Millers, MarylandMillers is an unincorporated community in Carroll County, Maryland, United States. The Jacob F. Shaffer Farm was listed on the National Register of Historic Places in 1998.ClimateAccording to the Köppen Climate Classification system, Millers has a humid subtropical climate, abbreviated "Cfa" on climate maps. The hottest temperature recorded in Millers was on July 22, 2011, while the coldest temperature recorded was on January 19, 1994.