August 16, 2016:
The ECMWF M-climate is being implemented as the climatology for anomaly plots including 2-m dew point, 2-m temperature, and precipitable water [for ECMWF products only]. The mis-match between NCEP CFSR and ECMWF based variables is too great to reliably determine anomalies at elevation or over diverse terrain.
June 27, 2016:
As part of the ECMWF upgrade to the new, advanced Cycle 41r2, hindcasts or historical re-forecasts are generated 2x per week using 11-members out to 46-days. To create a model-based climate or M-Climate, we take a 1x2x1 weighted approach of 1-week's worth of re-forecasts (660-members). The ensemble mean anomalies are then easily visualized on the global grid for large-scale patterns like Z500 and T850. New page Link
Note, this is already done with the CFSv2 model-based climate for anomalies.