created as planned communities, which were given proper names, but no well-defined borders. List of villages: Spatial planning Aalen forms a Mittelzentrum ("medium-level centre") within the Ostwürttemberg region. Its designated catchment area includes the following municipalities of the central and eastern Ostalbkreis district: Abtsgmünd, Bopfingen, Essingen, Hüttlingen, Kirchheim am Ries, Lauchheim, Neresheim, Oberkochen, Riesbürg and Westhausen, and is interwoven with the catchment area of Nördlingen, situated in Bavaria, east of Aalen. Climate As Aalen's territory sprawls on escarpments of the Swabian Jura, on the Albuch and the Härtsfeld landscapes, and its elevation has a range of , the climate varies from district to district. The weather station the following data originate from is located between the town centre and Wasseralfingen at about and has been in operation since 1991. The sunshine duration is about 1800 hours per year, which averages 4.93 hours per day. So Aalen is above the German average of 1550 hours per year. However, with 167 days of precipitation, Aalen's region also ranks above the German average of 138. The annual rainfall is , about the average within Baden-Württemberg. The annual mean temperature is . Here Aalen ranks above the German average of and the Baden-Württemberg average of . History Civic history First settlements Numerous remains of early civilization have been found in the area. Tools made of flint and traces of Mesolithic human settlement dated between the 8th and 5th millennium BC were found on several sites on the margins of the Kocher and Jagst valleys. On the Schloßbaufeld plateau (appr. ), situated behind Kocherburg castle near Unterkochen, a hill-top settlement was found, with the core being dated to the Bronze Age. In the Appenwang forest near Wasseralfingen, in Goldshöfe, and in Ebnat, tumuli of the Hallstatt culture were found. In Aalen and Wasseralfingen, gold and silver coins left by the Celts were found. The Celts were responsible for the fortifications in the Schloßbaufeld settlement consisting of sectional embankments and a stone wall. Also, Near Heisenberg (Wasseralfingen), a Celtic nemeton has been identified; however, it is no longer readily apparent. Roman era After abandoning the Alb Limes (a limes generally following the ridgeline of the Swabian Jura) around 150 AD, Aalen's territory became part of the Roman Empire, in direct vicinity of the then newly erected Rhaetian Limes. The Romans erected a castrum to house the cavalry unit Ala II Flavia milliaria; its remains are known