ClimavisoSpain's weather warnings in 2021
Full year, 1 January to 31 December 2021.
In 2021, Spain's 182 warning zones added up to 9,371 zone-days with a warning: 7,592 yellow, 1,640 orange and 139 red. Somewhere in Spain had a warning on 329 of the year's 365 days.
Highlights
- 2021 had the most zone-days with a snow warning of any year from 2019 to 2025: 941. Next was 2020, with 712.
- 2021 had the most zone-days with a red warning of any year from 2019 to 2025: 139. Next was 2025, with 113.
- 2021 had the fewest zone-days with a heat warning of any year from 2019 to 2025: 1,768. The median was 2,552.
By warning type, year by year
All warnings
9,371
Red warningshigh
139
Rain
2,985
Storms
2,471
Wind
2,403
Heat
1,768
Cold
985
Snowhigh
941
Fog
211
Dust
56
Each bar is a full year. The dark bar is 2021.
Month by month
Zone-days with a warning each month. The tick marks the 2019–2025 median for that month.
The red warnings of 2021
23 days with a red warning somewhere; 139 zone-days in all.
- 28 November red for snow Centro de Navarra, Centro y valle de Villaverde, Llanada alavesa
- 27 November red for snow Centro de Navarra, Centro y valle de Villaverde, Llanada alavesa
- 23 November red for rain Prelitoral sur de Tarragona
- 23 September red for rain Litoral de Huelva
- 29 August red for rain Litoral sur de Castellón
- 17 August red for heat Este, sur y oeste de Gran Canaria, Este, sur y oeste de Tenerife, Oeste de La Palma
- 16 August red for heat El Hierro, Este, sur y oeste de Gran Canaria, Este, sur y oeste de Tenerife, La Gomera, Oeste de La Palma
- 15 August red for heat Altiplano de Murcia, Andévalo y Condado, Campiña cordobesa, Campiña sevillana, Cazorla y Segura, Cuenca del Genil, Este, sur y oeste de Gran Canaria, Hellín y Almansa, Interior norte de Valencia, La Mancha albaceteña, Litoral sur de Alicante, Morena y Condado, Sierra de Madrid, Sierra sur de Sevilla, Sierra y Pedroches, Subbética cordobesa, Valle del Guadalentín, Lorca y Águilas, Valle del Guadalquivir de Jaén, Vega del Segura
- 14 August red for heat Altiplano de Murcia, Andévalo y Condado, Campiña cordobesa, Campiña gaditana, Campiña sevillana, Cazorla y Segura, Cuenca del Genil, Depresión central de Lleida, Ibérica zaragozana, Interior norte de Valencia, La Mancha albaceteña, La Mancha conquense, Morena y Condado, Ribera del Ebro de Zaragoza, Serranía de Cuenca, Sierra de Madrid, Sierra sur de Sevilla, Sierra y Pedroches, Subbética cordobesa, Sur de Huesca, Sur, Vegas y Oeste, Valle del Guadalquivir de Jaén, Valle del Tajo, Vegas del Guadiana
- 13 August red for heat Campiña cordobesa, Campiña sevillana, Cuenca del Genil, Guadix y Baza, Morena y Condado, Valle del Guadalquivir de Jaén
- 12 August red for heat Depresión central de Lleida, Pirineo de Lleida, Ribera del Ebro de Zaragoza
- 23 July red for heat Bajo Aragón de Teruel, Ribera del Ebro de Zaragoza
- 12 July red for heat Litoral sur de Alicante, Litoral sur de Valencia, Vega del Segura
- 6 March red for rain Ceuta, Sol y Guadalhorce
- 5 March red for rain Ceuta, Sol y Guadalhorce
- 15 January red for cold Parameras de Molina
- 14 January red for cold Albarracín y Jiloca, Ibérica zaragozana, Parameras de Molina
- 13 January red for cold Albarracín y Jiloca, Ibérica zaragozana, Parameras de Molina
- 12 January red for cold Albarracín y Jiloca, Alcarria conquense, Alcarria de Guadalajara, Gúdar y Maestrazgo, Ibérica de Burgos, Ibérica zaragozana, La Mancha albaceteña, La Mancha conquense, La Mancha toledana, Meseta de Burgos, Meseta de Segovia, Meseta de Soria, Meseta de Ávila, Metropolitana y Henares, Parameras de Molina, Serranía de Cuenca, Serranía de Guadalajara, Sistema Central de Soria, Sistema Central de Ávila, Sur, Vegas y Oeste, Valle del Tajo
