Cloning Question - Something I Just Don't Get

I understand the whole concept and process of cloning, but I don't get one thing. People say to clone so that you can harvest all year long, but am I right in saying that if you grow outdoors cloning that way wouldn't work because by harvest time it'll be colder and your clones won't be able to grow outside? That's what it seems like to me. If I harvest in Late September- Early October, then what's the point of cloning? Also, I live in the northeaster US and can't really do anything inside yet.
 
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