We discuss the criteria and some results on the total ozone chronology generalization. The chronology discussed has been reconstructed from 200-year dendrochronological data for Eurasian subarctic regions. The algorithm of minimizing temperature sensitivity of the dendrochronological signal is proposed in separately analyzing its main components using "Caterpillar" software package. This paper presents data of dendroclimatic monitoring and some results on reconstructed total ozone content in the atmosphere near Tomsk city.