The first two parts of this series (Klevberg and Oard, 2011a, 2011b) introduced methods of studying past climate change, the historicity of the Medieval Warm Period and Little Ice Age, and the importance of the Little Ice Age in understanding climate change and constraining climatic models. The third part (Klevberg and Oard, 2012) provided more detailed reasons for concentrating on the North Atlantic region and summarized the rich climatic and glaciologic history of Iceland. Our study of the effects of the Little Ice Age in the North Atlantic region continues with this paper, which presents a summary of climate change indicators and the history of the Little Ice Age in Norway.