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The aim of the study is to characterize the long‐term variability of the low‐level cloud base heights (CBH) in Poland in the years 1971–2020. Data were used from six weather stations belonging to the Institute of Meteorology and Water Management – the National Research Institute (IMWM‐NRI), where CBH was first measured using the IWO device and, since the 1990s, using a ceilometer. The analysis allowed...