Air temperature, hot days, tropical nights and icing days - Cities in Seattle
Seattle: Air temperature, hot days, tropical nights and icing days - Cities was 4.9 Degrees celsius in 2025. ◆ Volatile
Air temperature, hot days, tropical nights and icing days - Cities in Seattle, 1981–2025
Source: Organisation for Economic Co-operation and Development. Measured in Degrees celsius.
Analysis
Seattle recorded 4.9 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 623.6% on the previous year and up 167.2% over ten years.
Over the whole period, air temperature, hot days, tropical nights and icing days - cities in Seattle peaked at 4.9 Degrees celsius in 2025 and was at its lowest, -1.18 Degrees celsius, in 1985.
That places Seattle 100th out of 1314 regions with data for 2025, putting it 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 Seattle, year by year
| Year | Degrees celsius | Change |
|---|---|---|
| 1981 | 0.0628 Degrees celsius | — |
| 1982 | -0.8422 Degrees celsius | -1441.5% |
| 1983 | -0.2458 Degrees celsius | -70.8% |
| 1984 | -0.8645 Degrees celsius | +251.8% |
| 1985 | -1.18 Degrees celsius | +36.1% |
| 1986 | 0.3777 Degrees celsius | -132.1% |
| 1987 | 0.9065 Degrees celsius | +140.0% |
| 1988 | 0.1988 Degrees celsius | -78.1% |
| 1989 | -0.2917 Degrees celsius | -246.7% |
| 1990 | 0.0193 Degrees celsius | -106.6% |
| 1991 | 0.2169 Degrees celsius | +1025.8% |
| 1992 | 1.21 Degrees celsius | +457.2% |
| 1993 | -0.3733 Degrees celsius | -130.9% |
| 1994 | 0.3598 Degrees celsius | -196.4% |
| 1995 | 0.3756 Degrees celsius | +4.4% |
| 1996 | -0.4767 Degrees celsius | -226.9% |
| 1997 | 0.1241 Degrees celsius | -126.0% |
| 1998 | 0.5625 Degrees celsius | +353.3% |
| 1999 | -0.4919 Degrees celsius | -187.4% |
| 2000 | -0.5539 Degrees celsius | +12.6% |
| 2001 | -0.3704 Degrees celsius | -33.1% |
| 2002 | -0.1744 Degrees celsius | -52.9% |
| 2003 | 0.6016 Degrees celsius | -445.0% |
| 2004 | 0.9671 Degrees celsius | +60.8% |
| 2005 | 0.4875 Degrees celsius | -49.6% |
| 2006 | 0.3034 Degrees celsius | -37.8% |
| 2007 | -0.2037 Degrees celsius | -167.1% |
| 2008 | -0.6855 Degrees celsius | +236.5% |
| 2009 | -0.11 Degrees celsius | -83.9% |
| 2010 | 0.0884 Degrees celsius | -180.4% |
| 2011 | -0.9848 Degrees celsius | -1213.4% |
| 2012 | -0.0761 Degrees celsius | -92.3% |
| 2013 | 0.1762 Degrees celsius | -331.7% |
| 2014 | 0.8984 Degrees celsius | +409.8% |
| 2015 | 1.84 Degrees celsius | +104.3% |
| 2016 | 0.8621 Degrees celsius | -53.0% |
| 2017 | 0.2413 Degrees celsius | -72.0% |
| 2018 | 0.8722 Degrees celsius | +261.5% |
| 2019 | 0.2076 Degrees celsius | -76.2% |
| 2020 | 0.6809 Degrees celsius | +228.1% |
| 2021 | 0.6156 Degrees celsius | -9.6% |
| 2022 | 0.4374 Degrees celsius | -28.9% |
| 2023 | 0.8756 Degrees celsius | +100.2% |
| 2024 | 0.6778 Degrees celsius | -22.6% |
| 2025 | 4.9 Degrees celsius | +623.6% |
Averages by decade
| Decade | Average | Lowest | Highest | Years |
|---|---|---|---|---|
| 1980s | -0.2084 Degrees celsius | -1.18 Degrees celsius | 0.9065 Degrees celsius | 9 |
| 1990s | 0.1525 Degrees celsius | -0.4919 Degrees celsius | 1.21 Degrees celsius | 10 |
| 2000s | 0.0262 Degrees celsius | -0.6855 Degrees celsius | 0.9671 Degrees celsius | 10 |
| 2010s | 0.4121 Degrees celsius | -0.9848 Degrees celsius | 1.84 Degrees celsius | 10 |
| 2020s | 1.37 Degrees celsius | 0.4374 Degrees celsius | 4.9 Degrees celsius | 6 |
More climate change data for Seattle
- Air temperature, hot days, tropical nights and icing days - Cities 11.87 Degrees celsius (2025)
- Climate projections by scenario, 2030–2060 – Cities and FUAs 10.94 Degrees celsius (2060)
- Climate projections by scenario, 2030–2060 – Cities and FUAs 1.74 Degrees celsius (2060)
- Greenhouse gas emissions - Cities and FUAs — GHG emissions from 0.09 Tonnes of CO2-equivalent (2024)
- Greenhouse gas emissions - Cities and FUAs — GHG emissions from 6.6 Tonnes of CO2-equivalent (2024)
- Greenhouse gas emissions - Cities and FUAs — GHG emissions from 5.98 Tonnes of CO2-equivalent (2024)
- Greenhouse gas emissions - Cities and FUAs — GHG emissions from 5.82 Tonnes of CO2-equivalent (2024)
- Greenhouse gas emissions - Cities and FUAs — GHG emissions from power 1.26 Tonnes of CO2-equivalent (2024)
- Greenhouse gas emissions - Cities and FUAs — GHG emissions from road 6.18 Tonnes of CO2-equivalent (2024)
- Greenhouse gas emissions - Cities and FUAs — GHG emissions total 22.07 Tonnes of CO2-equivalent (2024)
Frequently asked questions
- What is air temperature, hot days, tropical nights and icing days - cities in Seattle?
- Air temperature, hot days, tropical nights and icing days - cities in Seattle was 4.9 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 Seattle?
- The highest recorded value was 4.9 Degrees celsius in 2025.
- What is the lowest air temperature, hot days, tropical nights and icing days - cities recorded in Seattle?
- The lowest recorded value was -1.18 Degrees celsius in 1985.
- How does Seattle rank for air temperature, hot days, tropical nights and icing days - cities?
- Seattle ranks 100th out of 1314 regions with data for 2025.
- Is air temperature, hot days, tropical nights and icing days - cities rising or falling in Seattle?
- Over the last ten years it is up 167.2%. The long-run trend across the full record is volatile.
- Where does this Seattle 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