Measurable snow (≥0.1 in or 0.25 cm) only occurs several times per decade at the most however freezing rain is more common; a snowfall/freezing rain event on January 3, 2018 was the first such event in Charleston since December 26, 2010.The highest temperature recorded within city limits was 104 °F (40 °C) on June 2, 1985, and June 24, 1944, and the lowest was 7 °F (−14 °C) on February 14, 1899.The dewpoint in June to August ranges from 67.8 to 71.4 °F (19.9 to 21.9 °C). Census, the metropolitan statistical area had a total population of 712,239 people.The Charleston–North Charleston–Summerville Metropolitan Statistical Area consists of three counties: Charleston, Berkeley, and Dorchester. North Charleston is the second-largest city in the Charleston–North Charleston–Summerville Metropolitan Statistical Area and ranks as the third-largest city in the state; Mount Pleasant and Summerville are the next-largest cities. John's Parish, although the last two are mostly still incorporated rural parishes.
Charleston Harbor runs about 7 miles (11 km) southeast to the Atlantic with an average width of about 2 miles (3.2 km), surrounded on all sides except its entrance.
Charleston has a humid subtropical climate (Köppen climate classification Cfa), with mild winters, hot, humid summers, and significant rainfall all year long.
Summer is the wettest season; almost half of the annual rainfall occurs from June to September in the form of thundershowers.
Despite its size, it remained unincorporated throughout the colonial period; its government was handled directly by a colonial legislature and a governor sent by London.
Election districts were organized according to Anglican parishes, and some social services were managed by Anglican wardens and vestries.