The so-called foehn is a weather phenomenon particular to the region near to the Alps that occasionally brings warmer and drier air from the south to Olching, potentially occurring at any time of year. This is accompanied by extremely good visibility, in particular the much-clichéd Bavarian blue and white sky, and the Bavarian Alps may be clearly visible, apparently close-by, although they are approximately 100 kilometres (60 mi) away to the south. Some people suffer from headaches and circulatory problems as a result of the foehn.