Despite continuous technological development, lack of data or discontinuity in meteorological measurements is still an issue affecting many stations. This study was devoted to determining the bioclimatic conditions in the Klodzko region (SW Poland), where meteorological measurements have been discontinuous since 2006. Four stations with continuous measurements were analyzed. These localities are situated at Klodzko and its health resorts. Bioclimatic conditions were determined using the Universal Thermal Climate Index (UTCI). The study of variability in UTCI was performed in different circulation epochs. Additionally, a non-linear model for SW Poland was used to reconstruct the long-term trend of air temperature in the Klodzko region. Verification of this model was performed on the basis of own air temperature measurements in the period from April 2017 to March 2022. Analysis of thermal conditions in circulation phases showed higher air temperatures and UTCI values in epoch W (1989-present) compared to epoch E (1966-1988) at all analyzed stations. The non-linear model of meteorological data showed its applicability for data reconstruction in the region with an accuracy of about 67%. Further modification of the model may serve to increase its applicability to other locations in Europe or North America.