a 30% chance of rain tomorrow," what that basically means is "in this area we've seen conditions... temperature, wind, clouds, air pressure, all that stuff... like this before, and three times out of ten it rained the next day."

Nowadays (and actually for a considerable time in the past) computers are used for this, but really what's made forecasts more accurate than they used to be is not so much the fact that computers are used, but that we've got more data now. If you've only got records going back 20 years, then a given set of conditions may have only occurred a few times and your prediction is necessarily a bit shaky. If you've got records for 200 years, then you've got a bigger sample to base your predictions on.

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13y ago
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Q: How did meteorologists predict the weather in the pass?
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