Climate of Spain

Typical Mediterranean climate

The Csa hot-summer mediterranean climate is found on most of the coast of Spain starting from the border with Portugal to the border with France, with a few exceptions. The Csb warm-summer mediterranean climate is found in Galicia and the western areas of Castilla y Leon. Coastal Mediterranean region is marked by Leveche winds: hot, dry, easterly or southeasterly air currents that originate over North Africa. Periods of these winds, which sometimes carry fine Saharan dust, are more common in spring and are associated with a sudden, usually short-lived, increase in temperature. A cooler easterly wind, the Levante, funnels between the Sistema Penibetico and the Atlas Mountains of North Africa. These easterly winds are the ones which most influence the Mediterranean climate. The summers are hot, the winters are mild and most of precipitation falls in the autumn. Examples of cities with Csa climate are Madrid, Barcelona, Valencia, Sevilla or Malaga.

The most populous city with Csb climate in Spain is Vigo. Other smaller cities with this climate are A Coruña, León or Salamanca.

Inland Mediterranean climate

The inland areas of the Iberian Peninsula, on the Central Plateau, have a Csa or Csb mediterranean climates (other areas have BSk semi-arid climates) with bigger differences and seasonalities than the coast. The summers are usually hotter than in the coast and in overall very hot, regularly exceeding 35 °C (95 °F). By contrast, there are low temperatures in winter, from cool to cold winters, being not uncommon the temperatures below 0 °C (32 °F). At cities with altitude above 1,000m like Álava or Segovia, the temperatures under −5 °C (23 °F) are not uncommon, dropping up to −10 °C (14 °F) or more during artic cold waves. The cold increases at higher the altitude is. These are often accompanied by moderate snowfall. Although it rarely rains during summer, there is often heavy rainfall in spring and autumn. Cities with this climate are Madrid, Badajoz, Ciudad Real, Logroño and Ávila.

Oceanic climate

An oceanic climate prevails from the Pyrenees to the Asturias, area which incorporating Galicia is sometimes called "Green Spain", characterised by relatively mild winters and warm summers. The climate and landscape are determined by the Atlantic Ocean winds whose moisture gets trapped by the mountains circumventing the Spanish Atlantic coast. Because of the Foehn effect, the southern slopes fall inside the rain shadow zone and so Green Spain contrasts starkly with the rest of Spain. But the summers remain warmer than many comparable North-west European regions (about 21 °C (69.8 °F) in July in Santander versus 16 °C (60.8 °F) in Brest or Liverpool). The rainfall is generally abundant, exceeding 1,000 mm (39.4 in) and is fairly evenly spread out over the year, with the driest month above 30 mm (1.2 in), which is the minimum criteria for an oceanic climate according to Köppen. Although Köppen officially limits the oceanic domain to the Asturias and the Basque Country region, certain authors such as Trewartha prefer to extend this climatic zone to the north-west part of the peninsula to Galicia, due to the moderate summer temperatures.

Temperatures vary only slightly, both on a diurnal and a seasonal basis, and averages range from 9 °C (48.2 °F) in January to 21 °C (69.8 °F) in July. The moderating effects of the sea are less prominent further inland, where temperatures are more extreme than those on the coast. Distance from the Atlantic Ocean also has an effect on precipitation levels, so there is less rainfall in the east than in the west. Autumn (October to December) is the wettest season, while July is the driest month. The high humidity and the prevailing off-shore winds make fog and mist common along the north west coast; this phenomenon is less frequent a short distance inland because the mountains form a barrier to the maritime moisture.

Galician variant

The Galician climate (Csb) is similar to that of the coastal areas of Oregon, Washington and Vancouver. It is characterised by year-round mild temperatures with drier summer months, often resulting in moderate drought conditions with at least one month per year usually recording less than 40 mm (1.6 in). This is a characteristic which distinguishes Galicia from a typical Cfb climate. Annual rainfall is higher than in the eastern and southern regions, usually ranging from 800 to 2,000 mm (31.5 to 78.7 in). This climate, which is sometimes classified as "Mediterranean", is classified as "Oceanic" according to other authors such as Trewartha, due to the lower summer temperatures and higher rainfall. Nonetheless, the area displays typical Mediterranean features, including regular forest fires, which are often started deliberately by arsonists. Galicia has high annual sunshine hours, ranging from 1800 hours in the north east to 2200 in the south west.

In North-West Castilla, the climate is classified also as Csb because the temperatures of summer are cooler due to the altitude.

Semiarid climate

The semiarid climate (BSk and BSh in the Köppen climate classification) is predominant in south-eastern Spain (covering most of Alicante, Murcia and Almería provinces), and in certain parts of the Ebro Valley. It is also present in parts of the centre, south and west of the country which borders between a mediterranean and semiarid climate. It is very hot during the summer (temperatures can exceed 40 °C (104 °F) and the drought usually extends into the autumn (rainfall about 300 mm - ).

Arid climate

The desert climate exists in a few zones of the south-eastern coast of Spain. It appears predominantly in Almería, with the city of Almería falling under the hot desert climate categorization (Köppen: BWh) as the average temperature is 19.1 ºC and the average rain amount is of 200mm. This area extends to the Almanzora valley and the Cabo de Gata, which are also known for having also a BWh desertic climate, with rainfall as low as 156 mm (6.1 in) a year which is reportedly the driest place in Europe. The desert climate exists in other areas of the South East, as the Tabernas Desert, which has an annual average of 17.9 ºC placing it just 0.1 ºC below under the categorization of BWh hot desert climate, so it has a cold desert climate (Köppen: BWk). In areas of Murcia and specific points of the province of Alicante (near Torrevieja).

Other types

Besides the above three major climate zones, there are four other climate types in Spain:

The southern Mediterranean coast (Malaga and Granada's coastal strip) shares traits with both Mediterranean and Subtropical zones, with total absence of winter frosts allowing for the prolific cultivation of tropical fruits such as Mango. The unusually benign winter, with minimum night temperatures in January rarely falling below 8 °C (46 °F) is due to the microclimate created by the Sierra Nevada mountains to the north of this coastal strip, preventing cooler north winds from reaching the area.

Parts of the south East coast also have a Hot Arid climate, with annual average temperatures above 18 °C and annual rainfall below 200mm. Almeria province is the only area in Europe within this climatic zone.

Extreme temperature records in selected cities

The records of temperatures in Spain have been, −32 °C (−26 °F) in Lago Estangento in the Pyrenees (Lleida) for the coldest, for the hottest 47 °C (117 °F) in Seville and Écija.