Bowling is just like other sports. If you are more serious, you do it all year long. Some sports, like soccer move from outdoors to indoors. Baseball has exercises and indoor practice arenas over the winter. Basketball is played in the gym all year. So, why stop bowling?
So many bowlers take the summer off. And, they have this
roller coaster average where they are lower in Sept and higher in April. Bowling through the Summer levels that, and possibly shows a gradual increase in average.