STUDY OF THE TIME SERIES SPECTRA OF MEAN ANNUAL AIR TEMPERATURES OF THE CITIES OF MOSCOW AND ST. PETERSBURG
The time series spectra of the average annual air temperatures of the cities of Moscow and St. Petersburg in the time interval from 1821 to 2020 have been studied. Sample spectral densities (periodograms) and sample spectral functions (cumulative periodograms) of temperature time series data, as well as their model and residual components within the framework of the model , are calculated using application software packages of the computer environment R.