The Medieval Warm Period (MWP) is generally thought to have occurred from c. 950–c. 1250, during the European Middle Ages. In 1965, Hubert Lamb, one of the first paleoclimatologists, published research based on data

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A 2009 study by Michael E. Mann et al., examining spatial patterns of surface temperatures shown in multi-proxyreconstructions, found that evidence on the Medieval Warm Period

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Lloyd D. Keigwin's 1996 study of radiocarbon-dated box core data from marine sediments in the Sargasso Seafound that its sea surface temperature was approximately 1 °C (1.8 °F) cooler approximately 400 years ago, during the Little Ice Age, and 1700

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The 2009 Mann et al. study found warmth exceeding 1961–1990 levels in southern Greenlandand parts of North America during the Medieval Climate Anomaly, which the study defines as

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A sediment core from the eastern Bransfield Basin, in the Antarctic Peninsula, preserves climatic events from both the Little Ice Age and the Medieval Warm Period. The authors noted, "The late Holocene records clearly identify Neoglacial events of the

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Corals in the tropical Pacific Ocean suggest that relatively cool and dry conditions may have persisted early in the millennium, which is consistent with a La Niña-like configuration of the El Niño-Southern Oscillation patterns.
In 2013, a study from

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The climate in equatorial eastern Africa has alternated between being drier than today and relatively wet. The climate was drier during the Medieval Warm Period (1000–1270).

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