The dataset provided here is for manuscript Enhanced jet stream waviness induced by suppressed tropical Pacific convection by Sun et al. that published in Nature Communications. Abstract: Consensus on the cause of recent midlatitude circulation changes toward a wavier manner in the Northern Hemisphere has not been reached, albeit a number of studies collectively suggest that this phenomenon is driven by global warming and associated Arctic amplification. Here, through a fingerprint analysis of various global simulations and a tropical heating-imposed experiment, we suggest that the suppression of tropical convection along the Inter Tropical Convergence Zone induced by sea surface temperature (SST) cooling trends over the tropical Eastern Pacific contributed to the increased summertime midlatitude waviness in the past 40 years through the generation of a Rossby-wave-train propagating within the jet waveguide and the reduced north-south temperature gradient. This perspective indicates less of an influence from the Arctic amplification on the observed mid-latitude wave amplification than what was previously estimated. This study also emphasizes the need to better predict the tropical Pacific SST variability in order to project the summer jet waviness and consequent weather extremes. Data source: All reanalysis data used in this study were obtained from publicly available sources: ERA5 reanalysis data can be obtained from the ECMWF public datasets web interface (http://apps.ecmwf.int/datasets/). The ECMWF ERA5.1 reanalysis product is available at https://confluence.ecmwf.int/pages/viewpage.action?pageId=181130838. Simulated global circulation, temperature and sea ice under anthropogenic forcing were obtained from the CMIP5/6 and CESM-LE archives accessed through the Earth System Grid Federation data portal (http://esgf.llnl.gov). In addition, the data generated for this paper and the CESM1 heating-imposed experiment raw output is available from the corresponding author upon request.