Visiting local bars in Lier is more fun when you know what the weather holds. These rainfall averages and temperatures can help you determine the best time for bar-hopping. The hottest months are usually July and June, with an average temperature of 15°C, while the coldest months are January and February, with an average of -3°C. The snowiest months in Lier are January, December, February and October, with each month seeing an average of 43 cm of snowfall.