The Earth's seasons are not caused by the differences in the distance from the sun.

The seasons are the result of the tilt of the Earth's axis.

In summer, the sun's rays come straight on our country : the weather is very hot.

In automn, the rays come increasingly tilted : the weather starts to be cold.  

In winter, the rays  are most tilted: the weather is very cold .

Lastly, in spring, the rays come increasingly straight : it starts getting hot.