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The ambitious goal of the Synthesis platform is to easily connect past & future climate change, at a local scale, in a way that meets the needs of the general public and enables key stakeholders like policymakers, builders, and farmers prepare with adaptation and resilience. 16/

Currently only ~100 cities feature these expanded derived metrics, but we are only getting started. Additional cities, additional metrics, and additional ways of working with the data will be added as resources allow. 14/

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We also provide Cooling Degree Days, a estimate of the demand for artificial cooling. The chart shown here is for Paris, France, where projected cooling demand has doubled over the last 40 years, and is expected to redouble during this century under current warming trends. 13/

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For selected cities, we also provide daily derived metrics, such as days above 35 °C / 95 °F. Example shown here for Houston, TX, with both historical data and model projections. Comparing models and observations in a consistent way helps to understand model reliability. 12/

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The image for any city or region and the data appearing within it can be exported with a click of the export button. Bulk data and commercial use can be requested separately at this google form: docs.google.com/forms/d/e/1F... 10/

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In addition to regional averages, similar charts are also available for thousands of cities. Shown here is the annual average temperature for Mumbai, India. Large cities in less developed countries are well represented. 9/

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Toggles let you switch between monthly and annual series as well as average, maximum, and minimum temperature changes. Both Fahrenheit and Celsius are also available. 8/

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The search box can help you directly find cities, regions, and stations. Loading up a region, like California shown here, gives both historical data and future projections. Current policy aligned SSP2-4.5 is the default, but there are up to five scenarios to choose from. 7/

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Or click the toggle to get direct access to historical weather station temperature data (40,000+ sites). 6/

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Past the login screen, you'll get a map of cities that provide localized history and projection data. Currently it supports a broad selection of over 8000 global cities, as well as regional averages for every country. 5/

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This platform provides a new way to access and use Berkeley Earth data and connect with the information needed for planning and decision making. It is already open to everyone, though for now it requires a free registration. synthesis.berkeleyearth.org/auth/register 4/

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Berkeley Earth @berkeleyearth.org · 26/06/2026

We are excited to announce our new climate data platform: Synthesis by Berkeley Earth synthesis.berkeleyearth.org It connects historical data (e.g. weather stations, city and regional averages) with bias-corrected climate model projections of the future. Introduction 🧵

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After 5 months of data, 2026 seems unlikely to set a new annual record...but with significant uncertainty around the timing and magnitude of the emergent El Niño cycle, that outlook could change quickly over the next few months. More from our May 2026 Temp Update, now avail: tinyurl.com/6jxwabaa

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Berkeley Earth @berkeleyearth.org · 23/06/2026

Join us this Thursday: @rarohde.bsky.social on findings from our May 2026 temp update, @hausfath.bsky.social w/ updates on the El Niño outlook, and what current conditions, including the heat building across Europe, signal for the remainder of 2026. Open to all. To register: tinyurl.com/57nwt93d

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Berkeley Earth @berkeleyearth.org · 12/06/2026

From 1850-2100: next week we launch our next chapter with Synthesis, our new platform featuring: -> City-level projections through 2100 for 8000 global cities -> TMAX, Days >35C, and CDDs -> Our full station archive ...all in a single interface. Join us next Tuesday: tinyurl.com/ebt3ad7d

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Berkeley Earth @berkeleyearth.org · 10/06/2026

After 15 years building the world's leading independent temperature record, Berkeley Earth is extending it forward: next week we launch Synthesis, delivering city-level warming projections for 8,000+ cities worldwide (and more). Join us for our launch event next week ➡️ tinyurl.com/ebt3ad7d

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Berkeley Earth @berkeleyearth.org · 11/05/2026

The March 2026 Western US heatwave shattered records, with roughly 30% of active US stations setting new monthly records. But it also may have revealed evidence of increasing temperature variability, not just a higher mean shift. Our complete analysis is now available: tinyurl.com/march2026hea...

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Berkeley Earth @berkeleyearth.org · 21/04/2026

🌍 Join us for our March 2026 Monthly Press Briefing! Dr. @rarohde.bsky.social will present our latest global temperature findings, including an in-depth look at the recent West Coast heatwave. 📅 Thursday, April 23 ⏰ 8:00 AM PDT | 5:00 PM CET Register: tinyurl.com/mar2026press...

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Berkeley Earth @berkeleyearth.org · 18/03/2026

Join Berkeley Earth’s February 2026 Monthly Press Briefing 🌍 🗓 March 19 - 8:00 AM PDT | 4:00 PM CET @rarohde.bsky.social and @hausfath.bsky.social will discuss long-term climate trends, regional anomalies, and early signals for 2026. Register: tinyurl.com/feb2026press...

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Berkeley Earth @berkeleyearth.org · 14/01/2026

Update: An initial version of this report was accidentally published with a mislabeled temperature anomaly map showing 2024 averages instead of 2025 averages. We regret the error. Below is the corrected map showing the 2025 averages.

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Berkeley Earth @berkeleyearth.org · 02/12/2025

This #GivingTuesday, we’re reflecting on a year of change and what comes next. In 2026, Berkeley Earth will launch Synthesis, our most significant update yet—built to deliver clear, local, decision-ready climate intelligence. 💙 Support our work: donate.berkeleyearth.org?mc_cid=58fa7...

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The current year is expected to conclude as the 3rd warmest in the instrumental record (94% chance), behind 2023 and 2024 and slightly above the long-term trend. Further, it is unlikely that 2025 will exceed the 1.5 °C threshold. 11/

Time series of annual-average temperature anomalies from 1850 to 2024, as well as forecast averages for 2025.

