According to the United States Census Bureau, the township has a total area of 16.4 square miles, of which, 16.3 square miles of it is land and 0.1 square miles of it is water. It is in the Delaware watershed and, while most of West Rockhill is drained by the East Branch Perkiomen Creek and Unami Creek into the Perkiomen Creek and Schuylkill River, an area in the northeast portion drains via Threemile Run, Lake Nockamixon, and the Tohickon Creek eastward to the Delaware River. Other natural features include Butter Creek, Ingram Hill, Mill Creek, Ridge Valley Creek, and Rock Hill. The township's villages include Almont, Argus, Derstein, Knockthopher, Naceville Rich Hill, Ridge Valley, Rocky Ridge, Smoketown and White Horse.
Adjacent municipalities
Milford Township
Richland Township
East Rockhill Township
Perkasie
Sellersville
Hilltown Township
Telford
Franconia Township, Montgomery County
Salford Township, Montgomery County
Marlborough Township, Montgomery County
Climate
According to the Köppen climate classification system, West Rockhill Township, Pennsylvania has a hot-summer, wet all year, humid continental climate. Dfa climates are characterized by at least one month having an average mean temperature ≤ 32.0 °F, at least four months with an average mean temperature ≥ 50.0 °F, at least one month with an average mean temperature ≥ 71.6 °F, and no significant precipitation difference between seasons. During the summer months, episodes of extreme heat and humidity can occur with heat index values ≥ 100 °F. On average, the wettest month of the year is July which corresponds with the annual peak in thunderstorm activity. During the winter months, episodes of extreme cold and wind can occur with wind chill values < 0 °F. The plant hardiness zone is 6b with an average annual extreme minimum air temperature of -1.6 °F. The average seasonal snowfall total is between 30 and 36 inches, and the average snowiest month is February which corresponds with the annual peak in nor'easter activity.
As of the 2010 census, the township was 95.0% White, 1.1% Black or African American, 0.2% Native American, 1.4% Asian, and 0.9% were two or more races. 1.4% of the population were of Hispanic or Latino ancestry. As of the census of 2000, there were 4,233 people, 1,636 households, and 1,146 families residing in the township. The population density was 259.7 people per square mile. There were 1,701 housing units at an average density of 104.4/sq mi. The racial makeup of the township was 98.23% White, 0.54% African American, 0.14% Native American, 0.47% Asian, 0.14% from other races, and 0.47% from two or more races. Hispanic or Latino of any race were 0.59% of the population. There were 1,636 households, out of which 26.2% had children under the age of 18 living with them, 60.3% were married couplesliving together, 6.1% had a female householder with no husband present, and 29.9% were non-families. 25.7% of all households were made up of individuals, and 15.8% had someone living alone who was 65 years of age or older. The average household size was 2.47 and the average family size was 2.97. In the township the population was spread out, with 20.9% under the age of 18, 6.5% from 18 to 24, 25.9% from 25 to 44, 25.3% from 45 to 64, and 21.3% who were 65 years of age or older. The median age was 43 years. For every 100 females, there were 94.0 males. For every 100 females age 18 and over, there were 92.3 males. The median income for a household in the township was $50,948, and the median income for a family was $63,871. Males had a median income of $44,063 versus $30,306 for females. The per capita income for the township was $25,026. About 1.7% of families and 4.7% of the population were below the poverty line, including none of those under age 18 and 11.0% of those age 65 or over.
