Cooling and heating degree days by country - annual data

In 2025, Ireland's cooling and heating degree days by country decreased by 5.8% compared to 2024, reaching 2,465.

Ireland accounts for 87.2% of the EU-27 total of 2,828.

Ireland ranks 17th 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 10.8% (from 2,763 in 2020).

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