Cooling and heating degree days - Cities and FUAs — Change in cooling in Wellington
Wellington: Cooling and heating degree days - Cities and FUAs — Change in cooling was -0.4928 Degree days in 2025. ◆ Volatile
Cooling and heating degree days - Cities and FUAs — Change in cooling in Wellington, 1950–2025
Source: Organisation for Economic Co-operation and Development. Measured in Degree days.
Analysis
The most recent figure for cooling and heating degree days - cities and fuas — change in cooling in Wellington is -0.4928 Degree days, measured in 2025. That is the lowest value across all 76 years on record.
Compared with earlier readings it is down 517.2% on the previous year and down 153.0% over ten years.
Over the whole period, cooling and heating degree days - cities and fuas — change in cooling in Wellington peaked at 3.13 Degree days in 2018 and was at its lowest, -0.4928 Degree days, in 1969.
Wellington ranks 481st of 1314 regions on this measure, in the middle of the range.
The series is highly variable year to year, so single readings are best treated with caution.
Cooling and heating degree days - Cities and FUAs — Change in cooling in Wellington, year by year
| Year | Degree days | Change |
|---|---|---|
| 1950 | -0.4879 Degree days | — |
| 1951 | -0.4401 Degree days | -9.8% |
| 1952 | 0.2539 Degree days | -157.7% |
| 1953 | -0.4087 Degree days | -261.0% |
| 1954 | 0.7154 Degree days | -275.0% |
| 1955 | -0.1079 Degree days | -115.1% |
| 1956 | 0.5753 Degree days | -633.1% |
| 1957 | 0.2713 Degree days | -52.9% |
| 1958 | 0.0195 Degree days | -92.8% |
| 1959 | 0.686 Degree days | +3414.4% |
| 1960 | 0.1046 Degree days | -84.7% |
| 1961 | -0.3442 Degree days | -429.0% |
| 1962 | 0.121 Degree days | -135.2% |
| 1963 | -0.4483 Degree days | -470.4% |
| 1964 | -0.1322 Degree days | -70.5% |
| 1965 | -0.3994 Degree days | +202.1% |
| 1966 | -0.3264 Degree days | -18.3% |
| 1967 | -0.4608 Degree days | +41.2% |
| 1968 | 0.6647 Degree days | -244.3% |
| 1969 | -0.4928 Degree days | -174.1% |
| 1970 | -0.2631 Degree days | -46.6% |
| 1971 | 0.6159 Degree days | -334.1% |
| 1972 | -0.4911 Degree days | -179.7% |
| 1973 | -0.0822 Degree days | -83.3% |
| 1974 | 0.1077 Degree days | -231.1% |
| 1975 | 2.94 Degree days | +2627.4% |
| 1976 | -0.4928 Degree days | -116.8% |
| 1977 | -0.3896 Degree days | -20.9% |
| 1978 | 0.1337 Degree days | -134.3% |
| 1979 | -0.4122 Degree days | -408.3% |
| 1980 | -0.4928 Degree days | +19.5% |
| 1981 | 1.14 Degree days | -332.2% |
| 1982 | -0.0983 Degree days | -108.6% |
| 1983 | -0.4928 Degree days | +401.3% |
| 1984 | -0.4796 Degree days | -2.7% |
| 1985 | 0.5183 Degree days | -208.1% |
| 1986 | -0.4495 Degree days | -186.7% |
| 1987 | -0.3373 Degree days | -25.0% |
| 1988 | 0.8297 Degree days | -346.0% |
| 1989 | 1.18 Degree days | +41.7% |
| 1990 | -0.2874 Degree days | -124.4% |
| 1991 | -0.4378 Degree days | +52.3% |
| 1992 | -0.4656 Degree days | +6.3% |
| 1993 | -0.4928 Degree days | +5.8% |
| 1994 | 0.1088 Degree days | -122.1% |
| 1995 | 0.4434 Degree days | +307.5% |
| 1996 | -0.4928 Degree days | -211.1% |
| 1997 | -0.4928 Degree days | -0.0% |
| 1998 | -0.2861 Degree days | -41.9% |
| 1999 | 0.2007 Degree days | -170.2% |
| 2000 | -0.4889 Degree days | -343.5% |
| 2001 | -0.4032 Degree days | -17.5% |
| 2002 | -0.4901 Degree days | +21.5% |
| 2003 | -0.2339 Degree days | -52.3% |
| 2004 | -0.1992 Degree days | -14.8% |
| 2005 | 0.9033 Degree days | -553.4% |
| 2006 | -0.1702 Degree days | -118.8% |
| 2007 | 0.0361 Degree days | -121.2% |
| 2008 | 2.15 Degree days | +5842.0% |
| 2009 | -0.2361 Degree days | -111.0% |
| 2010 | -0.4709 Degree days | +99.4% |
| 2011 | -0.3104 Degree days | -34.1% |
| 2012 | 0.1155 Degree days | -137.2% |
| 2013 | 1.19 Degree days | +929.0% |
| 2014 | -0.3188 Degree days | -126.8% |
| 2015 | 0.9304 Degree days | -391.8% |
| 2016 | 0.7864 Degree days | -15.5% |
| 2017 | -0.1393 Degree days | -117.7% |
| 2018 | 3.13 Degree days | -2349.7% |
| 2019 | 1.55 Degree days | -50.7% |
| 2020 | -0.3445 Degree days | -122.3% |
| 2021 | -0.4045 Degree days | +17.4% |
| 2022 | 0.831 Degree days | -305.4% |
| 2023 | -0.1224 Degree days | -114.7% |
| 2024 | 0.1181 Degree days | -196.5% |
| 2025 | -0.4928 Degree days | -517.2% |
Averages by decade
| Decade | Average | Lowest | Highest | Years |
|---|---|---|---|---|
| 1950s | 0.1077 Degree days | -0.4879 Degree days | 0.7154 Degree days | 10 |
| 1960s | -0.1714 Degree days | -0.4928 Degree days | 0.6647 Degree days | 10 |
| 1970s | 0.1665 Degree days | -0.4928 Degree days | 2.94 Degree days | 10 |
| 1980s | 0.1317 Degree days | -0.4928 Degree days | 1.18 Degree days | 10 |
| 1990s | -0.2202 Degree days | -0.4928 Degree days | 0.4434 Degree days | 10 |
| 2000s | 0.0863 Degree days | -0.4901 Degree days | 2.15 Degree days | 10 |
