Information Center

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Blog

Articles about meteorology, hydrology, reservoirs, warning systems, and severe-weather preparedness.

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Frequently Asked Questions

We answer your questions about how WhatAWeather works, what warnings mean, and how to use the site.

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Glossary

Dictionary of meteorological and hydrological terms to help you understand the data you see.

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Legal Notice

Information about the website operator and general terms.

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Privacy Policy

How we process and protect your personal data in accordance with GDPR.

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Information about cookies and similar technologies that we use.

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Terms of Use

Terms and conditions for using the WhatAWeather system.

What is on this site, section by section

Each section is built from a specific source and a method you can check. These are the main ones and what each contains:

Forecast by city — 61 pages with the seven-day forecast and AEMET’s 1991-2020 climatological normals from the nearest observatory.

Weather month by month — 60 city-and-month pages with averages, records and where that month sits in the year.

Reservoirs and basins — Water in storage by reservoir and by basin, from the Spanish Ministry for the Ecological Transition.

Heatwaves — The extreme-heat threshold specific to each region, computed from thirty years of ERA5-Land, and how it has shifted by decade.

Wildfire risk — Days a year of fire-prone weather by region, and which fire regime is normal in each.

Snow level — Where the zero-degree isotherm sits in each range and how far it has risen in thirty years.

Beaches — Today’s beach index and month-by-month climatology of sea temperature, waves, wind and sunshine for 30 beaches.

Surf — Wave climatology by spot, with the wave cells taken offshore.

Named storms and DANAs — A page for each named storm, measured against thirty years of reanalysis.

Pollen — Calendar of the main allergenic species by area.

Tools — Calculators and comparators: Manning discharge, water balance, flood risk, model comparison, unit converter.

The source of every figure, the data licences and the known limitations of each method are set out in Sources and methodology, together with the corrections published whenever we have found a mistake of our own.

How what you read here is produced

There are two kinds of figure on this site and it is worth telling them apart, because they read differently. A forecast comes from numerical models and changes every few hours: it says what is going to happen, with the uncertainty that carries. Climatology comes from long series — AEMET’s 1991-2020 normals for Spanish cities, the European Centre’s ERA5 and ERA5-Land reanalyses for everything else — and does not change: it says what has happened on average, and it is what tells you whether what is coming is normal.

Confusing the two is the commonest mistake in reading any weather site. That the July average in Seville is 36 °C does not mean next Tuesday will reach 36 °C; it means that if Tuesday reaches 41 °C, that is five degrees above normal — and that context is what turns a number into information.

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