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File: ENSOblog_UpperTercileTempLimitDifference_20211119_800px.png

File name: ENSOblog_UpperTercileTempLimitDifference_20211119_800px.png
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Alternate Text: Map of US showing how the warmest third of winter temperatures has increased in the new climatology
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Map of US showing how the warmest third of winter temperatures has increased in the new climatology

Image caption

Change in temperature threshold that defines the December-February "above-normal temperature" category after updating the long-term average from the 1981-2010 period to the 1991-2020 period. Widespread increases in this threshold indicate higher normal temperatures in the new reference period because of long-term warming.