- 11 January red for cold Albarracín y Jiloca, Ibérica zaragozana
- 10 January red for snow Bajo Aragón de Teruel, Depresión central de Tarragona, Interior norte de Castellón, Prelitoral sur de Tarragona, Ribera del Ebro de Zaragoza
- 9 January red for snow Alcarria conquense, Alcarria de Guadalajara, Bajo Aragón de Teruel, Depresión central de Tarragona, Interior norte de Castellón, Interior norte de Valencia, Interior sur de Castellón, Interior sur de Valencia, La Mancha albaceteña, La Mancha conquense, La Mancha toledana, Metropolitana y Henares, Prelitoral sur de Tarragona, Ribera del Ebro de Zaragoza, Sur, Vegas y Oeste, Valle del Tajo
- 8 January red for snow Alcarria conquense, Alcarria de Guadalajara, Interior norte de Valencia, Interior sur de Valencia, La Mancha albaceteña, La Mancha conquense, La Mancha toledana, Metropolitana y Henares, Sur, Vegas y Oeste, Valle del Tajo
The zones with the most warning days
| Zone | Province | Warning days | Orange | Red |
|---|---|---|---|---|
| Pirineo de Lleida | Lleida | 123 | 27 | 1 |
| Pirineo oscense | Huesca | 123 | 39 | 0 |
| Interior norte de Castellón | Castelló/Castellón | 99 | 19 | 2 |
| Gúdar y Maestrazgo | Teruel | 99 | 15 | 1 |
| Prelitoral sur de Tarragona | Tarragona | 95 | 23 | 3 |
| Pirineo de Girona | Girona | 95 | 20 | 0 |
| Valle de Arán | Lleida | 86 | 20 | 0 |
| La Mancha albaceteña | Albacete | 85 | 11 | 5 |
| Albarracín y Jiloca | Teruel | 81 | 24 | 4 |
| Cordillera Cantábrica de León | León | 81 | 15 | 0 |
By region
| Region | Zones | Warning days per zone | Earlier years | Change |
|---|---|---|---|---|
| Aragón | 9 | 82 | 89 | -9% |
| Illes Balears | 7 | 71 | 69 | +3% |
| Cataluña | 16 | 70 | 76 | -8% |
| Comunitat Valenciana | 11 | 64 | 61 | +5% |
| Comunidad Foral de Navarra | 4 | 62 | 69 | -10% |
| Comunidad de Madrid | 3 | 61 | 73 | -16% |
| La Rioja | 2 | 60 | 69 | -14% |
| Castilla y León | 24 | 57 | 64 | -12% |
| Castilla - La Mancha | 17 | 56 | 61 | -8% |
| Cantabria | 4 | 56 | 52 | +7% |
| Canarias | 13 | 45 | 43 | +6% |
| Región de Murcia | 5 | 45 | 45 | +1% |
| Principado de Asturias | 5 | 44 | 37 | +18% |
| País Vasco | 7 | 39 | 44 | -12% |
| Extremadura | 8 | 38 | 51 | -26% |
| Galicia | 16 | 37 | 42 | -12% |
| Andalucía | 29 | 35 | 45 | -24% |
| Ciudad de Melilla | 1 | 17 | 18 | -5% |
| Ciudad de Ceuta | 1 | 10 | 20 | -49% |
Average warning days per zone. “Earlier years” is the average of the other full years since 2019.
How to read these numbers
A zone-day is one warning zone with a warning on one day. Spain has 182 zones: ten zones warned on the same day make ten zone-days. A day with several warnings in one zone counts once, at its highest level; each warning type counts once per type.
A warning is a forecast, not a measurement: it says a threshold is expected to be exceeded in a zone. Each zone has its own thresholds (a yellow heat warning doesn't start at the same temperature in Asturias as in Córdoba), so these numbers count how often a warning was issued, not how hot or wet it was. For measured temperature and rain, see AEMET's climate summaries.
Thresholds have barely changed: according to Maldita, maximum-temperature thresholds have changed in only 10 of the 182 zones since 2006, always upwards. More heat warnings are not explained by lower thresholds.
The archive starts on 18 June 2018, so comparisons start in 2019. More on levels, thresholds and zones in how warnings work.
To cite: “Climaviso, from AEMET warnings”.
Other years
2026, so far · 2025 · 2024 · 2023 · 2022 · 2021 · 2020 · 2019
Sources
- Warnings: AEMET's warning archive (CAP format, AEMET OpenData), collected by Climaviso since June 2018.
- Warning levels and issue times: AEMET, how to read warnings (Spanish).
- Threshold changes: Maldita, 5 September 2024 (Spanish).