Why do we have different the seasons?

Due to the revolution of earth around the sun.

Explanation:

Since the earth is tilted at 23.5°, therefore at some point during revolution the southern hemisphere is closer to the sun and experiences summer while northern hemisphere experiences winter. At some other point the southern hemisphere is away from the sun and experiences winter while the northern hemisphere experiences summer.

HOPE IT HELPS...

sure what is it? ^w^

if the temperature drops and becomes cool

then the atmosphere can be freezing as the water vapor in the air is at maximum (100%) and can be severely cold

also can be snowing lightly as the moisture in the air will start to solidify

and btw this is not chemistry but