Fall is football season, and sororities typically have lots of events this time of year. If you want the quintessential college experience like that, then you should definitely choose fall semester. However, the universities on your list are not similar at all, and each one would have a very different experience.
You said: The options that I’m interested in are:
-Arizona State University
-North Carolina State University
-Pennsylvania State University
-University of Arizona
-University of North Carolina at Chapel Hill
-University of Missouri-Columbia
-University of Oklahoma
-Boston College
Arizona is a warm state, and the entire climate, scenery and culture there are different than the “typical” American place, unless what you are after is the typical Southwestern experience. Arizona State and U of Arizona are essentially in the desert, with significant cultural influence from Mexico affecting everything from the food to the architecture and general vibe. I love Arizona, but it is not typical, and if you are trying to avoid modern buildings as you say, and are seeking the more traditional-looking campus, then those universities are not for you.
Boston College is a private Catholic college. While it is a typical Catholic college, I wouldn’t say it is reflective of the typical American (public) university experience. Probably not the best choice if you are after that quintessential experience, unless you are eager to be in metro Boston area to explore the city and be able to hop on a train and visit other cities in the Northeast (or go on a snow skiing trip North of there).
North Carolina State University is not a “flagship” university, and also does not have the classic American campus and experience.
That leaves on your list the following top prospects for a Fall Semester that will be closest to typical American college experience as you can get: Pennsylvania State U, U North Carolina, U Missouri, and U Oklahoma.
Oddly, you claim to love “Midwestern” towns and states, yet you don’t include a single university in the Midwest in your list aside from U Missouri. If that is to avoid the cold, then you will need to take Pennsylvania State and U Missouri off your list, because it is also cold and snowy in those locations.
That leaves you with these two options: U North Carolina, and U Oklahoma. Both of them have Sorority Houses, so either choice would do, but UNC is the more highly ranked university, and Chapel Hill is often voted the best college town in America. That means University of North Carolina- Chapel Hill is your best choice to provide the experience you seek.