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Off the cuff, I'd say by using their fancy pants instruments. Barometers measure atmospheric pressure; gauging relative pressures can indicate whether a high pressure system is moving towards or away from you; same general principle can be gauged using thermometers, ie. high vs. low temperature systems. Satellite systems give a pretty good indication of atmospheric moisture content, ie. where massive clouds are forming vs. where they may go; also they can indicate wind patterns via cloud 'flow.' Last, ocean currents are fairly reliable indicators of the seasons - hot water from the tropics flowing north (and south) from the tropics into regions where cold water is flowing south (and north) from the equators; fairly regular patterns have been established.

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