In order to help ensure that this web analysis page remains available, we would greatly appreciate feedback on its use, particularily in the clasroom, for presentations or for research. Mail to Cathy Smith at (cathy.smith@noaa.gov).
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The ESRL website will be unavailable for 24 hours starting Friday, March 6th at 5:00pm MT due to building maintenance.
  PSD no longer makes the V1 version of the 20th Century Reanalysis available. Please try the V2 daily composite page or access the data at NCAR.