Cooling and heating degree days - Regions in Ireland

Ireland: Cooling and heating degree days - Regions was 1,664 Degree days in 2023. β–Ό Falling

Latest (2023)
1,664 Degree days
Change on year
down 6.3%
World rank
28th
of 48 countries
All-time high
2,425 Degree days
in 1986
All-time low
1,664 Degree days
in 2023
Years of data
43
1981–2023

Cooling and heating degree days - Regions in Ireland, 1981–2023

05001.0k1.5k2.0k2.5k1981200220231981: 2.1k Degree days1982: 2.1k Degree days1983: 2.0k Degree days1984: 2.1k Degree days1985: 2.3k Degree days1986: 2.4k Degree days1987: 2.2k Degree days1988: 2.0k Degree days1989: 1.9k Degree days1990: 1.9k Degree days1991: 2.1k Degree days1992: 2.1k Degree days1993: 2.1k Degree days1994: 2.0k Degree days1995: 2.0k Degree days1996: 2.2k Degree days1997: 1.8k Degree days1998: 1.9k Degree days1999: 1.9k Degree days2000: 2.1k Degree days2001: 2.1k Degree days2002: 1.9k Degree days2003: 1.9k Degree days2004: 1.9k Degree days2005: 1.9k Degree days2006: 1.9k Degree days2007: 1.7k Degree days2008: 2.0k Degree days2009: 2.1k Degree days2010: 2.4k Degree days2011: 1.9k Degree days2012: 2.0k Degree days2013: 2.1k Degree days2014: 1.9k Degree days2015: 2.0k Degree days2016: 2.0k Degree days2017: 1.8k Degree days2018: 2.0k Degree days2019: 1.9k Degree days2020: 1.9k Degree days2021: 1.9k Degree days2022: 1.8k Degree days2023: 1.7k Degree days

Source: Organisation for Economic Co-operation and Development. Measured in Degree days.

Analysis

In 2023, cooling and heating degree days - regions in Ireland stood at 1,664 Degree days. That is the lowest value across all 43 years on record.

Compared with earlier readings it is down 6.3% on the previous year and down 20.6% over ten years.

Over the whole period, cooling and heating degree days - regions in Ireland peaked at 2,425 Degree days in 1986 and was at its lowest, 1,664 Degree days, in 2023.

Ireland ranks 28th of 48 countries on this measure, in the middle of the range.

The long-run direction has been consistently falling across the 43 years of available data.

Averages by decade

DecadeAverage LowestHighest Years
1980s 2,130 Degree days 1,932 Degree days 2,425 Degree days 9
1990s 1,991 Degree days 1,808 Degree days 2,185 Degree days 10
2000s 1,936 Degree days 1,740 Degree days 2,060 Degree days 10
2010s 2,011 Degree days 1,835 Degree days 2,415 Degree days 10
2020s 1,808 Degree days 1,664 Degree days 1,907 Degree days 4

Countries ranked near Ireland

  1. 25 Hungary 1,758 Degree days compare
  2. 26 Belgium 1,735 Degree days compare
  3. 27 Bulgaria 1,728 Degree days compare
  4. 29 Netherlands 1,657 Degree days compare
  5. 30 Croatia 1,618 Degree days compare
  6. 31 Italy 1,563 Degree days compare

See the full ranking of 52 places β†’

More reference data data for Ireland

All data for Ireland β†’

Frequently asked questions

What is cooling and heating degree days - regions in Ireland?
Cooling and heating degree days - regions in Ireland was 1,664 Degree days in 2023, according to Organisation for Economic Co-operation and Development.
What is the highest cooling and heating degree days - regions recorded in Ireland?
The highest recorded value was 2,425 Degree days in 1986.
What is the lowest cooling and heating degree days - regions recorded in Ireland?
The lowest recorded value was 1,664 Degree days in 2023.
How does Ireland rank for cooling and heating degree days - regions?
Ireland ranks 28th out of 48 countries with data for 2023.
Is cooling and heating degree days - regions rising or falling in Ireland?
Over the last ten years it is down 20.6%. The long-run trend across the full record is falling.
Where does this Ireland data come from?
The figures come from Organisation for Economic Co-operation and Development, published as part of Cooling and heating degree days - Regions. Statizoid updates them automatically from the source API.

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CSV Β· JSON β€” 43 observations, free to reuse under OECD Terms and Conditions (attribution required).

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Cooling and heating degree days - Regions in Ireland. Statizoid, drawing on Organisation for Economic Co-operation and Development. Retrieved 17 August 2026, from https://reference.statizoid.com/stat/cooling-and-heating-degree-days-regions/ireland/

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About this data

Indicator
Cooling and heating degree days - Regions
Unit
Degree days
Source
Organisation for Economic Co-operation and Development
Licence
OECD Terms and Conditions (attribution required)
Coverage
52 places, 2,236 data points, 1981–2023
Last refreshed

<p style="text-align: justify;">This dataset provides indicators on Cooling and Heating Degree Days, in large (TL2) and small (TL3) regions.</p> <p><strong>Data definition and source</strong></p> <ul> <li>Cooling Degree Days (CDD) quantify how hot a given period was, indicating the energy demand for cooling buildings. CDD is calculated as the sum of the differences between the daily mean temperature and a reference temperature of 22&deg;C, for all days when the mean temperature exceeds 22&deg;C.</li> <li>Heating Degree Days (HDD) quantify how cold a given period was, reflecting the energy demand for heating buildings. HDD is calculated as the sum of the differences between a reference temperature of 15&deg;C and the daily mean temperature, for all days when the mean temperature falls below 15&deg;C.</li> </ul> <div id="subgroup-hdd" class="flex flex-col gap-2"> <div class="flex items-start gap-2" style="text-align: justify;">Those indicators are based on Copernicus ERA5-Land. ERA5-Land is used as it provides harmonised, globally consistent coverage at fine spatial resolution (0.1 degree), enabling the production of comparable subnational indicators also where national meteorological data are not available at the required scale.</div> <div class="flex items-start gap-2" style="text-align: justify;"><br />These estimates may differ from official subnational climate statistics due to differences in methodological approaches, such as the use of reanalysis based top down modelling versus in situ observations, along with variations in input data sources, spatial resolution, and the models and algorithms used to generate temperature estimates.</div> </div> <p><strong>Definition of regions</strong></p> <p style="text-align: justify;">Regions are subnational units below national boundaries. OECD countries have two regional levels: large regions (territorial level 2 or TL2) and small regions (territorial level 3 or TL3). For more information, see the OECD Territorial grid <a href="https://webfs-cfe.oecd.org/files/.Stat/region/OECD_territorial-grid_TL2024.pdf">(pdf)</a> and the OECD Territorial Correspondence Table <a href="https://webfs-cfe.oecd.org/files/.Stat/region/OECD%20Territorial%20correspondence%20-%20TL2024c.xlsx">(xlsx)</a>.&nbsp;</p> <p><strong>Cite this dataset</strong></p> <p>OECD Regions, Cities and Local Areas database&nbsp;<a href="http://oe.cd/geostats">http://oe.cd/geostats</a>.</p> <p><strong>Further information</strong></p> <ul> <li><a href="https://localdataportal.oecd.org/">OECD Local Data Portal</a>&nbsp;</li> <li><a href="https://www.oecd.org/en/publications/oecd-regions-and-cities-at-a-glance-2024_f42db3bf-en.html">OECD Regions and Cities at a Glance</a></li> </ul> <p>For questions and/or comments, please email <a href="mailto:RegionStat@oecd.org">RegionStat@oecd.org</a>.</p>