This is diagram of circulation on the Earth (left), and Uranus (right).
The weather on earth can be described this way: air rises where it is warm (at the equator), and moves to where it is colder, (at the north pole).
Because Uranus lies on its side, with the north pole facing the sun for half a year, Uranus' weather cannot follow that basic pattern. The air would not rise at the equator because the equator never faces the sun.
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