Answer :
The jet stream is the center of strong west-to-east winds that travel five to seven miles above the surface.
At this altitude, the overhead jet stream influences the wind and pressure. This affects the weather we experience because it affects elements near the surface such as anticyclones and cyclones. The position of the jet stream is also affected by the season.
Due to the large temperature difference between the equator and the poles, the jet stream is stronger and moves across the UK in winter. That explains why it rains more than usual. In summer, it's the opposite, usually with less temperature difference.
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