Since the calendar year is related to the orbit time of the Earth it means that it is increasing by a negligible amount each year as friction slows the Earth.
Over a few years this is not worth mentioning so it can be assumed that each calendar year is the same length of 52 weeks exactly. Thus,, because the length of a year is fixed, the summer holidays would increase but this increase would have to be met by shortening the school year until they equalise at 26 weeks is.
Of course summer is
de facto defined as the time when the part of the Earth you're in is nearest the sun, this is because the Earth is tilted on it's axis at about 22.5 degrees relative to the sun. In the Northern Hemisphere this relates to June, July and August but could be extended by up to a month in either direction based up climate and weather.
Therefore, with summer being defined as three months then the school year must also be three months leaving half the year as neither summer nor school
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Well, I figured out how to access my administrator files, so yay me. 
Now to find another Glee picture to spam you with... 
