For some they can be.
Last few summers, I did not see a drop in overall numbers. But HOW you get to your monthly would change some. Maybe more clips instead of membership, or vice versa.
Before the past couple years, summer sales would dip around 10-15%, and be back up in fall.
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Should You Email Your Members?
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Enough Said. 
"Would you rather live like a king for a year or like a prince forever?"
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