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A season is a division of the year marked by changes in weather, ecology and hours of daylight. Seasons result from the yearly orbit of the Earth around the Sun and the tilt of the Earth's rotational axis relative to the plane of the orbit.
Why does weather changes as the seasons change? The answer is tied to how the seasons change. The seasons change based on the tilt of the Earth and the particular regions exposure to sun at that part of the year.