Trier has a mild temperature due to the effects of the North Atlantic Drift. As a result, summers stay quite cool, while winters are generally mild, with temperatures hovering around freezing. However, the best time to visit Trier is during spring and fall, March to May and October to November when the temperatures are cooler and more stable than those in summers. In spring and fall, prices for attractions and events are cheaper and the area is less crowded.
Summer: The warmest time of the year in Trier is in July when it is 18.4 degree Celsius.
Winter: The coldest time of the year in Trier is in January when it is 1.4 degree Celsius but can also go down to -0.9 degree Celsius.