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In the Republic of Moldova, the sunflower is becoming a crop more and more often cultivated by farmers, having part of an environment favorable to the development on large areas of our country, however, certain meteorological situations can favor or, on the contrary, restrain the development of this crop. Thus, ensuring food security requires a stable development of agriculture by substantially increasing the degree of evaluation and capitalization of available agroclimatic resources. Climatic factors significantly influence the growth and development of the sunflower culture. The biggest effects on the production capacity are the temperature and the amount of precipitation. Thus, the contribution of meteorological factors in the climatic variability of the harvest value was determined as a correlation between the productivity value and the thermal and humidity regime using the multiple regression equation. Finally, a correlation coefficient (r) was obtained that indicates the contribution of each factor in the formation of the productivity value, the calculated error is 0.01, which allows us to ascertain the close connection between the meteorological factors and the productivity of the given crop.

Extreme climatic phenomena present risk factors for agriculture, health, constructions, etc. and are studied profoundly these past years using extreme value theory. Several relation that describe positive extreme values’ probability Generalized Extreme Value and Gumbel distribution are presented in the article. As a example, we show the maps of characteristic and reference values of the maximum depth of the frozen soil and thickness of hoar-frost with a probability of exceeding per year equal to 0,02, which is equivalent to the mean return interval of 50 years. The obtained results could serve as a base for elaboration of national annexes in constructions.