I do have weather recorded daily from "my guys" in the company that I am researching (those who kept journals, mainly). I've been looking for that weather information, is there more than just the Gettysburg weather info out there?
Probably but I would say they would come from private individuals who kept such records for their own reasons. College professors or others of a like mind for scientific purposes. It can be hard to find weather observations for certain areas. unless somebody made observations for private reasons or the odd newspaper article.