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To calculate the anomaly of a variable (temperature, for example) I need the climatology (at least 30 years) of that variable. Which climatology data source should I use? Should I use the "climatology" of the weather forecasts? In this case, does the fact that the versions of the models have changed, and each model has a bias, interfere with the quality of the result? I have already read that it is not correct to use CFSR data to calculate the anomaly since 2011. I would like someone with experience in the area to explain the best way to calculate the anomaly for (GFS/GFS) forecasts. And where it is possible to obtain the climatological data for this calculation. Thank you very much in advance.

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  • $\begingroup$ To make this question better, (1) Please spell out your acronyms. (2) With respect to I have already read that it is not correct to use CFSR data to calculate the anomaly since 2011: Please give a link and/or a reference. $\endgroup$ – David Hammen Aug 25 at 6:42

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