Climate zones across Maryland
Climate zone shapes what insulation work homeowners ask about, so it shapes what a contractor should lead with. The number rises as the climate gets colder (1 is hot, 8 is subarctic). The letter shows moisture: A is humid, B is dry and C is marine. Maryland has 24 counties in 2 zones.
4A
22 counties
5A
2 counties
Source: U.S. DOE and PNNL, Guide to Determining Climate Zone by County: Building America and IECC 2021 Updates (PNNL-33270). As of October 21, 2022.
Cities we cover in Maryland
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