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Vegetation development

As a consequence of rising temperatures, spring and summer development of vegetation is occurring significantly earlier nowadays than several decades ago. Therefore, plants are excellent indicators for the effects of the global rise in temperature. The meteorological service MeteoSwiss is collecting a variety of data to illustrate these changes.

Einsteigsbild: Blüte des Apfelbaums


Phenology is the study of cyclic growth and development phenomena occurring over the course of a year in relation to flora and fauna. In the case of plant phenology, the onset dates of the so-called pheno phases such as new leaf formation, flowering, ripening of fruit, leaf colour change and fall are observed and recorded.

Reporting on current vegetation patterns

Did vegetation start to grow especially early in a particular year due to temperatures being much higher than average? The observations of the phenological observation network  form the basis of the climatological evaluation of current vegetation patterns. Current analyses can be found in the monthly and annual retrospective reports.

Swiss phenology network

Das phänologische Beobachtungsnetz von MeteoSchweiz umfasst rund 160 Stationen. 26 Pflanzenarten werden beobachtet, um die Vegetationsentwicklung...

Monthly and annual reports

The weather service MeteoSchweiz is analysing the weather and climatic development and compiling a variety of reports such as climate bulletins,...

The spring index

The spring index shows the point of time of vegetation development in spring compared to the long-time average from 1991-2020. The annually determined index summarises the phenological spring phases, from the blooming of the hazel bush to the new leaf formation of the beech tree.

Spring index

The spring index shows the time of spring vegetation growth onset in Switzerland compared to the long-term average.

Additional phenological observation series

Aside from the observation network, two long-term and hence very valuable phenological series of observations exist in Switzerland, which have been used to observe two types of plants since 1808 and 1894 at the same location: a horse chestnut tree in Geneva and the blossoms of a particular cherry tree in Liestal.