This synthesis paper summarizes published proxy climate evidence showing the spatial and temporal pattern of climate change through the Holocene in Arctic Canada and Greenland. 

From NOT A LOT OF PEOPLE KNOW THAT

By Paul Homewood

I came across this paper again the other day. It’s from 2016, but still highly relevant:

It’s quite a powerful study because of its wide geographical coverage, unlike other studies that focus on one particular proxy in one location.

Below is the key graph. It’s measured in SDs, but illustrates how temperatures plunged around 3000 years ago, and notably since the Middle Ages:

Figure 2 also shows the area of the Greenland ice sheet, which reached post ice age minimum about 4000 years ago, and was at a maximum at the end of the Little Ice Age: