Approximating the universal thermal climate index using sparse regression with orthogonal polynomials

ArXi:2508.11307v3 Announce Type: replace-cross The Universal Thermal Climate Index (UTCI) is a measure of thermal comfort that quantifies how humans experience environmental conditions. Due to its robustness and versatility as a bioclimatic indicator, it has been extensively employed across a wide range of studies in bioclimatology and is increasingly used as an operational measure of outdoor thermal comfort.