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The study objective was the determination of thermal conditions in Poland in 2018 on the background of the multi-annual period 1966–2018. The study was based on data obtained from the Institute of Meteorology and Water Management – National Research Institute. The research showed a statistically significant increase in mean daily air temperature in the years 1966–2018. The highest mean annual air temperature over the prevailing area in the analysed multi-annual period was recorded in 2018. In that year, mean air temperature was lower than the mean value from the multi-annual period only during 2 months (February and March). The highest anomalies of mean monthly air temperature were observed in April.
Tomczyk et al. (2019) studied this question.