sorry for the semi-thread jack...

I have the opportunity to get in on a group purchase of grain, which will cut my shipping costs down by $20 per sack from the regular one at a time rate I usually purchase at.
I don't have the room at my house for a year's worth of grain, but my father-in-law has a huge garage. Spoke with him and he'd be happy to keep the grain for me, given that I already supply him with endless kegs of the blonde ale he likes.
Question: The garage stays at 70-80df for most of the year, and it does get humid from time to time (we live in florida) though its not too bad at his place. Is it worth it to do the buy, or is it too much of a risk that the grain will go bad that I'll wind up throwing out ruined grain?
Thoughts?