The major reason for all the seasons is because of the axis.

For winter, our part of earth is tilted away from the sun, while the southern part is facing towards the sun. When it comes to summer, we are closer to the sun while the other part is further away. But, since we are away from the sun in the winter, we get longer periods of the day. But, during the summer, it’s shorter than the winter periods.

During the fall and the spring, we are medium lengths away from the sun. Which means that we might get longer days. It takes the sun’s rays longer to reach the earth. But, during the summer, it will take a shorter amount of time since it is Closer to the sun. But the winter, it takes a longer amount of time for the sun to reach our planet because we are further away from the sun.

So, since the axis that the world is sitting on is tilting, the seasons that we now are born. http://blog.elanco.org/connolmr17/