 According to the United States Census Bureau, the city has a total area of , of which is land and , or 0.96%, is water.Lake-enhanced snowfall occurs frequently during the winter, and cool downslope mountain breezes occur on most summer evenings.Under the Köppen climate classification, Farmington experiences what may be classified as a hot-summer Mediterranean climate (Csa), despite not being on the west coast of an ocean like most Mediterranean climates.