Sports Reference Blog
Field and Stadium Types Added to Team Game Finder
Posted by Mike on November 8, 2012
We've just added field type (grass or artificial) and stadium type (domed, open, or retractable roof) to the team game finder tool, which you can use to learn that Oakland is 1-7 in road games on turf in the past 5 years or the Packers are 18-12 in domes since 2002. In addition, we are trying to hunt down data indicating whether a retractable roof stadium was open or closed on gameday -- if you have any source of that data, let us know in the comments.
As a Colts fan and season-ticket holder, I have tracked all circumstances of the roof and window during Colts games at Lucas Oil Stadium since it opened. I don't know if I am enough of an official source for you, but I am 100% sure of the accuracy of my data. If you are interested, please email me at the address I just entered in order to leave this reply.
This information is usually found in the PDF version of the Gamebook. These were available on NFL.com but don't seem to be there anymore. You could try visiting the Team websites for the Gamebooks.
Following on #2
Here are a couple of examples with the roof open
http://www.nflgsis.com/2003/REG/09/26396/Gamebook.pdf
http://www.nflgsis.com/2011/REG/09/55283/Gamebook.pdf