@rapest_of_super_heros: You are correct that it isn't an entity in the 616 universe. Whatever the sentience of the universe was, it bonded to Galan to become Galactus of the 616 universe. Together, they saved themselves from the previous universes destruction to become a new being.
Spring - March Summer - June Autumn - September Winter - December
Those are the general months the seasons start and my best guess at what could be added for the month. Any month within a three month span is technically that season, so they wouldn't be "wrong" either.
Only Winter would have to be watched out for, since it could happen at the end of or beginning to a new year, and you'd need the year on the cover or in the indicia, or by looking at other issues in the series (most should have a year at least somewhere). Putting a note in the description wouldn't hurt either.
That's my 2 cents. Aztek may have differing opinions (as always).
" Thanos is just an obsessed, Villain Sue, loser, power-junkie, douchebag. He doesn't love Death, he's just psychotically infatuated with her. Wesley Wyndam Pryce is someone who truly loved with his entire being. "