Air temperature, hot days, tropical nights and icing days - Cities in Swansea
Swansea: Air temperature, hot days, tropical nights and icing days - Cities was 0.2558 Degrees celsius in 2025. ◆ Volatile
Air temperature, hot days, tropical nights and icing days - Cities in Swansea, 1981–2025
Source: Organisation for Economic Co-operation and Development. Measured in Degrees celsius.
Analysis
Swansea recorded 0.2558 Degrees celsius for air temperature, hot days, tropical nights and icing days - cities in 2025.
The figure is down 71.5% on the previous year and down 11.5% over ten years.
Over the whole period, air temperature, hot days, tropical nights and icing days - cities in Swansea peaked at 1.23 Degrees celsius in 2022 and was at its lowest, -1.3 Degrees celsius, in 1986.
That places Swansea 706th out of 1314 regions with data for 2025, putting it in the middle of the range.
The series is highly variable year to year, so single readings are best treated with caution.
Air temperature, hot days, tropical nights and icing days - Cities in Swansea, year by year
| Year | Degrees celsius | Change |
|---|---|---|
| 1981 | -0.5622 Degrees celsius | — |
| 1982 | -0.0657 Degrees celsius | -88.3% |
| 1983 | 0.0484 Degrees celsius | -173.7% |
| 1984 | -0.0473 Degrees celsius | -197.7% |
| 1985 | -1.02 Degrees celsius | +2050.0% |
| 1986 | -1.3 Degrees celsius | +27.5% |
| 1987 | -0.7995 Degrees celsius | -38.3% |
| 1988 | -0.0458 Degrees celsius | -94.3% |
| 1989 | 0.7336 Degrees celsius | -1702.6% |
| 1990 | 0.7427 Degrees celsius | +1.2% |
| 1991 | -0.3728 Degrees celsius | -150.2% |
| 1992 | -0.1316 Degrees celsius | -64.7% |
| 1993 | -0.372 Degrees celsius | +182.6% |
| 1994 | 0.1874 Degrees celsius | -150.4% |
| 1995 | 0.5901 Degrees celsius | +214.9% |
| 1996 | -0.8215 Degrees celsius | -239.2% |
| 1997 | 0.4121 Degrees celsius | -150.2% |
| 1998 | 0.3596 Degrees celsius | -12.7% |
| 1999 | 0.4709 Degrees celsius | +31.0% |
| 2000 | 0.1178 Degrees celsius | -75.0% |
| 2001 | -0.1304 Degrees celsius | -210.6% |
| 2002 | 0.4629 Degrees celsius | -455.1% |
| 2003 | 0.4824 Degrees celsius | +4.2% |
| 2004 | 0.4454 Degrees celsius | -7.7% |
| 2005 | 0.4591 Degrees celsius | +3.1% |
| 2006 | 0.6342 Degrees celsius | +38.2% |
| 2007 | 0.6889 Degrees celsius | +8.6% |
| 2008 | -0.0089 Degrees celsius | -101.3% |
| 2009 | -0.0831 Degrees celsius | +836.6% |
| 2010 | -1.08 Degrees celsius | +1200.9% |
| 2011 | 0.599 Degrees celsius | -155.4% |
| 2012 | -0.2365 Degrees celsius | -139.5% |
| 2013 | -0.2673 Degrees celsius | +13.0% |
| 2014 | 0.8775 Degrees celsius | -428.4% |
| 2015 | 0.2892 Degrees celsius | -67.0% |
| 2016 | 0.3921 Degrees celsius | +35.6% |
| 2017 | 0.6812 Degrees celsius | +73.7% |
| 2018 | 0.636 Degrees celsius | -6.6% |
| 2019 | 0.5834 Degrees celsius | -8.3% |
| 2020 | 0.8553 Degrees celsius | +46.6% |
| 2021 | 0.4733 Degrees celsius | -44.7% |
| 2022 | 1.23 Degrees celsius | +160.5% |
| 2023 | 1.2 Degrees celsius | -2.8% |
| 2024 | 0.8991 Degrees celsius | -24.9% |
| 2025 | 0.2558 Degrees celsius | -71.5% |
Averages by decade
| Decade | Average | Lowest | Highest | Years |
|---|---|---|---|---|
| 1980s | -0.3391 Degrees celsius | -1.3 Degrees celsius | 0.7336 Degrees celsius | 9 |
| 1990s | 0.1065 Degrees celsius | -0.8215 Degrees celsius | 0.7427 Degrees celsius | 10 |
| 2000s | 0.3068 Degrees celsius | -0.1304 Degrees celsius | 0.6889 Degrees celsius | 10 |
