Abstract. - Considerations on the thermal conditions in the Reghin Hills. Knowledge regarding the thermal conditions of the air presents a theoretical and practical importance through the influence it has over the other elements of the climate (the rainfall in the atmosphere, the air humidity) as well as on some socio- economical activities.This paper represents an analysis of the parameters which define the thermal conditions in the Reghin Subcarpathians with a special view on the annual and monthly variations of air temperature, and the establishment of the thermal conditions over years and months based on the Hellmann criterion. With a view to the establishment of the vulnerability of the analyzed territory we proceeded to estimate the annual and monthly frequency of the days with different thermal characteristics: the frequency of days with a minimum temperature of ≤ - 10°C, with a minimum temperature of ≤ 0C°; with a maximum temperature of ≥ 25C° and with a maximum temperature of ≥ 30C°. The analysis of the parameters which define the thermal conditions in the Reghin Hills was realized on the basis of the data recorded at the two meteorological stations existing in the studied area, the Târgu-Mures Meteorologic Station (φ = 46°32', λ = 24°32', H = 308 m) and the Batos Meteorologic Station (φ = 46°54', λ = 24°39', H = 449 m) for the 1978-2008 interval.
Keywords: thermal conditions, the variation in the air temperature, extreme temperature, vulnerability, risk.