| Data and analysis code for Contrasting North Atlantic circulation states reorganize Greenland summer cloud radiative effects

Processed cloud-property, surface-radiation and skin-temperature data and Python calculation code accompanying “Contrasting North Atlantic circulation states reorganize Greenland summer cloud radiative effects”. The analysis covers June–August 2005–2025, with P1 defined as 2005–2014 and P2 as 2015–2025. The archive contains seasonal and period means, period differences, trends, spatial statistics, correlations and CRE-related temperature diagnostics derived from CERES, MODIS and ERA5. README.md describes the data organization, calculation scripts, dependencies and execution commands. Main-text cloud analyses use CERES; supplementary S2–S3 use Aqua MODIS, with the Terra–Aqua comparison provided for Table S1.