Debcon,
I don't know much directly about Jamestown College, but my son played four years of baseball at North Dakota State University, a couple of hours down the road. NDSU is D1 (since 2004) and did not play Jamestown, but I've heard good things about the school and baseball program. Also, my son did play some Legion games vs. Jamestown and they have a very nice old wood grandstand ballpark that is in excellent shape, thanks to donations from Jamestown native Darin Erstad. Like other northern schools, they play farther south earlier in the season before starting home games. There will be some cold days, but baseball in North Dakota is completely feasible and I wouldn't reject the school because of worries about the weather. Good luck.