Climatic conditions depend on location and altitude. Temperatures range from an average of about -7 to -1°c (20 to 30°f) in winter to about 18 to 24°c (65 to 75°f) in July. Rainfall ranges from more than 102 cm (50 in) annually in the western mountains to less than 66 cm (26 in) in the driest region, near Vienna. Austria is one of Europe's most heavily wooded countries, with 47% of its area under forests.