Geography and urban development of Dresden temperatures are almost the same as those in cities in southwest Germany; on average 10.2°C per year. In hot summers, Dresden is between the hot Lusatia and the milder Ore Mountains. Both regions are characterised by strong winters: temperatures of −20°C are not impossible in Dresden. The driest months are February and March, with precipitation of 40 mm. Spring months have often been arid in the last couple of years (with less than 10 mm of precipitation). The most precipitation falls in July and August, at 60 mm per month. Due to its location on the banks of the Elbe
General German Workers' Association establishment of the German Empire. Its members were known colloquially throughout Germany as Lassalleans. The ADAV was founded in Leipzig by Ferdinand Lassalle and twelve delegates from some of the most important cities in Germany, namely Barmen, Dresden, Düsseldorf, Elberfeld, Frankfurt am Main, Hamburg, Harburg, Cologne, Leipzig, Mainz and Solingen. The ADAV sought to advance the interests of the working class and to work for the establishment of socialism by the use of electoral politics. Lassalle acted as president from 23 May 1863 until his death in a duel on 31 August 1864. The unofficial organ of the ADAV was