Air temperature, hot days, tropical nights and icing days - Cities in Dacorum
Dacorum: Air temperature, hot days, tropical nights and icing days - Cities was -0.4575 Degrees celsius in 2025. ◆ Volatile
Air temperature, hot days, tropical nights and icing days - Cities in Dacorum, 1981–2025
Source: Organisation for Economic Co-operation and Development. Measured in Degrees celsius.
Analysis
In 2025, air temperature, hot days, tropical nights and icing days - cities in Dacorum stood at -0.4575 Degrees celsius.
Compared with earlier readings it is down 138.0% on the previous year and down 189.6% over ten years.
Over the whole period, air temperature, hot days, tropical nights and icing days - cities in Dacorum peaked at 1.49 Degrees celsius in 2022 and was at its lowest, -1.26 Degrees celsius, in 1986.
Dacorum ranks 872nd 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.
Air temperature, hot days, tropical nights and icing days - Cities in Dacorum, year by year
| Year | Degrees celsius | Change |
|---|---|---|
| 1981 | -0.8483 Degrees celsius | — |
| 1982 | -0.0854 Degrees celsius | -89.9% |
| 1983 | 0.001 Degrees celsius | -101.2% |
| 1984 | -0.311 Degrees celsius | -31408.6% |
| 1985 | -1.11 Degrees celsius | +255.5% |
| 1986 | -1.26 Degrees celsius | +13.5% |
| 1987 | -0.8645 Degrees celsius | -31.1% |
| 1988 | -0.1652 Degrees celsius | -80.9% |
| 1989 | 0.7667 Degrees celsius | -564.0% |
| 1990 | 0.8584 Degrees celsius | +12.0% |
| 1991 | -0.4657 Degrees celsius | -154.2% |
| 1992 | -0.0749 Degrees celsius | -83.9% |
| 1993 | -0.3576 Degrees celsius | +377.2% |
| 1994 | 0.3911 Degrees celsius | -209.4% |
| 1995 | 0.4807 Degrees celsius | +22.9% |
| 1996 | -0.841 Degrees celsius | -275.0% |
| 1997 | 0.5088 Degrees celsius | -160.5% |
| 1998 | 0.2435 Degrees celsius | -52.1% |
| 1999 | 0.4997 Degrees celsius | +105.2% |
| 2000 | 0.2138 Degrees celsius | -57.2% |
| 2001 | -0.1401 Degrees celsius | -165.5% |
| 2002 | 0.6669 Degrees celsius | -576.0% |
| 2003 | 0.6432 Degrees celsius | -3.6% |
| 2004 | 0.44 Degrees celsius | -31.6% |
| 2005 | 0.4379 Degrees celsius | -0.5% |
| 2006 | 0.882 Degrees celsius | +101.4% |
| 2007 | 0.5186 Degrees celsius | -41.2% |
| 2008 | -0.0412 Degrees celsius | -107.9% |
| 2009 | 0.0236 Degrees celsius | -157.2% |
| 2010 | -1.02 Degrees celsius | -4429.0% |
| 2011 | 0.8983 Degrees celsius | -188.1% |
| 2012 | -0.3109 Degrees celsius | -134.6% |
| 2013 | -0.4763 Degrees celsius | +53.2% |
| 2014 | 1.05 Degrees celsius | -320.5% |
| 2015 | 0.5109 Degrees celsius | -51.4% |
| 2016 | 0.4284 Degrees celsius | -16.1% |
| 2017 | 0.7327 Degrees celsius | +71.0% |
| 2018 | 1.03 Degrees celsius | +40.8% |
| 2019 | 0.6523 Degrees celsius | -36.8% |
| 2020 | 1.12 Degrees celsius | +71.9% |
| 2021 | 0.3847 Degrees celsius | -65.7% |
| 2022 | 1.49 Degrees celsius | +288.1% |
| 2023 | 1.17 Degrees celsius | -21.6% |
| 2024 | 1.2 Degrees celsius | +2.8% |
| 2025 | -0.4575 Degrees celsius | -138.0% |
Averages by decade
| Decade | Average | Lowest | Highest | Years |
|---|---|---|---|---|
| 1980s | -0.4298 Degrees celsius | -1.26 Degrees celsius | 0.7667 Degrees celsius | 9 |
| 1990s | 0.1243 Degrees celsius | -0.841 Degrees celsius | 0.8584 Degrees celsius | 10 |
| 2000s | 0.3645 Degrees celsius | -0.1401 Degrees celsius | 0.882 Degrees celsius | 10 |
| 2010s | 0.3498 Degrees celsius | -1.02 Degrees celsius | 1.05 Degrees celsius | 10 |
| 2020s | 0.8194 Degrees celsius | -0.4575 Degrees celsius | 1.49 Degrees celsius | 6 |
More climate change data for Dacorum
- Air temperature, hot days, tropical nights and icing days - Cities 9.31 Degrees celsius (2025)
- Climate projections by scenario, 2030–2060 – Cities and FUAs 11.08 Degrees celsius (2060)
- Climate projections by scenario, 2030–2060 – Cities and FUAs 1.06 Degrees celsius (2060)
- Greenhouse gas emissions - Cities and FUAs — GHG emissions from 0.02 Tonnes of CO2-equivalent (2024)
- Greenhouse gas emissions - Cities and FUAs — GHG emissions from 0.2 Tonnes of CO2-equivalent (2024)
- Greenhouse gas emissions - Cities and FUAs — GHG emissions from 0.06 Tonnes of CO2-equivalent (2024)
- Greenhouse gas emissions - Cities and FUAs — GHG emissions from 0.05 Tonnes of CO2-equivalent (2024)
- Greenhouse gas emissions - Cities and FUAs — GHG emissions from power 0 Tonnes of CO2-equivalent (2024)
- Greenhouse gas emissions - Cities and FUAs — GHG emissions from road 0.2 Tonnes of CO2-equivalent (2024)
- Greenhouse gas emissions - Cities and FUAs — GHG emissions total 0.49 Tonnes of CO2-equivalent (2024)
Frequently asked questions
- What is air temperature, hot days, tropical nights and icing days - cities in Dacorum?
- Air temperature, hot days, tropical nights and icing days - cities in Dacorum was -0.4575 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 Dacorum?
- The highest recorded value was 1.49 Degrees celsius in 2022.
- What is the lowest air temperature, hot days, tropical nights and icing days - cities recorded in Dacorum?
- The lowest recorded value was -1.26 Degrees celsius in 1986.
- How does Dacorum rank for air temperature, hot days, tropical nights and icing days - cities?
- Dacorum ranks 872nd out of 1314 regions with data for 2025.
- Is air temperature, hot days, tropical nights and icing days - cities rising or falling in Dacorum?
- Over the last ten years it is down 189.6%. The long-run trend across the full record is volatile.
- Where does this Dacorum 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