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Updated 12 October, 2003

US National Assessment of the Potential Consequences of Climate Variability and Change Historic Climate Trends Over the Last Century

Figure 4: Trends in the annual average of selected climatic variables over the US during the 20th century as derived from observations compiled in the HCN data set. (a) Temperature (oF/century); (b) Precipitation (percent change/century); (c) Palmer Drought Severity Index (percent change/century).

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