The climate is mostly temperate throughout the country.
Summers are generally warm, with average temperatures between 18 and 30 °C (64.4 and 86.0 °F) depending on a region.
Winters are rather cold, with average temperatures around 3 °C (37.4 °F) in the northwest and ?6 °C (21 °F) in the northeast.Precipitation falls throughout the year, although, especially in the east; winter is drier than summer.98Źródło: https://en.wikipedia.org/wiki/Poland#Climate
Tourists come to the mountain resorts especially during the winter holidays.
Such centers are adapted to the needs of single travelers and families.Although Poland is not a country known for its winter resorts, but staying in Zakopane or other mountain resorts for many people can be attractive and memorable, the more that take place in Poland more and more sporting events associated with winter sports and events related to the celebration of Carnival. Other attractions related to mountain tourism are walks in the mountains, sleigh rides and skiing lessons.
Masuria and the Masurian Lake District are known in Polish as Kraina Tysiąca Jezior and in German as Land der Tausend Seen, meaning "land of a thousand lakes." These lakes were ground out of the land by glaciers during the Pleistocene ice age around 14,000 - 15,000 years ago, when ice covered northeastern Europe.
Great geological changes took place and even in the last 500 years the maps showing the lagoons and peninsulas on the Baltic Sea have greatly altered in appearance.
The terrain is rather hilly, with connecting lakes, rivers and streams.Forests account for about 30% of the area.9798 The northern part of Masuria is covered mostly by the broadleaved forest, while the southern part is dominated by pine and mixed forests.citation needed Źródło: https://en.wikipedia.org/wiki/Masuria#Landscape.