warmth centered on 1500–1600, a 1°C cooler period centered on 1300, and consistently warmer conditions prior to this (with temperature at A.D. 1 being approximately 1°C warmer than the late 20th century). There was no apparent warming during medieval times at this site. Uncertainties on these results for earlier time periods are on the order of a few tenths of a degree Celsius for averages over a few centuries.
The National Academies of Sciences, Engineering, and Medicine
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Surface Temperature Reconstructions for the Last 2,000 Years.
Washington, DC: The National Academies Press, 2006.
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