Air temperature, hot days, tropical nights and icing days - Cities in San Diego
San Diego: Air temperature, hot days, tropical nights and icing days - Cities was 5.86 Degrees celsius in 2025. ◆ Volatile
Air temperature, hot days, tropical nights and icing days - Cities in San Diego, 1981–2025
Source: Organisation for Economic Co-operation and Development. Measured in Degrees celsius.
Analysis
San Diego recorded 5.86 Degrees celsius for air temperature, hot days, tropical nights and icing days - cities in 2025. That is the highest value across all 45 years on record.
The figure is up 684.5% on the previous year and up 446.6% over ten years.
Over the whole period, air temperature, hot days, tropical nights and icing days - cities in San Diego peaked at 5.86 Degrees celsius in 2025 and was at its lowest, -0.9423 Degrees celsius, in 1998.
San Diego ranks 71st of 1314 regions on this measure, in the top 10%.
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 San Diego, year by year
| Year | Degrees celsius | Change |
|---|---|---|
| 1981 | 0.7436 Degrees celsius | — |
| 1982 | -0.9416 Degrees celsius | -226.6% |
| 1983 | -0.4035 Degrees celsius | -57.2% |
| 1984 | 0.1966 Degrees celsius | -148.7% |
| 1985 | -0.4391 Degrees celsius | -323.4% |
| 1986 | 0.2329 Degrees celsius | -153.0% |
| 1987 | -0.4001 Degrees celsius | -271.8% |
| 1988 | 0.1532 Degrees celsius | -138.3% |
| 1989 | 0.2784 Degrees celsius | +81.8% |
| 1990 | -0.0485 Degrees celsius | -117.4% |
| 1991 | -0.3754 Degrees celsius | +674.8% |
| 1992 | 0.4325 Degrees celsius | -215.2% |
| 1993 | -0.1119 Degrees celsius | -125.9% |
| 1994 | -0.1898 Degrees celsius | +69.6% |
| 1995 | 0.4235 Degrees celsius | -323.1% |
| 1996 | 0.8095 Degrees celsius | +91.1% |
| 1997 | 0.4875 Degrees celsius | -39.8% |
| 1998 | -0.9423 Degrees celsius | -293.3% |
| 1999 | -0.411 Degrees celsius | -56.4% |
| 2000 | 0.1397 Degrees celsius | -134.0% |
| 2001 | -0.1576 Degrees celsius | -212.9% |
| 2002 | -0.2977 Degrees celsius | +88.9% |
| 2003 | 0.2195 Degrees celsius | -173.7% |
| 2004 | -0.1788 Degrees celsius | -181.5% |
| 2005 | 0.0205 Degrees celsius | -111.5% |
| 2006 | 0.3229 Degrees celsius | +1476.8% |
| 2007 | 0.1711 Degrees celsius | -47.0% |
| 2008 | 0.5448 Degrees celsius | +218.4% |
| 2009 | 0.2677 Degrees celsius | -50.9% |
| 2010 | -0.5464 Degrees celsius | -304.1% |
| 2011 | -0.7064 Degrees celsius | +29.3% |
| 2012 | 0.6206 Degrees celsius | -187.9% |
| 2013 | 0.1601 Degrees celsius | -74.2% |
| 2014 | 1.55 Degrees celsius | +865.3% |
| 2015 | 1.07 Degrees celsius | -30.6% |
| 2016 | 1.07 Degrees celsius | -0.4% |
| 2017 | 1.32 Degrees celsius | +23.2% |
| 2018 | 1.11 Degrees celsius | -15.2% |
| 2019 | -0.1925 Degrees celsius | -117.3% |
| 2020 | 1.25 Degrees celsius | -751.5% |
| 2021 | 0.8651 Degrees celsius | -31.0% |
| 2022 | 0.9423 Degrees celsius | +8.9% |
| 2023 | -0.3235 Degrees celsius | -134.3% |
| 2024 | 0.7468 Degrees celsius | -330.9% |
| 2025 | 5.86 Degrees celsius | +684.5% |
Averages by decade
| Decade | Average | Lowest | Highest | Years |
|---|---|---|---|---|
| 1980s | -0.0644 Degrees celsius | -0.9416 Degrees celsius | 0.7436 Degrees celsius | 9 |
| 1990s | 0.0074 Degrees celsius | -0.9423 Degrees celsius | 0.8095 Degrees celsius | 10 |
| 2000s | 0.1052 Degrees celsius | -0.2977 Degrees celsius | 0.5448 Degrees celsius | 10 |
| 2010s | 0.545 Degrees celsius | -0.7064 Degrees celsius | 1.55 Degrees celsius | 10 |
| 2020s | 1.56 Degrees celsius | -0.3235 Degrees celsius | 5.86 Degrees celsius | 6 |
More climate change data for San Diego
- Air temperature, hot days, tropical nights and icing days - Cities 22.9 Degrees celsius (2025)
- Climate projections by scenario, 2030–2060 – Cities and FUAs 19.38 Degrees celsius (2060)
- Climate projections by scenario, 2030–2060 – Cities and FUAs 2.3 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 4.54 Tonnes of CO2-equivalent (2024)
- Greenhouse gas emissions - Cities and FUAs — GHG emissions from 4.3 Tonnes of CO2-equivalent (2024)
- Greenhouse gas emissions - Cities and FUAs — GHG emissions from 4.2 Tonnes of CO2-equivalent (2024)
- Greenhouse gas emissions - Cities and FUAs — GHG emissions from power 3.55 Tonnes of CO2-equivalent (2024)
- Greenhouse gas emissions - Cities and FUAs — GHG emissions from road 5.74 Tonnes of CO2-equivalent (2024)
- Greenhouse gas emissions - Cities and FUAs — GHG emissions total 20.49 Tonnes of CO2-equivalent (2024)
Frequently asked questions
- What is air temperature, hot days, tropical nights and icing days - cities in San Diego?
- Air temperature, hot days, tropical nights and icing days - cities in San Diego was 5.86 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 San Diego?
- The highest recorded value was 5.86 Degrees celsius in 2025.
- What is the lowest air temperature, hot days, tropical nights and icing days - cities recorded in San Diego?
- The lowest recorded value was -0.9423 Degrees celsius in 1998.
- How does San Diego rank for air temperature, hot days, tropical nights and icing days - cities?
- San Diego ranks 71st out of 1314 regions with data for 2025.
- Is air temperature, hot days, tropical nights and icing days - cities rising or falling in San Diego?
- Over the last ten years it is up 446.6%. The long-run trend across the full record is volatile.
- Where does this San Diego 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