Abstract <p>The work studies the thermal regime of the middle atmosphere based on results of lidar monitoring of the atmosphere over Tomsk in winter 2023/24. For that period, 90 temperature profiles were calculated from lidar returns of molecular (Rayleigh) and spontaneous Raman scattering in the altitude range from 10 to 70 km. The annual cycle of the vertical temperature distribution (VTD) is characterized by stratospheric warmings in winter, their destruction in spring, and VTD stabilization in warm season and destabilization in fall when transiting to the winter stratospheric warming phase. The vertical temperature distribution in April–October mainly well agrees with the model distribution. Our results are interesting for understanding climate changes in Western Siberia.</p>