World Meteorological Organization - WMO

The Earth’s energy imbalance has reached a new high in 2025. Under a stable climate, incoming energy from the sun is about the same as the amount of outgoing energy. However, increasing concentrations of greenhouse gases such as carbon dioxide, methane and nitrous oxide trap outgoing energy. As the trapped energy accumulates, it raises temperatures on land and in the oceans. More findings from the WMO Global #StateOfClimate 2025. 🔗bit.ly/StateOfClimate2025

The last 11 years have been the hottest years ever recorded. Earth’s energy imbalance has reached its highest than at any time in observed history, with heat reaching deeper into the ocean. This is the Global #StateOfClimate 2025. Read the full report. Act. 🔗bit.ly/StateOfClimate2025 #WorldMetDay

Why do we need observations? Forecasts rely on data observed from all over the planet. Every economic decision, every infrastructure investment, every crop planting schedule, every health, water and energy management plan, and every supply-chain adjustment all depend on WMO’s global observing and forecasting backbone. The risks of extreme weather to communities and economies increase as rising temperatures fuel more intense heatwaves, extreme rainfall and rapidly intensifying tropical cyclones. Earth observations provide the data we need to understand these risks and make better decisions to protect lives, communities and economies. Only by observing today, can we protect tomorrow. Find out more this #WorldMetDay on 23 March. Be part of the unveiling of the WMO #StateOfClimate 2025 report.

Did you ever wonder what the weather was like on the day you were born? This new app can be your time machine to revisit past weather. Weather Replay from @copernicusecmwf enabling anyone to revisit the weather anywhere on the globe, hour by hour, from January 1940 up to a few days before present. The simulations uses ERA5 reanalysis, a cloud-ready ARCO archive system produced with roughly the same tools used for the ECMWF weather forecast. The app allows users to select a date and location and features a selection of significant historical weather events like storms, heatwaves, and flooding. Weather Replay can also compare two events. For example, the heatwave in Scandinavia in July 2018 with the unprecedented heatwave in Fennoscandia of 2025 which was featured as a highlight in the European State of the Climate #ESOTC2025 report. Explore this app through the link in our bio.

The sun will not set in Utqiaġvik, Alaska, for the next 79 days 😮 The annual “midnight sun” season began on 10 May, when the sun rose above the horizon at 2:57 a.m. @nws captured the last sunset and sunrise in the northernmost city in the USA until 2 August.

[EN] The #StateOfClimate in Latin America and the Caribbean 2025 report launches on Monday, 18 May! Live from the auditorium of the Ministry of Agriculture of Brazil and in collaboration with INMET and CEMADEN, the event will bring together scientists, policymakers and partners from across the region to present the latest findings on climate indicators, extreme events and impacts in Latin America and the Caribbean. Interpretation will be available in English, Spanish and Portuguese. Register using the link in our bio to watch the event online. — [POR] O relatório #EstadoDoClima na América Latina e no Caribe 2025 será lançado na segunda-feira, 18 de maio. Ao vivo desde o auditório do Ministério da Agricultura do Brasil e em colaboração com o INMET e o CEMADEN, o evento reunirá cientistas, tomadores de decisão e parceiros de toda a região para apresentar as mais recentes descobertas sobre indicadores climáticos, eventos extremos e seus impactos na América Latina e no Caribe. Interpretação disponível em inglês, espanhol e português. Inscreva-se usando o link na nossa bio para acompanhar o evento online. — [ESP] El informe #EstadoDelClima en América Latina y el Caribe 2025 se lanzará el lunes 18 de mayo. En vivo desde el auditorio del Ministerio de Agricultura de Brasil y en colaboración con INMET y CEMADEN, el evento reunirá a científicos, tomadores de decisión y socios de toda la región para presentar los últimos hallazgos sobre indicadores climáticos, eventos extremos e impactos en América Latina y el Caribe. Interpretación disponible en inglés, español y portugués. Registro usando el enlace en nuestra bio para seguir el evento en línea.

Record heatwaves from the Mediterranean to the Arctic. Shrinking glaciers and declining snow cover. Renewables supplying nearly half of the region's electricity in 2025. This is the state of Europe’s climate in 2025 at a glance. #ESOTC2025 is produced by @copernicusecmwf and WMO. Link in bio.

Recent volcanic eruptions have made headlines in different parts of the world — from the deadly Mount Dukono eruption in Indonesia and Mayon Volcano blanketing Philippine towns in ash to lava streams and fountains at Kīlauea in Hawaii and and intermittent eruptive activity at Piton de la Fournaise in Réunion Island. Did you know that volcanic eruptions can trigger multiple hazards beyond lava flows? Ashfall, mudflows, poor air quality, and even climate impacts can affect communities far from the eruption site. That’s why #EarlyWarnings matter. Volcanic ash models rely on weather data such as wind field, humidity, pressure. Integrating geohazards into weather and climate services can help communities better prepare for and respond to volcanic risks. 📸 This photo of Pacaya Volcano in Guatemala captured by Cindy Lorenzo is one of the winners of the WMO 2026 calendar competition.

Climate change is one of the biggest threats to global health — but there’s a major, underused opportunity to get ahead of it. Investing in “climate services for health” to anticipate heatwaves, disease outbreaks and hospital disruptions can deliver $4 to $68 in economic benefits for every $1 invested in developing countries, according to new research from @worldresources research commissioned by @RockefellerFdn . These climate and health data-driven tools and activities — which include early warning systems, disease surveillance, public awareness campaigns and resilient health facilities — help governments and communities plan and act earlier to protect lives and strengthen health systems. “We already have the science, data and tools to anticipate and reduce these risks.” said Celeste Saulo, Secretary-General of the World Meteorological Organization. “Investing in climate services for health should not be seen as a burden: it is a life-saving, cost-effective choice that helps countries act earlier, protect people, and prevent crises before they escalate.” Click on the link in our bio to read the full study.

"The truth is: the natural world is changing. And we are totally dependent on that world. It provides our food, water and air. It is the most precious thing we have, and we need to defend it." Happy 100th birthday to Sir David Attenborough, whose stories transformed how we view and understand our Earth.

We will never see this glacier again. @ideamcolombia confirmed the extinction of the Cerros de la Plaza glacier in the Colombian Andes. In the mid-19th century, the glacier covered an area of approximately 5.5 km². In 2016, its area had shrunk to just 0.15 km² before ultimately disappearing this year. The glacier’s retreat accelerated in recent decades because of rising temperatures, a decrease in snowfall and its location at a relatively low altitude in the tropical Andes. Glacier monitoring allows for a more precise understanding of the speed and impacts of our changing climate in Colombia and elsewhere. Glaciers play key roles in water regulation and in high-mountain ecosystems. Their loss has implications that go far beyond the landscape. 📷 European Union, Copernicus Sentinel-2 imagery

In this edition of Ask a Scientist, Rebecca Emerton, Senior Scientist at the European Centre for Medium-Range Weather Forecasts (ECMWF) and Lead Editor of the European State of the Climate 2025, shares her perspective on the report. In this interview, she reflects on the finding that surprised her most, the result that deserves closer attention, and how the report can help everyone make sense of Europe's changing climate. Published jointly by the Copernicus Climate Change Service (C3S), implemented by ECMWF, and the World Meteorological Organization (WMO), #ESOTC2025 offers a clear overview of how Europe’s climate is changing and why that matters for everyday decisions, policy making and long-term climate resilience. 🌍 Explore the report at the link in bio.