Their winter quarters are in the lower parts of Leon and Estremadura, La Mancha, and the lowlands of Andalusia, their summer quarters the more mountainous districts to the east and north (Plasencia in the province of Cceres, Avila, Segovia, Cuenca, Valencia), which are not so much affected by the summer droughts of the Peninsula.
The long, dry season (April to October), together with occasional devastating droughts (seccas) lasting two or more years, prevents the development of forests and damages the agricultural and pastoral industries of the state.
Owing to the absence of rivers, the paucity of springs, and the almost complete deforestation, Antigua is subject to frequent droughts, and although the average rainfall is 45.6 in., the variations from year to year are great.
Freshets and droughts at times work havoc. The former made notable 1844 and 1858; and the latter 1860, 1874 and 1894.
After prolonged droughts it still retains more or less the same figure as the surface, but at lower depths and always with less pronounced differences of level.