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Most of the longer series start in Spring or Fall and run through Summer or Winter. Thus generally the larger shows start in those seasons while the smaller run shows start in Winter or Summer.
Also because it is the Spring or Fall shows that run two seasons, their is generally not as many new shows in Winter or Summer because the time slots on TV are already filled.
As to why it is Spring and Fall? Best guess it is the start of the school year in April and October is the half way point.
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