like the city of luxembourg, vianden (altitude ca. 200 m) has a temperate climate with warm summers (average day temperature around 24°c, on occasion as high as 35 °c) and chilly winters (daytime average 5 °c but sometimes as low as −15 °c at night). rainfall is moderate, but on average it rains less than 10 days per month. the prevailing wind is south-westerly.