 It may also be classified as humid continental (Dsa), if the boundary between continental and subtropical climate is an average January temperature of rather than .In an 1850 census of Davis County, almost half of the Farmington residents were from New York.In the 2010 census there were 18,275 people, 5,148 households, and 2,769 families residing in the city with an average family size of 3.41.