Since then, it is the highest temperature ever recorded in any city located in present-day Poland (the town was then a part of Germany).

[citation needed] From the 14th century onwards the estates were held by the Prószkowski (also known as Pruskowski, Pruskovsky, von Proskau) noble family.

After the First Silesian War the town passed from Bohemian sovereignty and became part of Prussia in 1742 under the Germanized name Proskau.

[4] After the death of Count Leopold von Proskau in 1769 his estate (including the manufacture) passed to Karl Maximilian, Prince of Dietrichstein, which moved its most valuable collections, including the library, treasury and archive, to another location in then Austria in 1782,[5] and eventually sold the estate to the Prussian king Frederick the Great in 1783.

The succeeding institute for pomological research, founded in 1868,[7] including an arboretum and extensive orchards, exists up to today.