Primary processed experiment data output from 20 OpenIFS experiments used in "How do stratospheric perturbations influence North American weather regime predictions?" (Lee et al., submitted to J. Climate). Date in file string corresponds to initialisation date. Each netCDF file contains: Valid time 500 hPa geopotential heights and anomalies for both control run & polar stratosphere relaxed runs North American principal component loadings for control & relaxed runs Daily North American regime attribution for control & relaxed ensembles, and regime of ensemble mean (0 = ArH, 1 = ArL, 2 = AkR, 3 = PT) 100 hPa 60N zonal-mean zonal winds in control & relaxed ensembles Ensembles contain 21 members, where member 0 is the unperturbed member.