On the basis of the data gathered by the Research Centre for Varieties of Cultivated Plants (COBORU) of the Central Statistical Office and the Institute of Meteorology and Water Management in the period of 24 years (1972-1995) the influence of agrometeorological factors on potato crop yields in different parts of Poland was estimated, both in experimental research and in the production. The thermal conditions of the air in May, in August and in the period from 11th July to 10th August, the precipitation conditions in the following periods: 21st March-10th May, 21st April -30th June, 11th August-30th September, and also the extreme levels of soil moisture in the period from 21st June to 20th August expressed by means of the Wug index, had the largest influence on the potato crop yields. A larger effect of the moisture conditions than the thermal ones were observed in nearly all the examined provinces. Thermal factors were more significant only in Malopolska, Mazovian and Lublin provinces. Similar results were obtained in the experimental conditions in which region IV that of the largest influence of the air temperature on the potato crop yields, corresponded on the whole, to a part of the area of the Mazovian, Lublin and Lodz provinces. The contribution of agrometeorological factors to variability of the potato crop yields in experimental conditions varied from about 20% in the south-western part of Poland to 60% in the mid-eastern part, whereas in the production conditions it varied from about 40% in the southern part of the country to nearly 80% in the north-western part.