The most pleasant months of the year for Lamar are September, June and May. In Lamar, there are 3 comfortable months with high temperatures in the range of 70-85°. July is the hottest month for Lamar with an average high temperature of 89.9°, which ranks it as one of the hottest places in Nebraska. March is the snowiest month in Lamar with 5.0 inches of snow, and 7 months of the year have significant snowfall. There are few days during the summer when the humidity becomes unpleasant.