Purmela is an unincorporated community in Coryell County, Texas, United States. The community is part of the Killeen?Temple?Fort Hood Metropolitan Statistical Area. Although it is unincorporated, Purmela has a post office, with the ZIP code of 76566.The climate in this area is characterized by hot, humid summers and generally mild to cool winters. According to the K�ppen Climate Classification system, Purmela has a humid subtropical climate, abbreviated "Cfa" on climate maps.