I had stored it in a plastic bag in a shed subject to seasonal temperature variations for 2 years, and it was less than 5 years old. (mechanics.stackexchange.com)
If you live in an area that has a wide seasonal temperature variation, you should really pay attention to this. (pawster.com)
However, there was no seasonal variation in the proportion of male births and no relationship between the proportion of male births and the highly seasonal temperature variations, which showed clear seasonal correlations. (journals.plos.org)