Effective May 2, 2011, the Global Historical Climatology Network-Monthly (GHCN-M) version 3 dataset of monthly mean temperature will replace GHCN-M version 2 as the dataset for operational climate monitoring activities. Please see Summary of Recent Changes in the GHCN-M Temperature Dataset and Merged Land-Ocean Surface Temperature Analyses for information on the major changes in GHCN-M version 3.
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GHCN-M Version 2 and Version 3 temperature anomaly time series.
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