I would say that Dragonfly speaks the truth, however degradation may be unpredictable and unreliable since for example a certain amount of moisture may have to be present to catalyze reactions that facilitate or equate this degradation. Something like that may not be a catalyst in the traditional sense but still a condition that can make a difference that is not linear but exponential. I must admit I am not 100% sure about this, but it is the best explanation I can give for inconsistent responses on the subject.
Weather and other more small scale environmental factors can contribute to things like moisture presence, which makes the whole thing chaotic to evaluate.
What to take away from this is: if you want to be able to rely on the quality and potency of your LSD, store it properly. If you do not, it may be a gamble.