Over 30 Polish climatologists, from a dozen or so research centers, conducted comprehensive research on changes in air temperature and precipitation, as well as time trends of other climate elements, circulation and biometeorological indicators, weather types and atmospheric phenomena.
On the basis of subsequent studies on the width of tree rings and lake sediments, it was confirmed that in the Middle Ages in today's Poland there was a warming period, called the Mediewal Warm Period, when the temperature was comparable to today. Then followed the Little Ice Age, which lasted until about 1850. The temperature of winter in this period was about 2 degrees C lower than today.
As for the changes registered in the last 70 years, among others, the advection of air from the western sector is observed somewhat more often, especially in winter. At this time of year, we receive more warm, humid air from the Atlantic, which means that winters are usually milder and we see less snow.
The air temperature has a positive trend in all seasons, with the greatest increase in value in the spring. The changes in the average annual air temperature amount to approximately 0.2-0.3 degrees C in 10 years. The positive trend of maximum and minimum air temperature is also statistically significant, especially in the last three decades of years.
The change scenarios indicate that less energy will be used to heat buildings in winter. At the same time, more energy will be needed in summer to air-condition the rooms.
As for agriculture: the growing season of plants will be longer - by 15-30 days for the scenario assuming an increase in global temperature by about 2 degrees C.
Source: PAP - Science in Poland