1. The types of arriving air masses on the regions of Poland. By Adrian Budny

2. Main factors of climate. Air temperature Atmospheric pressure Humidity of air Insolation Wind Cloudiness Precipitation 3. All of the air masses that arrive to Poland. 4. Arrival of air masses in January. 5. Arrival of air masses in July. 6. Average year temperatures in Poland. 7. Average temperatures in January. 8. Average temperatures in July. 9. Bibliography: http://www.zazi.iung.pulawy.pl/Documents/Maps.htm http://www.szkolnictwo.pl/szukaj,Okres_weget acyjny http://www.wiking.edu.pl/article.php?id=36 http://krolowasuperstar.blog.pl/2012/12/18/ksiazkowyrozklad-temperatur-nad-polska/