The most pleasant months of the year for Mier are September, June and August. In Mier, there are 5 comfortable months with high temperatures in the range of 70-85°. July is the hottest month for Mier with an average high temperature of 84.1°, which ranks it as about average compared to other places in Indiana. January is the snowiest month in Mier with 8.6 inches of snow, and 6 months of the year have significant snowfall. July is the most humid month, though humidity is low for most of the year.