What causes seasons to change? Seasons are caused by direct light on a hemisphere, or indirect light!
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Winter in the Northern Hemisphere Summer in the Southern Hemisphere
The Sun's rays that hit the Northern Hemisphere are spread around over a large area. The Sun's rays that hit the Southern Hemisphere are concentrated over a smaller area. Where the Sun's rays are more concentrated, there are hotter average temperatures.
Summer in the Northern HemisphereWinter in the Southern Hemisphere
The Sun's rays that hit the Southern Hemisphere are spread around over a large area. The Sun's rays that hit the Northern Hemisphere are concentrated over a smaller area. Where the Sun's rays are more concentrated, there are hotter average temperatures.