Аннотация:We calculated the variations of Rayleigh optical depth with changes of pressure and temperature for three observation sites: Simferopol (φ = 44°57'N, λ = 34°8'E, h = 265 m above sea level), Nauchny (φ = 44°43'N, λ = 34°3'E, h = 583 m), and Ai-Petry meteorological station (φ = 44°24'N, λ = 34°6'E, h = 1180 m).