Southern Tier's Irish Coffee Cream Ale in spring, Bell's Oberon in summer. Autumn is usually Great Lakes Oktoberfest, but also Oberon until they stop making it.
During the winter I like Old Rasputin Russian Imperial Stout and around Christmas, Twelve Dogs' Christmas Ale.
Blue Moon is my domestic go-to if I can't get one of those above at a bar/restaurant. PBR and Miller High Life are pretty solid for American lagers too.