The Times has a pretty good version of the “Mets attendance” story that pops up once a week. This one uses regression analysis and has charts and tells us..
First, the downward trend appears to be accelerating. Through their first 10 home dates, the Mets were averaging 29,281 fans, just barely behind last season’s pace. Since then, however — despite playing most of their home games against the Phillies, Dodgers and Giants, who are usually good draws in New York — attendance has averaged just 28,024, versus 34,425 for the comparable period in 2010.
You can argue back and forth if we’re comparing apples to bad weather apples, but the article is a good read.