In PA, especially in the winter months, you would probably be much happier with a bigger windshield, like the National Cycle Plexistar 2 (um, the one I use), or its bigger brother--the Plexifairing 3.
A larger windshield has many advantages: protection from wind (and thus, wind chill factor), protection from wind noise (both reducing rider fatigue), protection from small or large (ouch!!!) insects, protection from the occasional loose piece of gravel that gets thrown at you (mega-ouch!!!), and of course, protection from rain (you'll get caught out in it, sooner or later).
Fortunately, judging from the posts on this website, a number of worthy windshields apparently fit our bike.
You can start a search for one, by visiting National Cycle's website:
or "Memphis Shades"...
Be very careful with what you use to clean your windshield...some cleaners can discolor it (permanently)...and I wouldn't use anything more abrasive than a cotton cloth.