Just try to keep it dry (and don't put it away when wet with dew or humidity). Rust may be your major concern. A breathable cover might be better than plastic? And seal every hole the creepy crawlies can get into (shower caps are your friend). You don't want to open it up and find spider webs everywhere and eggs stuck to the mirror surfaces! Also try to store with tube unit horizontal to reduce dust or anything falling onto the primary mirror - but this is less of a problem if you have it well sealed. If horizontal, you may be able to put some cloth bags of silica gel inside the tube. Check the "kitty litter" in the supermarket. One form is silica gel.
I wouldn't be concerned with the temperature extremes.
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