The quantity and quality of yields of cereals are dependent to a large extent on the weather conditions during the vegetation season, as well as on the development of the meteorological indicators in the autumn-winter period. These conditions, especially in Poland, cause a large variability of yielding, on average at the level of 30-40%. The aim of this study was to evaluate the impact of meteorological indicators which occurred in the autumn-winter period on the yielding of winter triticale in 1993-2013 in the region of Warmia and Mazury. Triticale is one of the main cereal plants cultivated in Poland. Its participation in the total crop structure is approx. 10%, and average yields are in the range of 3-4 t ha^–1. The following meteorological indicators were included in the study: number of days from sowing to winter period, average daily temperature from sowing to winter period, total precipitation from sowing to winter period, duration of winter period, total average daily temperature in winter period, total precipitation in winter period, duration of snow cover retention, number of days with atmospheric thaws. The impact of the examined meteorological indicators in autumn-winter period on the yielding of winter triticale was analysed statistically using the analysis of correlation and regression for one or more independent variables. In the analysed 21-year period the yields of winter triticale averaged 5.97 t ha^–1. The lowest were in 1998 – 3.78 t ha^–1, the highest – 8.83 t ha^–1 – in 2004. The conducted analyses indicate that the yield of winter triticale significantly depended only on the number of days with atmospheric thaws. The total impact on yield was mainly determined by the number of days with atmospheric thaws in winter period, average daily temperature from sowing to winter period and total precipitation in winter period.