Cooling and heating degree days by country - annual data

In 2025, the EU-27 figure for cooling and heating degree days by country was 127.8 .

That is a 8.2% fell versus 2024 (139.2).

Over the five years before that, the EU-27 aggregate moved 33.8% higher.

Across member states, Cyprus reported the highest value (854.2, 2025) and Ireland the lowest (0.01, 2023) — a ratio of 85418.0× between the two ends of the range.

The figures below come from Eurostat dataset nrg_chdd_a; every value links back to the canonical source.