What was the weather like in Pennsylvania in the early days?

Little evidence about 17th century weather in PA exists in large part because the land was home to native peoples who did not keep journals.

Inferences can be made from the documented severe winter weather conditions in Europe during the 70 years from 1645 until 1714 when early astronomers reported almost no sunspot activity.

The lack of sunspots is associated with the Maunder minimum during the so-called 'Little Ice Age.' Weather conditions in North America were likely similar to weather conditions in Europe where winters were bitterly cold.

Image: 400 years of sunspot observations
.

weather was slightly cooler
it was more forested and sparsely populated
Native Americans lived almost everywhere and Europeans only lived in and around Philadelphia