Banana Hill is a suburb of Karuri town, in the eastern part of Kiambu County, Central Province of Kenya. It is in the Africa/Nairobi time zone. Banana Hill's population constitutes 20 percent of the estimated 100,000 residents within the heart of Kiambaa Constituency. Its location in the temperate Kenyan Highlands is thought to have been one of the major attractions for its former British colonizers. The area receives an average annual rainfall of 790 mm (31 in) with average temperatures ranging from 48–84 °F in January and 45–79 °F in July. Most mornings and evenings are chilly.