I like T8's in the brightest temp range I can find, shouldn't be any problems with temp swings. My relatives still use a combination of T12 and T8s in unheated garages and barns, and theyre not too far north of you between Tug Hill and the Adirondacks, just over the Oneida-Lewis county border.
Btw, am a big fan of Unadilla, used to love attending races there.