Cyclic Temperature and Precipitation Fluctuations in Poland in the 19th-21st Centuries

The objective of the work is to determine the periodicity and trends of change in air temperature and precipitation in Poland in the time period of the 18^th-20^th centuries, together with the forecast for the 21^st century. There are interesting diagrams of the temporal changes of solar activity and North Atlantic Oscillation (NAO) indicator, with the forecast reaching the year 2100. The forecasts were obtained on the basis of interpretations of the Wolf number and NAO indicator cycles, determined with the method of “regression sinusoids”. The fluctuations of the air temperature and precipitations during winter in Warsaw and in Cracow are closely correlated.