When LiPo's first came out, I had experimented with storing them in the freezer and it was very impractical. What I found was that condensation would form after pulling them from the freezer and if you have any level of humidity then rust will form on your exposed metal in no time! It is important to store your packs below 77°F:

https://batteryuniversity.com/learn/...ased_batteries

I feel that anything below 25°C / 77°F is reasonable storage with the expectation of replacing my packs every 6 months to a year: