The most pleasant months of the year for the 21930 zip code are September, May and June. In the 21930 zip code, there are 3 comfortable months with high temperatures in the range of 70-85°. July is the hottest month for the 21930 zip code with an average high temperature of 87.0°, which ranks it as about average compared to other places in Maryland. February is the snowiest month in the 21930 zip code with 5.6 inches of snow, and 4 months of the year have significant snowfall. July is the most humid month, though humidity is low for most of the year.