Peak spring foliage usually occurs during the month of April, which correlates with the typical date of last freeze.Bucks County has four distinct seasons and has a hot-summer humid continental climate (Dfa) except for some far southern lowlands which have a humid subtropical climate (Cfa). Monthly climatic averages (1981 - 2010) for Quakertown, upper Bucks County, PA (elevation 497 feet). The population density was 1,034.7 people per square mile.The fall foliage season typically peaks in mid-October in northern Bucks, mid-late October in central Bucks, and late-October / early-November in southern Bucks.These dates correlate with the typical date of first freeze.Some places in Bucks County were named after locations in Buckinghamshire, including Buckingham Township, named after the county town of Buckinghamshire; Chalfont, named after Chalfont St Giles, the parish home of William Penn's first wife and the location of the Jordans Quaker Meeting House, where Penn is buried; Solebury Township, named after Soulbury, England; and Wycombe, named after the town of High Wycombe.Bucks County was originally much larger than it is today.
There were 225,498 housing units at an average density of 371 per square mile (143/km²).
Penn named the county after Buckinghamshire, the county where he lived in England.
He built a country estate called Pennsbury Manor in Falls Township, Bucks County.
Northampton County was formed in 1752 from part of Bucks County, and Lehigh County was formed in 1812 from part of Northampton County.
General George Washington and his troops camped in Bucks County as they prepared to cross the Delaware River to take Trenton, New Jersey, by surprise on the morning of December 26, 1776.
The racial makeup of the county was 86.6% White non-Hispanic, 3.9% Black or African American, 0.3% Native American, 4.1% Asian (2.1% Indian, 1.1% Chinese, 0.7% Korean, 0.5% Filipino, 0.3% Vietnamese, 0.1% Japanese, 0.4% other Asian) 0.1% Pacific Islander, 1.7% were of two or more races, and 1.5% were of other races.