Three main climatic zones can be separated, according to geographical situation and orographic conditions:

The Mediterranean climate, characterised by warm/hot and dry summers, is dominant in the peninsula. It has two varieties: Csa and Csb according to the Köppen climate classification.

The Csa zone is associated to areas with hot summers. It is predominant in the Mediterranean and Southern Atlantic coast and inland throughout Andalusia, Extremadura and much, if not most, of the centre of the country. The Csa zone covers climatic zones with both warm and cool winters which are considered extremely different from each other at a local level, reason for which Köppen classification is often eschewed within Spain. Local climatic maps generally divide the Mediterranean zone (which covers most of the country) between warm-winter and cool-winter zones, rather than according to summer temperatures.

The Csb zone has warm rather than hot summers, and extends to additional cool-winter areas not typically associated with a Mediterranean climate, such as much of central and northern-central of Spain (e.g. western Castile–León, northeastern Castilla-La Mancha and northern Madrid) and into much rainier areas (notably Galicia). Note areas with substantial summer rainfall such as Galicia are classed as oceanic.

The semi-arid climate (BSk, BSh), is predominant in the southeastern quarter of the country, but is also widespread in other areas of Spain. It covers most of the Region of Murcia, southern Valencia and eastern Andalusia. Further to the north, it is predominant in the upper and mid reaches of the Ebro valley, which crosses southern Navarre, central Aragon and western Catalonia. It also is found in Madrid, Extremadura, Castilla-La Mancha, and some locations of western Andalusia. The dry season extends beyond the summer and average temperature depends on altitude and latitude.

The oceanic climate (Cfb), located in the northern quarter of the country, especially in the Atlantic region (Basque Country, Cantabria, Asturias, and partly Galicia and Castile–León). Additionally, it is also found in northern Navarre, in most highlands areas along the Iberian System and in the Pyrenean valleys, where a humid subtropical variant (Cfa) also occurs. Winter and summer temperatures are influenced by the ocean, and have no seasonal drought.

Apart from these main types, other sub-types can be found, like the alpine climate in areas with very high altitude, the humid subtropical climate in areas of northeastern Spain and the continental climates (Dfc, Dfb / Dsc, Dsb) in the Pyrenees as well as parts of the Cantabrian Range, the Central System, Sierra Nevada and the Iberian System, and a typical desert climate (BWk, BWh) in the zone of Almería, Murcia and eastern Canary Islands. Low-lying areas of the Canary Islands average above 18.0 °C (64.4 °F) during their coolest month, thus having a tropical climate.