ClimateObservatory

A website on global warming based on weather station data | ClimateObservatory.org

ClimateObservatory.org is a website dedicated to providing official temperature data for thousands of cities around the world over the last 100 years.

ClimateObservatory.org gathers authoritative open data so you can explore global warming from both planetary indices and local weather-station histories. The project presents NASA GISTEMP for global land temperature anomalies, NOAA and ECAD for station-based series at city scale, Mauna Loa for atmospheric CO₂, and supporting dataset pages.

This edition is built with Next.js for clarity, performance, and accessibility while preserving the URL structure and SEO patterns established on the earlier site.

NASA GISTEMP: a global land temperature picture

The Goddard Institute for Space Studies Surface Temperature analysis (GISTEMP) combines weather station measurements with sea-surface data where applicable to describe how Earth’s temperature evolves relative to a chosen baseline period. On this site we focus especially on the long annual series for global land anomalies—useful for seeing the broad warming trend alongside local station records.

GISTEMP is not a substitute for a single city’s official climate normal: it answers a different question (large-scale averages and anomalies) than a chart for one observing site. Together, global indices and local series give complementary views of the same planetary shift.

Open the GISTEMP dataset page →

NOAA, ECAD, and thousands of city pages

For many places—particularly across North America and Europe—we plot annual mean temperatures from long-running stations archived under NOAA and ECAD (European Climate Assessment & Dataset). Each city page ties those series to metadata, charts, and links to the underlying JSON files when available.

The interactive map clusters station locations so you can discover pages geographically. These products are ideal for understanding how a specific observing site has evolved over decades, always keeping in mind gaps, relocations, and urban influences where they matter.

NOAA stations hub →ECAD stations hub →Full map →

Carbon dioxide and the Keeling record

Rising CO₂ is a central driver of long-term warming. We surface the Mauna Loa record (NOAA Global Monitoring Laboratory and related Scripps references) so visitors can see the latest monthly concentration and the iconic Keeling Curve in context.

View the CO₂ page →

English, French, and stable URLs

The site is bilingual: the English entry point is at the root (/), and the French mirror lives under /fr/…. Dataset hubs use /dataset/en/… and /dataset/fr/… paths. Alternate pages declare hreflang links for search engines, and routes such as /info and /fr/info are listed in the site map alongside thematic pages (GISTEMP, NOAA, ECAD, CO₂, and map).

Legacy paths still work: /about redirects permanently to /info, and /informations to /fr/info, so bookmarks and external links stay coherent.

Sections listed in the site map