By Paul Homewood
Climate At A Glance
November Temperature
Alabama
Yesterday, WUWT picked up the story of how the NCDC have been cooling past temperatures in the US, thereby creating a warming trend. Essentially the state temperatures now shown by NCDC are lower than the originally recorded ones, which are still available online.
The explanation given is that “they changed from the ‘Traditional Climate Division Data Set’ (TCDD) to a new ‘Gridded Divisional Dataset’ (GrDD) that takes into account inconsistencies in the TCDD. “. (In simple terms, the old system simply averaged together all stations in a state, ignoring any potential weighting issues, where there was, for instance, a preponderance of stations in one particular area, or in warmer cities. The new system allows for the full area of each state to be adequately represented).
This sounds fine in theory, but how does it all work…
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The Delinquent Teenager
Climate Ponderings 