What does summer mean?
Summer is one of the four temperate seasons. Summer marks the warmest time of year with the longest days. Summer is also the longest season of any year in length.
They call it summer because like every continent on the world it has every season. Just because it is frightfully cold does not mean it does not have a summer season. Summer does not always have to mean hot weather and sunny days! For instance take the lower half of the equator while it is summer here and nice and warm it is winter down there and not as warm.