Quantitative traits (plant height, number of leaves, head diameter, number of achenes per head, achene weight per head thousand seed weight, hectolitre mass of seed and seed yield) of 25 sunflower hybrids, created within AMG-Agroselect Comert LLC were analyzed. Homogeneity of individuals, relative contributions of genotype, environment and genotype environment interaction in determining the variance of the respective traits in different climatic conditions of two growing season (2019, 2020), were assessed. Some traits such as the head diameter and the number of leaves has practically not changed, and the hectolitre mass even registered a slight increase in 2020 compared to 2019. The parameters achene weight per head and number of achene per head, followed by seed yield have the highest degree of variation related to growing season. The drought conditions in 2020 also caused a decrease in the phenotypic uniformity of sunflower populations according to various traits. Coefficient of variation (CV) of the individuals of a population according to the achene weight per head, registers an increase of almost 6 times, in 2020 compared to 2019. The analysis of variance showed that the achene weight per head, number of achenes per head, seed yield and plant height traits is determined to a greater extent by environmental conditions (E) than by genotype (G). A higher stability of most traits was established for 2019 compared to 2020, which is explained by the unfavorable climatic conditions manifested in 2020.