Air temperature, hot days, tropical nights and icing days - Cities in Summit
Summit: Air temperature, hot days, tropical nights and icing days - Cities was 0.7473 Degrees celsius in 2025. ◆ Volatile
Air temperature, hot days, tropical nights and icing days - Cities in Summit, 1981–2025
Source: Organisation for Economic Co-operation and Development. Measured in Degrees celsius.
Analysis
Summit recorded 0.7473 Degrees celsius for air temperature, hot days, tropical nights and icing days - cities in 2025.
That represents a change of down 63.7% on the previous year and up 1,225.7% over ten years.
Over the whole period, air temperature, hot days, tropical nights and icing days - cities in Summit peaked at 2.06 Degrees celsius in 2024 and was at its lowest, -1.32 Degrees celsius, in 2014.
That places Summit 586th 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 Summit, year by year
| Year | Degrees celsius | Change |
|---|---|---|
| 1981 | -0.9085 Degrees celsius | — |
| 1982 | -0.4099 Degrees celsius | -54.9% |
| 1983 | 0.1343 Degrees celsius | -132.8% |
| 1984 | -0.4169 Degrees celsius | -410.5% |
| 1985 | -0.2664 Degrees celsius | -36.1% |
| 1986 | 0.1545 Degrees celsius | -158.0% |
| 1987 | 0.4056 Degrees celsius | +162.5% |
| 1988 | -0.2394 Degrees celsius | -159.0% |
| 1989 | -0.9648 Degrees celsius | +303.0% |
| 1990 | 0.9295 Degrees celsius | -196.3% |
| 1991 | 1.44 Degrees celsius | +55.1% |
| 1992 | -0.4807 Degrees celsius | -133.3% |
| 1993 | -0.2841 Degrees celsius | -40.9% |
| 1994 | -0.3377 Degrees celsius | +18.9% |
| 1995 | -0.4556 Degrees celsius | +34.9% |
| 1996 | -0.9176 Degrees celsius | +101.4% |
| 1997 | -0.6894 Degrees celsius | -24.9% |
| 1998 | 1.75 Degrees celsius | -353.6% |
| 1999 | 0.6928 Degrees celsius | -60.4% |
| 2000 | -0.3103 Degrees celsius | -144.8% |
| 2001 | 0.5268 Degrees celsius | -269.8% |
| 2002 | 0.7766 Degrees celsius | +47.4% |
| 2003 | -0.7484 Degrees celsius | -196.4% |
| 2004 | -0.1998 Degrees celsius | -73.3% |
| 2005 | 0.1112 Degrees celsius | -155.7% |
| 2006 | 0.7471 Degrees celsius | +571.9% |
| 2007 | 0.4723 Degrees celsius | -36.8% |
| 2008 | -0.2895 Degrees celsius | -161.3% |
| 2009 | -0.5008 Degrees celsius | +73.0% |
| 2010 | 0.2787 Degrees celsius | -155.7% |
| 2011 | 0.5186 Degrees celsius | +86.1% |
| 2012 | 1.84 Degrees celsius | +254.4% |
| 2013 | -0.2083 Degrees celsius | -111.3% |
| 2014 | -1.32 Degrees celsius | +534.3% |
| 2015 | 0.0564 Degrees celsius | -104.3% |
| 2016 | 1.21 Degrees celsius | +2050.1% |
| 2017 | 1.05 Degrees celsius | -13.1% |
| 2018 | 0.3435 Degrees celsius | -67.4% |
| 2019 | 0.5245 Degrees celsius | +52.7% |
| 2020 | 1.16 Degrees celsius | +120.3% |
| 2021 | 1.25 Degrees celsius | +8.6% |
| 2022 | 0.3553 Degrees celsius | -71.7% |
| 2023 | 1.29 Degrees celsius | +263.9% |
| 2024 | 2.06 Degrees celsius | +59.2% |
| 2025 | 0.7473 Degrees celsius | -63.7% |
Averages by decade
| Decade | Average | Lowest | Highest | Years |
|---|---|---|---|---|
| 1980s | -0.2791 Degrees celsius | -0.9648 Degrees celsius | 0.4056 Degrees celsius | 9 |
| 1990s | 0.1648 Degrees celsius | -0.9176 Degrees celsius | 1.75 Degrees celsius | 10 |
| 2000s | 0.0585 Degrees celsius | -0.7484 Degrees celsius | 0.7766 Degrees celsius | 10 |
| 2010s | 0.4295 Degrees celsius | -1.32 Degrees celsius | 1.84 Degrees celsius | 10 |
| 2020s | 1.14 Degrees celsius | 0.3553 Degrees celsius | 2.06 Degrees celsius | 6 |
More climate change data for Summit
- Air temperature, hot days, tropical nights and icing days - Cities 10.79 Degrees celsius (2025)
- Climate projections by scenario, 2030–2060 – Cities and FUAs 12.44 Degrees celsius (2060)
- Climate projections by scenario, 2030–2060 – Cities and FUAs 1.86 Degrees celsius (2060)
- Greenhouse gas emissions - Cities and FUAs — GHG emissions from 0.01 Tonnes of CO2-equivalent (2024)
- Greenhouse gas emissions - Cities and FUAs — GHG emissions from 0.96 Tonnes of CO2-equivalent (2024)
- Greenhouse gas emissions - Cities and FUAs — GHG emissions from 1.85 Tonnes of CO2-equivalent (2024)
- Greenhouse gas emissions - Cities and FUAs — GHG emissions from 1.79 Tonnes of CO2-equivalent (2024)
- Greenhouse gas emissions - Cities and FUAs — GHG emissions from power 0.05 Tonnes of CO2-equivalent (2024)
- Greenhouse gas emissions - Cities and FUAs — GHG emissions from road 1.34 Tonnes of CO2-equivalent (2024)
- Greenhouse gas emissions - Cities and FUAs — GHG emissions total 4.51 Tonnes of CO2-equivalent (2024)
Frequently asked questions
- What is air temperature, hot days, tropical nights and icing days - cities in Summit?
- Air temperature, hot days, tropical nights and icing days - cities in Summit was 0.7473 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 Summit?
- The highest recorded value was 2.06 Degrees celsius in 2024.
- What is the lowest air temperature, hot days, tropical nights and icing days - cities recorded in Summit?
- The lowest recorded value was -1.32 Degrees celsius in 2014.
- How does Summit rank for air temperature, hot days, tropical nights and icing days - cities?
- Summit ranks 586th out of 1314 regions with data for 2025.
- Is air temperature, hot days, tropical nights and icing days - cities rising or falling in Summit?
- Over the last ten years it is up 1,225.7%. The long-run trend across the full record is volatile.
- Where does this Summit 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