I think the fluffies are clouds. She is saying the current temperature and cloud coverage (which affects the amount of sunlight) increases the ripening time.
Great translation so far, but I have a few suggestions. When the soldier calls the other one senior, I assume the japanese was senpai. You should just keep it as senpai because no one calls someone senior unless they are speaking spanish and if a reader doesn't know senpai, then senior won't...