Cooling and heating degree days by country - annual data

In 2025, Slovenia's cooling and heating degree days by country increased by 5.8% compared to 2024, reaching 2,599.

Slovenia accounts for 91.9% of the EU-27 total of 2,828.

Slovenia ranks 14th out of 27 EU member states with reported data — in the bottom half of the distribution.

Over the past five years, the indicator has fallen by 3.0% (from 2,678 in 2020).

Source: Eurostat dataset nrg_chdd_a, accessed via the eupublicdata pipeline.