Springfield, Oregon of Springfield that stated, in part "Yo to Springfield, Oregon – the real Springfield." In April 2012, Groening confirmed to "Smithsonian" magazine that he named the fictional Springfield after Springfield, Oregon. He also confirmed that he intentionally left it a secret to allow people the enjoyment of assuming it was based on their own Springfield. This region experiences warm (but not hot) and dry summers, with no average monthly temperatures above . According to the Köppen Climate Classification system, Springfield has a warm-summer Mediterranean climate, abbreviated "Csb" on climate maps. Springfield, Oregon Springfield is a city in Lane County, Oregon,
Matt Groening that he feared viewers would "see it as nothing but a pathetic attempt to advertise "The Critic" at the expense of "The Simpsons"," and was concerned about the possible implication that he had created or produced "The Critic". He requested his name be taken off the episode. Groening is credited with writing or co-writing the episodes "Some Enchanted Evening", "The Telltale Head", "Colonel Homer" and "22 Short Films About Springfield", as well as "The Simpsons Movie", released in 2007. He has had several cameo appearances in the show, with a speaking role in the episode "My Big Fat Geek Wedding".