The Field at Bills' stadium clear, but snow still covers the stands

https://www.espn.com/nfl/story/_/id/39314436/sun-crews-busy-digging-snow-covered-stadium-bills-playoff-game-vs-steelers

Such stadiums in colder climates are better off to have some kind of a covering. Of course a fully enclosed structure is even better.

https://www.foxnews.com/sports/shirtless-bills-fan-slides-down-chute-shovels-snow-highmark-stadium

https://www.buffalobills.com/news/stadium-news

https://deadspin.com/buffalo-bills-highmark-stadium-need-a-dome-1851166729

https://en.wikipedia.org/wiki/Highmark_Stadium_(New_York)#Finding_a_new_place_to_call_home

https://en.wikipedia.org/wiki/New_Highmark_Stadium

https://www.profootballnetwork.com/list-of-indoor-and-outdoor-nfl-stadiums-how-many-nfl-stadiums-are-domed/

https://en.wikipedia.org/wiki/Category:Covered_stadiums_in_the_United_States

https://en.wikipedia.org/wiki/List_of_covered_stadiums_by_capacity#Field_sports

https://en.wikipedia.org/wiki/List_of_covered_stadiums_by_capacity#Under_Construction