It isn't... In some countries the games are played from March-November because it is too cold to play during the winter while in other countries it is too warm to play during the summer and then most leagues give their players a couple of weeks vacation during the summer like on regular jobs. That's why most leagues play from June-May, and in some leagues there's a break from Nov-Jan
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Football is a winter sport in nations where the climate is hotter. Colder climates have football during the summer, as well as the MLS, traditionally because this opens up a lot of opportunities to loan players from Europe who don't want to lose all their competitive rhythm over their summer vacation.
This is because the air is more compressed and is a lot denser when you kick it.