called Rainbow Outside the formal suburbs, shanty towns symbolise the rapid urbanisation of the town and high unemployment rates. Kehemu (Ghetto), Kaisosi (also known by the locals as Cali), Sauyemwa (SA), and Ndama are the most informal areas while a fourth, Donkerhoek (Dark Corner), is rapidly becoming formal since the start of the Build Together Campaign in 1992. Climate Rundu has a hot semi-arid climate (Köppen: BSh), with hot summers and relatively mild winters (with warm days and chilly to cool nights). Even though it has a hot semi-arid climate, the area experiences high diurnal temperature variation during the winter with average high temperatures at roughly and average low temperatures at . This large swing in daily temperature is more commonplace among areas with cold semi-arid climates. During the summer, the diurnal temperature variation is less pronounced. The average annual precipitation is , although in the 2010/2011 rainy season were measured. Economy and infrastructure Rundu Open Market Rundu Open Market is the most well-known and biggest open market in the town. It was founded in 1996 through cooperation between the government of Namibia and the government of Luxembourg. Transport Rundu Airport, mostly used for tourism and cargo, is southwest of the town. The Rundu State Hospital is situated in the center of the town, off Markus Siwarongo street. It's the largest hospital in Kavango East. Military There is a military base of the Namibian Defence Force in Rundu. Built in 1972 and expanded in 1976, while South West Africa was under South African occupation, it houses 1,600 soldiers. The base was named Voito Jason Kondjeleni Military Base, after People's Liberation Army of Namibia (PLAN) fighter Voito Jason Kondjeleni who died in 1983. Education and Culture Rundu is home to many woodcarvers and features a woodcarver's market near the open market. Several local restaurants serve traditional food, including mahangu, ground nuts, stewed meats, and fish from the Okavango River. Schools There are five tertiary Institutions in Rundu, namely the Rundu College of Education, the Institute of Open Learning (IOL), the Rundu Vocational Training Centre, the Namibia College of Open Learning (NAMCOL) and Triumphant College. The University of Namibia and Polytechnic of Namibia both maintain centres that provide support for students who are studying on distance. There are six secondary schools in the town: Rundu Secondary School, Dr. Alpo Mbamba Secondary School, Dr. Romanus Kampungu Secondary School, Elias Neromba Senior Secondary School,