Over the past decades there has been an in-crease in the amplitude of air temperature fluctua-tions. Forest ecosystems possess considerable stability and are capable of maintaining dynamic balance in a wide criteria range. The pine is a common forest variety in the European North of Russia. Tree reactions to environmental conditions in the north are manifested earlier and more pro-nounced. Radial increase is a complex indicator, allowing tracing the change in the state of the stand and climate. In pine forests on marshy peaty peat soils of the basin of the river of Mezen (Arkhan-gelsk Region) the studies on the variability of radial growth of Pinus sylvestris L. taking into account the climate were conducted. The method of the den-drochronological analysis received chronological ranks of radial gain of the pine for a long period. High amplitude of the oscillations of pine growth index was established. According to the “sensitivity index” of individual series of the pine high values indicating the response of trees to excessive soil moistening were not established. The dynamics of “stress index” as readapting factor was positive and corresponded to the average level (past 30 years). The ranks of average annual air temperature, the amount of precipitation were analyzed and the trend in the increase in these parameters was es-tablished (on meteorological station "Mezen"). The correlations between radial growth and air tempera-ture and the amount of precipitation of the previous and current year have not been revealed. Reliable correlation links have been established between relative sizes of the gain, average monthly tem-perature of August and the amount of precipitation of March for different periods of time positively in-fluencing cambial growth of the pine in the condi-tions of constant excessive moistening of soils on northern border of the area.