Air temperature, hot days, tropical nights and icing days - Cities in Napa
Napa: Air temperature, hot days, tropical nights and icing days - Cities was 7.18 Degrees celsius in 2025. ◆ Volatile
Air temperature, hot days, tropical nights and icing days - Cities in Napa, 1981–2025
Source: Organisation for Economic Co-operation and Development. Measured in Degrees celsius.
Analysis
Napa recorded 7.18 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.
Compared with earlier readings it is up 551.1% on the previous year and up 614.9% over ten years.
Over the whole period, air temperature, hot days, tropical nights and icing days - cities in Napa peaked at 7.18 Degrees celsius in 2025 and was at its lowest, -1.08 Degrees celsius, in 1998.
Napa ranks 34th 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 Napa, year by year
| Year | Degrees celsius | Change |
|---|---|---|
| 1981 | 0.4042 Degrees celsius | — |
| 1982 | -1.02 Degrees celsius | -353.0% |
| 1983 | -0.4994 Degrees celsius | -51.2% |
| 1984 | 0.3209 Degrees celsius | -164.3% |
| 1985 | -0.3771 Degrees celsius | -217.5% |
| 1986 | 0.3218 Degrees celsius | -185.3% |
| 1987 | 0.0928 Degrees celsius | -71.2% |
| 1988 | 0.3881 Degrees celsius | +318.4% |
| 1989 | -0.3853 Degrees celsius | -199.3% |
| 1990 | 0.1231 Degrees celsius | -132.0% |
| 1991 | 0.0215 Degrees celsius | -82.5% |
| 1992 | 0.6762 Degrees celsius | +3040.7% |
| 1993 | -0.0144 Degrees celsius | -102.1% |
| 1994 | -0.3 Degrees celsius | +1986.8% |
| 1995 | 0.2835 Degrees celsius | -194.5% |
| 1996 | 0.8337 Degrees celsius | +194.1% |
| 1997 | 0.7801 Degrees celsius | -6.4% |
| 1998 | -1.08 Degrees celsius | -238.5% |
| 1999 | -0.5592 Degrees celsius | -48.2% |
| 2000 | -0.2977 Degrees celsius | -46.8% |
| 2001 | 0.2126 Degrees celsius | -171.4% |
| 2002 | 0.0059 Degrees celsius | -97.2% |
| 2003 | 0.1258 Degrees celsius | +2047.5% |
| 2004 | 0.3241 Degrees celsius | +157.6% |
| 2005 | -0.0079 Degrees celsius | -102.4% |
| 2006 | -0.1253 Degrees celsius | +1493.5% |
| 2007 | 0.0249 Degrees celsius | -119.9% |
| 2008 | 0.3238 Degrees celsius | +1201.4% |
| 2009 | 0.0748 Degrees celsius | -76.9% |
| 2010 | -0.6683 Degrees celsius | -993.1% |
| 2011 | -0.7396 Degrees celsius | +10.7% |
| 2012 | 0.0014 Degrees celsius | -100.2% |
| 2013 | 0.3979 Degrees celsius | +28066.4% |
| 2014 | 1.34 Degrees celsius | +236.1% |
| 2015 | 1 Degrees celsius | -24.9% |
| 2016 | 0.4594 Degrees celsius | -54.3% |
| 2017 | 1.01 Degrees celsius | +120.0% |
| 2018 | 0.9763 Degrees celsius | -3.4% |
| 2019 | 0.6269 Degrees celsius | -35.8% |
| 2020 | 1.71 Degrees celsius | +172.0% |
| 2021 | 0.9767 Degrees celsius | -42.7% |
| 2022 | 0.9645 Degrees celsius | -1.2% |
| 2023 | -0.1462 Degrees celsius | -115.2% |
| 2024 | 1.1 Degrees celsius | -854.3% |
| 2025 | 7.18 Degrees celsius | +551.1% |
Averages by decade
| Decade | Average | Lowest | Highest | Years |
|---|---|---|---|---|
| 1980s | -0.0841 Degrees celsius | -1.02 Degrees celsius | 0.4042 Degrees celsius | 9 |
| 1990s | 0.0764 Degrees celsius | -1.08 Degrees celsius | 0.8337 Degrees celsius | 10 |
| 2000s | 0.0661 Degrees celsius | -0.2977 Degrees celsius | 0.3241 Degrees celsius | 10 |
| 2010s | 0.4406 Degrees celsius | -0.7396 Degrees celsius | 1.34 Degrees celsius | 10 |
| 2020s | 1.96 Degrees celsius | -0.1462 Degrees celsius | 7.18 Degrees celsius | 6 |
More climate change data for Napa
- Air temperature, hot days, tropical nights and icing days - Cities 22.37 Degrees celsius (2025)
- Climate projections by scenario, 2030–2060 – Cities and FUAs 17.19 Degrees celsius (2060)
- Climate projections by scenario, 2030–2060 – Cities and FUAs 1.95 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 0.26 Tonnes of CO2-equivalent (2024)
- Greenhouse gas emissions - Cities and FUAs — GHG emissions from 0.29 Tonnes of CO2-equivalent (2024)
- Greenhouse gas emissions - Cities and FUAs — GHG emissions from 0.28 Tonnes of CO2-equivalent (2024)
- Greenhouse gas emissions - Cities and FUAs — GHG emissions from power 0.01 Tonnes of CO2-equivalent (2024)
- Greenhouse gas emissions - Cities and FUAs — GHG emissions from road 0.42 Tonnes of CO2-equivalent (2024)
- Greenhouse gas emissions - Cities and FUAs — GHG emissions total 1.05 Tonnes of CO2-equivalent (2024)
Frequently asked questions
- What is air temperature, hot days, tropical nights and icing days - cities in Napa?
- Air temperature, hot days, tropical nights and icing days - cities in Napa was 7.18 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 Napa?
- The highest recorded value was 7.18 Degrees celsius in 2025.
- What is the lowest air temperature, hot days, tropical nights and icing days - cities recorded in Napa?
- The lowest recorded value was -1.08 Degrees celsius in 1998.
- How does Napa rank for air temperature, hot days, tropical nights and icing days - cities?
- Napa ranks 34th out of 1314 regions with data for 2025.
- Is air temperature, hot days, tropical nights and icing days - cities rising or falling in Napa?
- Over the last ten years it is up 614.9%. The long-run trend across the full record is volatile.
- Where does this Napa 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