Cold-season temperature parameters (average January and winter temperatures) in the northern permafrost zones of Russia for three different periods between 1930-2017

Distribution of the current mean January and mean winter temperatures near the places of determination of the isotopic composition of ice wedge veinlets for three periods: a) from 1930 to 1966, b) from 1967 to 2000, c) from 2001 to 2019 (after Vasilchuk, 1992 for the period 1930-1966). The values δ¹⁸O veinlets for the period of 1930-1966 years were used