We are currently experiencing technical difficulties with weather forecasts. We are sorry for any inconvenience.

Science news archive

« Back

When the climate warms the growing seasons also become longer and thermal time sums grow

When the climate warms the growing seasons also become longer and thermal time sums grow

Climate warming lengthens growing seasons and increases the thermal time sum accumulated during the growing season. A recent study has estimated how growing seasons in Finland and the rest of Europe will develop in future. The calculations are based on results of over 20 climate change models. If the scenario RCP8.5 based on large greenhouse gas emissions were to realise, the growing season would be extended by approximately two months in one hundred years and the thermal time sum would increase by 800–1,000 degree days.

More information:

Kimmo Ruosteenoja, tel. +358 29 539 4128, kimmo.ruosteenoja@fmi.fi<

Kimmo Ruosteenoja, Jouni Räisänen, Ari Venäläinen ja Matti Kämäräinen, 2015: Projections for the duration and degree days of the thermal growing season in Europe derived from CMIP5 model output. International Journal of Climatology. DOI: 10.1002/joc.4535.




The Finnish Meteorological Institute is a leading expert in meteorology, air quality, climate change, earth observation, marine and arctic research areas. FMI is in a unique position to study various themes of climate change in the Northern context.


High-quality observational data and research is utilized to develop services to benefit our everyday life. Visible examples are improvement of weather forecasts, development of new expert and warning services as well as applications of the newest research results.