Cooling and heating degree days - Regions by country
<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...
What the numbers show
Cooling and heating degree days - Regions is currently reported for 48 countries. The highest value is 6,571 Degree days in Russia; the lowest is 9 Degree days in Costa Rica.
The median across all reporting countries is 1,790 Degree days, and the mean is 1,979 Degree days.
The gap between the highest and lowest reporting country is a factor of about 730.
Over the past decade 4 countries rose and 44 fell. The largest increase was in Australia (up 4.2%), and the largest decrease in Brazil (down 42.7%).
Cooling and heating degree days - Regions: full country ranking
| # | Country | Latest | Year | 10-year change | Trend |
|---|---|---|---|---|---|
| 1 | Russia | 6,571 Degree days | 2023 | down 3.0% | falling |
| 2 | Canada | 6,256 Degree days | 2023 | down 11.2% | falling |
| 3 | Iceland | 5,298 Degree days | 2023 | down 1.5% | falling |
| 4 | Norway | 5,008 Degree days | 2023 | up 1.2% | falling |
| 5 | Finland | 4,433 Degree days | 2023 | up 3.1% | falling |
| 6 | Sweden | 4,264 Degree days | 2023 | up 1.1% | falling |
| 7 | Switzerland | 3,352 Degree days | 2023 | down 15.3% | falling |
| 8 | Estonia | 3,166 Degree days | 2023 | down 5.4% | falling |
| 9 | Latvia | 2,935 Degree days | 2023 | down 10.0% | falling |
| 10 | Austria | 2,917 Degree days | 2023 | down 14.1% | falling |
| 11 | United States | 2,834 Degree days | 2023 | down 9.9% | falling |
| 12 | Lithuania | 2,690 Degree days | 2023 | down 13.4% | falling |
| 13 | Chile | 2,467 Degree days | 2023 | down 2.5% | falling |
| 14 | Czechia | 2,334 Degree days | 2023 | down 18.5% | falling |
| 15 | Poland | 2,277 Degree days | 2023 | down 18.3% | falling |
| 16 | Denmark | 2,170 Degree days | 2023 | down 14.4% | falling |
| 17 | Slovenia | 2,087 Degree days | 2023 | down 15.3% | falling |
| 18 | Romania | 2,078 Degree days | 2023 | down 11.5% | falling |
| 19 | Germany | 2,030 Degree days | 2023 | down 21.7% | falling |
| 20 | United Kingdom | 2,020 Degree days | 2023 | down 18.4% | falling |
| 21 | Japan | 2,018 Degree days | 2023 | down 13.9% | falling |
| 22 | Luxembourg | 2,002 Degree days | 2023 | down 24.5% | falling |
| 23 | New Zealand | 1,851 Degree days | 2023 | down 1.4% | falling |
| 24 | Serbia | 1,823 Degree days | 2023 | down 10.2% | falling |
| 25 | Hungary | 1,758 Degree days | 2023 | down 14.3% | falling |
| 26 | Belgium | 1,735 Degree days | 2023 | down 25.8% | falling |
| 27 | Bulgaria | 1,728 Degree days | 2023 | down 10.7% | falling |
| 28 | Ireland | 1,664 Degree days | 2023 | down 20.6% | falling |
| 29 | Netherlands | 1,657 Degree days | 2023 | down 25.1% | falling |
| 30 | Croatia | 1,618 Degree days | 2023 | down 16.6% | falling |
| 31 | Italy | 1,563 Degree days | 2023 | down 15.2% | falling |
| 32 | France | 1,362 Degree days | 2023 | down 24.1% | falling |
| 33 | Argentina | 1,267 Degree days | 2023 | down 6.9% | falling |
| 34 | Spain | 1,172 Degree days | 2023 | down 25.8% | falling |
| 35 | Greece | 1,115 Degree days | 2023 | down 8.2% | falling |
| 36 | Portugal | 756.55 Degree days | 2023 | down 27.5% | falling |
| 37 | Peru | 729.79 Degree days | 2023 | down 8.7% | falling |
| 38 | South Africa | 459.81 Degree days | 2023 | down 0.9% | falling |
| 39 | Tunisia | 421.89 Degree days | 2023 | down 17.0% | falling |
| 40 | India | 236.47 Degree days | 2023 | down 7.0% | falling |
| 41 | Mexico | 220.59 Degree days | 2023 | down 21.5% | falling |
| 42 | Israel | 215.74 Degree days | 2023 | down 28.5% | falling |
| 43 | Australia | 206.06 Degree days | 2023 | up 4.2% | falling |
| 44 | Malta | 102.65 Degree days | 2023 | down 29.9% | falling |
| 45 | Colombia | 65.41 Degree days | 2023 | down 4.9% | falling |
| 46 | Brazil | 12.17 Degree days | 2023 | down 42.7% | falling |
| 47 | Indonesia | 11.2 Degree days | 2023 | down 5.6% | falling |
| 48 | Costa Rica | 9 Degree days | 2023 | down 21.7% | falling |
Regions and income groups
Aggregates are excluded from the country ranking above so that a region can never outrank a country.
- China (People's Republic of) 3,576 Degree days
- Slovak Republic 2,459 Degree days
- Korea 1,949 Degree days
About this data
<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°C, for all days when the mean temperature exceeds 22°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°C and the daily mean temperature, for all days when the mean temperature falls below 15°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>. </p> <p><strong>Cite this dataset</strong></p> <p>OECD Regions, Cities and Local Areas database <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> </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>