The most pleasant months of the year for Myrtle are June, August and July. In Myrtle, there are 3 comfortable months with high temperatures in the range of 70-85°. July is the hottest month for Myrtle with an average high temperature of 81.6°, which ranks it as about average compared to other places in North Dakota. January is the snowiest month in Myrtle with 7.7 inches of snow, and 8 months of the year have significant snowfall. There are few days during the summer when the humidity becomes unpleasant.