IRI/CPC long-range forecasts expect that this new La Niña will likely dissipate by early 2026, with increasing odds of a new El Niño event in mid to late 2026. iri.columbia.edu/our-expertis... 10/

NOAA IRI/CPC long-range forecasts for El Niño / La Niña.

After recent neutral conditions, NOAA has officially noted the return of La Niña conditions, marked by relative cooling in the Pacific. The current La Niña is expected to be weak and short-lived, but may increase the chance of Arctic outbursts in North America this winter. 9/

Time series of temperature variation in the NINO3.4 region of the central Pacific relative to the temperature of the ocean as a whole.

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On land, October 2025 was the third warmest October, continuing a rebound from modestly cooler conditions in June/July. In the oceans, October was the 4th warmest, and cooled significantly compared to September. 8/

Time series of monthly-average temperature anomalies on land since 1980.

Time series of monthly-average temperature anomalies in the ocean since 1980.

The continent wide monthly-average temperature for Antarctica was also record high in October 2025, continuing a long-term warming trend. On an annual basis, Antarctica has been the slowest warming of any continent. 7/

Time series of October average instrumental temperature in Antarctica.

4% of land and 4% of ocean had locally record warm monthly averages in October 2025. Widespread record warmth in the Northern Pacific continues. No areas of record cold monthly averages were observed. 6/

Spatially, October 2025 was notable for relative warmth in North America, Australia, Antarctica, the Arctic, parts of Asia and parts of Africa. Record warmth continues across parts of the North Pacific. Unusually cool conditions were present in Central Asia. 5/

Global map of October average temperature anomalies relative to the 1951-1980.

It is expected that 2025 will likely finish the year with a similar pattern to recent months, slightly cooler than 2023 and 2024, but still above all the earlier measured years. 4/

Seasonally wrapped time series of monthly-average temperature anomalies.

Though still cooler than October 2023 and 2024, the month-to-month time series of global anomalies has rebounded off of modestly cooler values during June and July, and is again above the long-term trend line. 3/

Monthly-average temperature anomalies since 1980.

October 2025 was 1.52 ± 0.08 °C (2.73 ± 0.14 °F) above the 1850-1900 average. This is the 3rd warmest October in the instrumental record (i.e. since 1850), behind only the El Niño boosted warmth in 2023 and 2024. 2/

Time series of October monthly-average temperature anomalies relative to the 1850-1900 average.

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Berkeley Earth @berkeleyearth.org · 14/11/2025

Temperature Update for October 2025 Third warmest October in the instrumental record. Similar conditions to September. A weak La Niña returns in the Pacific. 2025 is very likely to be the 3rd warmest year. 🧵🧪🌊

Global map of temperature anomalies in October 2025 relative to the 1951-1980 average.

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🌍 Berkeley Earth Monthly Press Briefing 📅 Wed, Nov 19 | 8 AM PDT / 5 PM CET Get the latest insights from our October 2025 Temperature Report and join a live Q&A with @rarohde.bsky.social, @hausfath.bsky.social, and the Berkeley Earth team. 🔗 Register: us02web.zoom.us/webinar/regi...

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Berkeley Earth @berkeleyearth.org · 16/10/2025

🌍 Berkeley Earth Monthly Press Briefing 📅 Thur 10/23 | 8 AM PDT / 5 PM CET Join @rarohde.bsky.social , @hausfath.bsky.social, and our team for insights from the September 2025 Temperature Report + a live Q&A. 🔗 Register: us02web.zoom.us/webinar/regi...

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Berkeley Earth @berkeleyearth.org · 10/09/2025

Back with Our Monthly Press Briefing! Join @rarohde.bsky.social, @hausfath.bsky.social, and the Berkeley Earth team on Wed 9/17 at 8am PDT / 5pm CET. We’ll share updates from the August 2025 Temperature Report and discuss the latest global climate signals. Register: us02web.zoom.us/webinar/regi...

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The recent exceptional warming peak in 2023/2024 is dissipating, and near-term temperatures are expected to return closer to the long-term trend. However, the rapid pace of man-made global warming is expected to continue, and more record years are inevitable. 12/

12-month moving average time series of global mean temperture anomalies from 1850-2025.

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With six months completed, 2025 is very likely to finish as either the 2nd warmest (35% chance) or 3rd warmest (64% chance) year on record. Following recent cooling, only a slight 1% chance of record warmth in 2025 remains. 11/

Time series of global annual average temperature anomalies for the period 1850-2024, relative to the 1850-1900 mean, as well as the predicted range of outcomes for 2025.

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The Pacific Ocean remains in a neutral condition. An ~50% chance exists that neutral conditions continue through the rest of the year, with a ~40% chance of La Niña returning late in the year, and only a modest chance of El Niño developing. iri.columbia.edu/our-expertis... 10/

Forecast probabilities for El Nino, La Nina, and neutral states in the Pacific for the next several months.

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The global ocean average has continued to cool since the El Niño related peak in 2023/2024. Since April, the ocean average has fallen below the long-term trend. Modest additional cooling remains likely. 9/

Monthly ocean average temperature anomalies since 1980.

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Relative to the long-term trend, June had one of the strongest temperature excursions on record in the Western Mediterranean. A slightly larger excursion occurred in June 2003, preceding severe July & August heat waves that killed ~70,000 Europeans. en.wikipedia.org/wiki/2003_Eu... 8/

Monthly average of temperature anomalies in the Western Mediterranean since 1850.

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June 2025 saw record warmth in the Western Mediterranean Sea. This pattern, associated with the June heat dome over Western Europe, may further promote strong heat waves in Europe during the rest of summer. 7/

Map of sea surface temperature anomalies in June 2025 in the Western Mediterranean.

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