Medieval Warm Period Climate Transition

Timeline

1. 901–950Greenland · GreenlandOxygen isotope records from Greenland ice cores and tree-ring width analyses show rising Northern Hemisphere temperatures in the mid-to-late 10th century, marking the end of the Early Medieval Cold Period and the beginning of the Medieval Warm Period. Arctic sea ice extent shrank, creating conditions for high-latitude navigation.
2. 920–1000Western Europe · Western EuropeClimate warming shifted Europe's grape-growing belt northward and lengthened the growing season, with higher agricultural output supporting population growth. Norse Vikings exploited reduced sea ice to colonize Iceland and Greenland, and sailed as far as Vinland in North America, closely tied to the global warming at the end of the 10th century.
3. 950–1000Jianghuai region, China · ChinaChinese climate historical records show that in the late 10th century the Jianghuai region had a warmer and more humid climate, the northern limit of citrus and other subtropical crop cultivation advanced, and the frequency of Yellow River floods changed. Migration patterns of nomadic peoples on the Eurasian steppe were also affected by climate, with an environmental background link to 10th-century political changes such as the rise of the Khitans.