FEATURES OF THE DYNAMICS OF SEASONAL DEVELOPMENT OF NATURE IN SAINT PETERSBURG IN 2021

Abstract

The abnormally warm and dry summer was the main feature of the year 2021. The average temperature of June (21,4) was the record for the whole period of instrumental meteorological observations since 1752. The phenological anomalies were evident first of all in the early dates of phenostages of the year, since the third stage of subseason "Height of Spring" till the first stage of subseason "Abatement of Summer", and especially very early dates of subseason of "Full Summer", which became the record or close to record ones. So, the warming of the climate of Saint Petersburg is continuing and strengthening. In such condition after the winter 2020/21 the majority of trees and shrubs in Peter the Great Botanic Garden (Saint Petersburg, Russia) survived the winter without damages or with small damages not more than half of annual growth. The summer drought, accompanied by hot weather, caused the early yellowing and falling of leaves on many trees and shrubs which happened to be not hardy to drought. The phenological monitoring and timely publishing of results of observations is of important significance in conditions of climatic changes.