Code for Approximating the universal thermal climate index (UTCI) using sparse regression with orthogonal polynomials

This repository contains the code and data associated with the article: “Approximating the Universal Thermal Climate Index using Sparse Regression with Orthogonal Polynomials”, available on arXiv: https://arxiv.org/abs/2508.11307

The Universal Thermal Climate Index (UTCI) offset data used in this study were originally published as supplementary material to:
Bröde, P., Fiala, D., Błażejczyk, K., et al. (2012). Deriving the operational procedure for the Universal Thermal Climate Index (UTCI). International Journal of Biometeorology, 56, 481–494. https://doi.org/10.1007/s00484-011-0454-1

We do not redistribute this dataset. Users may obtain it directly from the publisher’s website. Our accompanying script provides an automated download function that retrieves the file from the official source; users access the data under the publisher’s terms.

For additional testing, a separate dataset is included that is published under a CC-BY-4.0 license: https://zenodo.org/records/5503968