On the basic of long-term experiment made by the Institute of Filed Crops „Selectia” (19712011), published statistical data and meteorological reports (1945-2012) was calculated the level of the influence of environmental factors on the growth of sunflower. The most detailed calculations are given in regard to the effect of air temperature, precipitation and some of the coefficients (HTC), that integrate the effect of these factors, and the level of their correlation with the level of productivity of sunflower. Indentified: the level of infuence of these indicators, their optimal and extreme values of average annual, seasonal and average monthly data and the degree of modification of their impact in combination with other environmental factors.