The most pleasant months of the year for the 21867 zip code are May, September and June. In the 21867 zip code, there are 4 comfortable months with high temperatures in the range of 70-85°. July is the hottest month for the 21867 zip code with an average high temperature of 88.5°, which ranks it as warmer than most places in Maryland. February is the snowiest month in the 21867 zip code with 2.3 inches of snow, and 4 months of the year have significant snowfall. The most uncomfortably humid months are July, August and June.