I would say NO. What if the temperature drops lower & you have freezing temperatures? What if you encounter a heat wave & the temp soars over 100? If you cannot maintain a more even temperature, say 65-80 degrees, then I wouldn't store my stamps in that environment. The heat will cause the rubber to expand & the glue has a tendency to "release", causing your rubber to come loose from the foam. The cold will cause the rubber to contract & could become brittle over time. And if you are in a dry climate, you may suffer the ravages of dry-rot, especially with the stamps you don't use often.
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