Tohickon Creek flows along the northern edge of the township into Lake Nockamixon at its northeastern edge and eastward into the Delaware River and drains most of East Rockhill.

17.1% of all households were made up of individuals, and 5.4% had someone living alone who was 65 years of age or older.

PA 313 follows a southeast-northwest alignment following Dublin Pike across northeastern portions of the township.

PA 563 follows a north-south alignment utilizing Ridge Road, Dublin Pike and Mountain View Drive across the eastern portion of the township.

Although most summer days are slightly humid in East Rockhill Twp, episodes of heat and high humidity can occur with heat index values > 104 °F (40 °C).

The average wettest month is July, which corresponds with the annual peak in thunderstorm activity.

During the winter months, the average annual extreme minimum air temperature is −2.8 °F (−19.3 °C).

Ice storms and large snowstorms depositing ≥ 12 inches (30 cm) of snow occur once every few years, particularly during nor’easters from December through February.

[13] The plant hardiness zone is 6b with an average annual extreme minimum air temperature of −2.8 °F (−19.3 °C).

[11] The spring bloom typically begins by April 14 and fall color usually peaks by October 26.