This dataset contains processed land-based meteorological variables and marine reanalysis data used to identify coupled land–sea climate regimes using the Bootstrap-Guided Iterative Clustering Refinement (BGICR) framework. The data are derived from publicly available observational sources (Open-Meteo) and reanalysis products (ERA5) and were harmonized, standardized, and filtered for the purpose of unsupervised climate regime discovery. The dataset supports the analysis presented in the associated manuscript and is provided under restricted access during peer review.