The solution is to rotate the window until its long edge is parallel to the nearby roof line, to better maximize the space available for a window. Thus, not only is the window area (and thus incoming light and ventilation) maximized, but building or buying a custom window is avoided.
An alternative explanation for the orientation of the window is that getting at least one corner of a window up as far as possible in the interior of the house allows hot air (which rises to the top of the room) to escape on summer afternoons. However, this reasoning seems suspect, as Vermont is not as hot as many other locations, where the windows are not ubiquitous. If heat escape were the goal, diagonal windows could be placed in other walls as well.
George Nash, Renovating Old Houses: Bringing New Life to Vintage Homes. The Taunton Press, Newtown, Connecticut, 2003, p. 8.
George Nash, Renovating Old Houses: Bringing New Life to Vintage Homes. The Taunton Press, Newtown, Connecticut, 2003, p. 8.
Howard Frank Mosher, A Stranger in the Kingdom Archived 2019-12-15 at the Wayback Machine, Houghton Mifflin Co., New York, 1989 (republished 2002), p. 46. https://books.google.com/books?id=Y4bLstlIhTMC&q=Howard+Frank+Mosher,+A+Stranger+in+the+Kingdom
Justin Falango, "Architectural Details: New England Archived 2020-01-11 at the Wayback Machine", Dover, Kohl & Partners, May 26, 2011; accessed 2012.04.23. http://doverkohl.blogspot.com/2011/05/architectural-details-new-england.html
George Nash, Renovating Old Houses: Bringing New Life to Vintage Homes. The Taunton Press, Newtown, Connecticut, 2003, p. 8.
Howard Frank Mosher, A Stranger in the Kingdom Archived 2019-12-15 at the Wayback Machine, Houghton Mifflin Co., New York, 1989 (republished 2002), p. 46. https://books.google.com/books?id=Y4bLstlIhTMC&q=Howard+Frank+Mosher,+A+Stranger+in+the+Kingdom
Justin Falango, "Architectural Details: New England Archived 2020-01-11 at the Wayback Machine", Dover, Kohl & Partners, May 26, 2011; accessed 2012.04.23. http://doverkohl.blogspot.com/2011/05/architectural-details-new-england.html
Kathryn Eddy. Building Blocks: Exploring witch windows Archived 2020-04-07 at the Wayback Machine Barre Montpelier Times Argus. July 30, 2012. https://www.timesargus.com/news/building-blocks-exploring-witch-windows-in-vt/article_e688c115-858d-5cd7-9c53-5228b9e25e40.html
Vermont--diagonal "witch windows" in houses Archived 2012-03-20 at the Wayback Machine "The Straight Dope". http://boards.straightdope.com/sdmb/showthread.php?t=162427
Evan Coughlin, Window That Fends Off Witches?, Newslinc, October 14, 2010; accessed 2012.02.15. Archived January 11, 2020, at the Wayback Machine http://news7newslinc.net/around-nek/unique-vermont-window-102010
For more about witches flying through windows, see Angelique Van Engelen, "What Made Witches Fly?" (http://ezinearticles.com/?What-Made-Witches-Fly?&id=484076), Ezine Articles, August 12, 2010.
Howard Frank Mosher, A Stranger in the Kingdom Archived 2019-12-15 at the Wayback Machine, Houghton Mifflin Co., New York, 1989 (republished 2002), p. 46. https://books.google.com/books?id=Y4bLstlIhTMC&q=Howard+Frank+Mosher,+A+Stranger+in+the+Kingdom
George Nash, Renovating Old Houses: Bringing New Life to Vintage Homes. The Taunton Press, Newtown, Connecticut, 2003, p. 8.
De la Cruz, Pacita T. (1984). "8419 Germantown Avenue". Adaptive re-use: An Early Twentieth Century Approach in Chestnut Hill, Philadelphia, by Dr. George Woodward, Developer, and Herman Louis Duhring, Jr., Architect (Master's thesis). Philadelphia, PA: University of Pennsylvania. p. 147 (pdf p.307). Archived from the original on 2018-12-25. Retrieved 2018-12-24. https://repository.upenn.edu/cgi/viewcontent.cgi?article=1542&context=hp_theses
George Nash, Renovating Old Houses: Bringing New Life to Vintage Homes. The Taunton Press, Newtown, Connecticut, 2003, p. 8.
De la Cruz, Pacita T. (1984). "8419 Germantown Avenue". Adaptive re-use: An Early Twentieth Century Approach in Chestnut Hill, Philadelphia, by Dr. George Woodward, Developer, and Herman Louis Duhring, Jr., Architect (Master's thesis). Philadelphia, PA: University of Pennsylvania. p. 147 (pdf p.307). Archived from the original on 2018-12-25. Retrieved 2018-12-24. https://repository.upenn.edu/cgi/viewcontent.cgi?article=1542&context=hp_theses
Justin Falango, "Architectural Details: New England Archived 2020-01-11 at the Wayback Machine", Dover, Kohl & Partners, May 26, 2011; accessed 2012.04.23. http://doverkohl.blogspot.com/2011/05/architectural-details-new-england.html
Howard Frank Mosher, A Stranger in the Kingdom Archived 2019-12-15 at the Wayback Machine, Houghton Mifflin Co., New York, 1989 (republished 2002), p. 46. https://books.google.com/books?id=Y4bLstlIhTMC&q=Howard+Frank+Mosher,+A+Stranger+in+the+Kingdom
Justin Falango, "Architectural Details: New England Archived 2020-01-11 at the Wayback Machine", Dover, Kohl & Partners, May 26, 2011; accessed 2012.04.23. http://doverkohl.blogspot.com/2011/05/architectural-details-new-england.html
Catasterist, Free & Clear (and also witch windows) Archived 2011-07-08 at the Wayback Machine, September 2010. Accessed 2010.12.14. http://catasterist.com/2010/09/free-clear-and-also-witch-windows/
Justin Falango, "Architectural Details: New England Archived 2020-01-11 at the Wayback Machine", Dover, Kohl & Partners, May 26, 2011; accessed 2012.04.23. http://doverkohl.blogspot.com/2011/05/architectural-details-new-england.html
George Nash, Renovating Old Houses: Bringing New Life to Vintage Homes. The Taunton Press, Newtown, Connecticut, 2003, p. 8.
Kathryn Eddy. Building Blocks: Exploring witch windows Archived 2020-04-07 at the Wayback Machine Barre Montpelier Times Argus. July 30, 2012. https://www.timesargus.com/news/building-blocks-exploring-witch-windows-in-vt/article_e688c115-858d-5cd7-9c53-5228b9e25e40.html
Amy Kolb Noyes, "What's the History of Vermont's 'Witch Windows'? Archived 2017-07-18 at the Wayback Machine", Vermont Public Radio, July 12, 2017. http://digital.vpr.net/post/whats-history-vermonts-witch-windows#stream/0
Vermont--diagonal "witch windows" in houses Archived 2012-03-20 at the Wayback Machine "The Straight Dope". http://boards.straightdope.com/sdmb/showthread.php?t=162427
See Matt Sutkoski, "Vermont is hot, but not like elsewhere", Burlington Free Press, August 5, 2010.[dead link] http://www.burlingtonfreepress.com/article/20100805/NEWS05/100805024/Vermont-is-hot-but-not-like-elsewhere
George Nash, Renovating Old Houses: Bringing New Life to Vintage Homes. The Taunton Press, Newtown, Connecticut, 2003, p. 8.
"Weird Window Brewing", Vermont Brewers Association; accessed 2021.08.16. https://www.vermontbrewers.com/breweries/weird-window-brewing/