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. 2021 Sep 1;8:229. doi: 10.1038/s41597-021-01010-w

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© The Author(s) 2021

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Fig. 8 — Averaged daily mean (left column), maximum (middle column), and minimum (right column) of the thermal indices for January during the period 1981 - 2019. Only essential indices suitable for cold conditions are illustrated. UTCI2 refers to the indoor UTCI, which uses two parameters, and UTCI3 stands for the outdoor shaded UTCI, which takes three parameters for the calculation.