*Article* **Summer Drought in 2019 on Polish Territory—A Case Study**

**Agnieszka Ziernicka-Wojtaszek**

Department of Ecology, Climatology and Air Protection, Faculty of Environmental Engineering and Land Surveying, University of Agriculture in Kraków, al. Mickiewicza 24/28, 30-059 Kraków, Poland; agnieszka.ziernicka-wojtaszek@urk.edu.pl

**Abstract:** The summer 2019 drought in Poland, i.e., the warmest year in observation history, was characterized. Meteorological, agricultural, hydrological, and hydrogeological aspects were taken into account. Meteorological drought in the light of regionally differentiated days of low precipitation frequency lasted the longest, i.e., over 3 months in central-western Poland. In the period between June– August 2019, in the belt of South Baltic Lakes and Central Polish Lowlands, the lowest precipitation sums of 30–60% of the norm were recorded. The values of the climatic water balance (CWB) calculated by the Institute of Soil Science and Plant Cultivation (IUNG) method for individual months of June– August for the Polish area were −129, −64, and −53 mm, respectively. The most threatened were fruit bushes, spring cereals, maize for grain and silage, and leguminous plants. In central-western and south-western Poland, the drought accelerated the date of the lowest flows by two months on average from the turn of September and October to the turn of July and August. In the lowland belt, where the drought was the most intensive, the average monthly groundwater level, both of free and tight groundwater table, was lower than the monthly averages for the whole hydrological year.

**Keywords:** precipitation; precipitation deficit; climatic water balance; drought

**Citation:** Ziernicka-Wojtaszek, A. Summer Drought in 2019 on Polish Territory—A Case Study. *Atmosphere* **2021**, *12*, 1475. https://doi.org/ 10.3390/atmos12111475

Academic Editors: Alfredo Rocha and Ognjen Bonacci

Received: 24 September 2021 Accepted: 3 November 2021 Published: 8 November 2021

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