Polar low tracks over the Northern Hemisphere, for both present and future climate scenarios, with the HadGEM3-GA3 N512 global climate model simulations (UPSCALE projet). The tracking has been performed with the TRACK algorithm and the identification scheme is based on previous studies. Please read the README file for more information. These datasets support the publication: Bresson, H., K. I. Hodges, L. C. Shaffrey, G. Zappa, R. Schiemann, 2022, JGR Atmospheres: The response of Northern Hemisphere polar lows to climate change in a 25 km high-resolution global climate model. https://doi.org/10.1029/2021JD03561