No. It isn't "snow". We get "snow" when it is 35 degrees. It is sustained and prolonged cold. The colder the worse. The longer it goes the worse. The more wind you have, the worse. One of the issues is that the stadium has to be drained of water including urinals and toilets for fans, teams, and media. This is not a trivial exercise.
Redoing/remodeling the plumbing for the entire stadium and being able to keep them from freezing is a huge issue.
I had TWO homes pipes burst two years ago on Xmas eve. It went down to 8 degrees, which it commonly does in my areas once or twice a winder. But in this case, it was prolonged with two full days of 25 mph winds. So the walls could not withstand both the cold temp and wind draining the heat from the outside walls where plumbing was done several decades ago.
It is very possible that PSU plays a home game in late December with single digits. Previous to this year, the latest we would play is Thanksgiving weekend. According to this, the average temps for Nov 25th are between 45 and 28 for the 90th percentile. it moves to 43 and 15 on December 21st.
And don't forget daylight savings time is in early Nov making nighttime temps at 5:30 pm instead of 6:30 pm. That makes a night game, even a 4:00 pm afternoon game, a challenge temperature-wise. Lastly, don't forget, updates take years in terms of planning, funding, and executing. If the NCAA decided to move home games for playoff contenders in the quarter finals, they wouldn't have time to adjust the stadium. So it is best to winterize it and prepare for any and all eventualities.
In State College during November average daily high temperatures decrease from 55°F to 43°F and the fraction of time spent overcast or mostly cloudy increases from 47% to 55%.
weatherspark.com