| 2010s | 0.2474 Degrees celsius | -1.08 Degrees celsius | 0.8775 Degrees celsius | 10 |
| 2020s | 0.8191 Degrees celsius | 0.2558 Degrees celsius | 1.23 Degrees celsius | 6 |
More climate change data for Swansea
- Air temperature, hot days, tropical nights and icing days - Cities 10.39 Degrees celsius (2025)
- Climate projections by scenario, 2030–2060 – Cities and FUAs 11.32 Degrees celsius (2060)
- Climate projections by scenario, 2030–2060 – Cities and FUAs 1.39 Degrees celsius (2060)
- Greenhouse gas emissions - Cities and FUAs — GHG emissions from 0.04 Tonnes of CO2-equivalent (2024)
- Greenhouse gas emissions - Cities and FUAs — GHG emissions from 0.26 Tonnes of CO2-equivalent (2024)
- Greenhouse gas emissions - Cities and FUAs — GHG emissions from 0.11 Tonnes of CO2-equivalent (2024)
- Greenhouse gas emissions - Cities and FUAs — GHG emissions from 0.1 Tonnes of CO2-equivalent (2024)
- Greenhouse gas emissions - Cities and FUAs — GHG emissions from power 0.12 Tonnes of CO2-equivalent (2024)
- Greenhouse gas emissions - Cities and FUAs — GHG emissions from road 0.36 Tonnes of CO2-equivalent (2024)
- Greenhouse gas emissions - Cities and FUAs — GHG emissions total 0.92 Tonnes of CO2-equivalent (2024)
Frequently asked questions
- What is air temperature, hot days, tropical nights and icing days - cities in Swansea?
- Air temperature, hot days, tropical nights and icing days - cities in Swansea was 0.2558 Degrees celsius in 2025, according to Organisation for Economic Co-operation and Development.
- What is the highest air temperature, hot days, tropical nights and icing days - cities recorded in Swansea?
- The highest recorded value was 1.23 Degrees celsius in 2022.
- What is the lowest air temperature, hot days, tropical nights and icing days - cities recorded in Swansea?
- The lowest recorded value was -1.3 Degrees celsius in 1986.
- How does Swansea rank for air temperature, hot days, tropical nights and icing days - cities?
- Swansea ranks 706th out of 1314 regions with data for 2025.
- Is air temperature, hot days, tropical nights and icing days - cities rising or falling in Swansea?
- Over the last ten years it is down 11.5%. The long-run trend across the full record is volatile.
- Where does this Swansea data come from?
- The figures come from Organisation for Economic Co-operation and Development, published as part of Air temperature, hot days, tropical nights and icing days - Cities and FUAs — Change in air temperature at 2 meters from 1981–2010 period. Statizoid updates them automatically from the source API.
Download this data
CSV · JSON — 45 observations, free to reuse under OECD Terms and Conditions (attribution required).
About this data
This dataset provides indicators of air temperature, hot days, tropical nights and icing days. Data sources and methodology Indicators are estimated using ERA5-Land data. Air temperature indicators correspond to the average annual air temperature at a height of 2 meters. Hot days correspond to the number of days when the maximum temperature exceeds 35°C. Tropical nights correspond to the days when the minimum temperature is above 20°C, and icing days to the number of days when the maximum temperature is below 0°C. 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. 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 (Air temperature, hot days, tropical nights and icing days - 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