Abstract: This dataset contains 6-hourly instantaneous categorial data of the Lamb circulation types (Lamb 1972) on a 2.5 degrees longitude-latitude grid covering the northern hemisphere extratropics between 30ºN and 70ºN for the period 1979-2005. These "Lamb catalogues" were calculated for the historical experiments of 61 distinct GCMs from the Coupled Model Intercomparison Project phase 5 and 6 and for two distinct reanalyses (ERA-Interim and JRA-55). For 13 out of 56 GCMs, 72 additional runs are provided to explore the role of internal model variability.

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