The building maintenance scheduled for Friday February 27th at 5:00pm MST has been postponed until 5:00pm March 6th. PSD's website will be down during the maintenance.
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Twentieth Century Reanalysis (V1): Summary
The 20th Century Reanalysis V2 is available. Please go to http://www.esrl.noaa.gov/psd/data/gridded/data.20thC_ReanV2.html