Climatological data, Pennsylvania
A serial of monthly weather records for Pennsylvania issued by the U.S. Weather Bureau and its successor data services from 1896 onward, compiled for meteorologists, farmers, and state agencies. The plates are line-drawn state outline maps overprinted with county grids, station dots, division labels, and heavy hand-inked isohyet contours, offering ready-made cartographic linework, contour patterns, and small typographic keys.