| 2010s | 0.646 Degree days | -0.4709 Degree days | 3.13 Degree days | 10 |
| 2020s | -0.0692 Degree days | -0.4928 Degree days | 0.831 Degree days | 6 |
More reference data data for Wellington
- Cooling and heating degree days - Cities and FUAs — Cooling degree 0 Degree days (2025)
- Cooling and heating degree days - Cities and FUAs 1,238 Degree days (2025)
- Cooling and heating degree days - Cities and FUAs — Change in heating 0.4961 Degree days (2025)
- Precipitation - Cities and FUAs — Extreme precipitation days 6 Days per year (2024)
- Precipitation - Cities and FUAs — Change in extreme precipitation -1.07 Days per year (2024)
- Dependency ratio - Cities and FUAs 19.1 Percentage of population aged 15-64 years (2024)
- Wind threats - Cities and FUAs — Exposure to wind threats 92.01 Percentage of area (2023)
- Coastal flooding - Cities and FUAs — Built-up area exposure to 0.0037 Percentage of built-up area (2022)
- Internet speed - Cities and FUAs — Downloading speed 14.1 Percentage of national value (2025)
- Internet speed - Cities and FUAs — Uploading speed 18.6 Percentage of national value (2025)
Frequently asked questions
- What is cooling and heating degree days - cities and fuas — change in cooling in Wellington?
- Cooling and heating degree days - cities and fuas — change in cooling in Wellington was -0.4928 Degree days in 2025, according to Organisation for Economic Co-operation and Development.
- What is the highest cooling and heating degree days - cities and fuas — change in cooling recorded in Wellington?
- The highest recorded value was 3.13 Degree days in 2018.
- What is the lowest cooling and heating degree days - cities and fuas — change in cooling recorded in Wellington?
- The lowest recorded value was -0.4928 Degree days in 1969.
- How does Wellington rank for cooling and heating degree days - cities and fuas — change in cooling?
- Wellington ranks 481st out of 1314 regions with data for 2025.
- Is cooling and heating degree days - cities and fuas — change in cooling rising or falling in Wellington?
- Over the last ten years it is down 153.0%. The long-run trend across the full record is volatile.
- Where does this Wellington data come from?
- The figures come from Organisation for Economic Co-operation and Development, published as part of Cooling and heating degree days - Cities and FUAs — Change in cooling degree days from 1981–2010 period to 2020–24 period. Statizoid updates them automatically from the source API.
Download this data
CSV · JSON — 76 observations, free to reuse under OECD Terms and Conditions (attribution required).
About this data
This dataset provides indicators of Cooling and Heating Degree Days (CDDs and HDDs) for FUAs and cities. CDDs and HDDs are measurements used to estimate energy usage based on outdoor temperature. CDD measures the demand for cooling, while HDD measures the demand for heating, both calculated relative to a baseline temperature. Data sources and methodology The indicators use 0.1-degree resolution grids from the ERA5-Land dataset. 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. Annual CDDs are the sum over a year of the differences between the daily mean outdoor air temperature and the threshold temperature when the outdoor temperature is above the threshold temperature. HDDs are the sum over a year of the differences between the threshold temperature and the daily mean outdoor air temperature when the outdoor temperature is below the threshold temperature. Threshold temperatures are set to 22°C for CDDs and 15°C for HDDs. 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. Defining FUAs and cities The OECD, in cooperation with the EU, has developed a harmonised definition of functional urban areas (FUAs) to capture the economic and functional reach of cities based on daily commuting patterns (OECD, 2012). FUAs consist of: A city – defined by urban centres in the degree of urbanisation, adapted to the closest local administrative units to define a city. A commuting zone – including all local areas where at least 15% of employed residents work in the city. The delineation process includes: Assigning municipalities surrounded by a single FUA to that FUA. Excluding non-contiguous municipalities. The correspondence table between SAUs and FUAs/cities is available in parquet and csv format. The definition identifies 1 272 FUAs and 1 269 cities in all OECD member countries except Costa Rica and three accession countries. Cite this dataset OECD Regions, cities and local areas database (Cooling and heating degree days - Cities and FUAs), http://oe.cd/geostats Further information OECD Local Data Portal OECD Regions and Cities at a Glance For questions and/or comments, please email CitiesStat@oecd.org