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Climate of South Carolina

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South Carolina has a humid subtropical climate, with hot summers throughout most of the State. Mild winters predominate in the eastern and southern part of the state, but cool to occasionally cold winters are the standard in the northwestern area of the state, especially areas at or above 600 feet in elevation. On average, between 40 and 80 inches (1,000 and 2,000 mm) of precipitation falls annually across the state. Tropical cyclones, and afternoon thunderstorms due to hot and humid conditions, contribute to precipitation during the summer and sometimes fall months, while extratropical cyclones contribute to precipitation during the fall, winter, and spring months. The coast experiences nearly all of their tropical weather impacts from storms coming directly from the Atlantic coast. The northwestern area of the state can receive impacts from both Atlantic basin storms moving westward from the coast and also occasionally very heavy rainfall and flooding from storms originating from the Gulf of Mexico that move inland towards the northeast after making landfall from the Florida Panhandle to Louisiana.

Temperatures

South Carolina has a humid subtropical climate (Köppen climate classification Cfa), although high elevation areas in the "Upstate" area have less subtropical characteristics than areas on the Atlantic coastline. Some high-altitude, northern parts of the state have a subtropical highland climate (Köppen climate classification Cfb). In the summer, South Carolina is hot and humid with temperatures during the day averaging near 90 °F (32 °C) across most of the state with overnight lows near 70 °F (21 °C). Winter temperatures are much less uniform. Coastal areas of the state have very mild winters with high temperatures averaging about 60 °F (16 °C) and overnight lows close to 38 °F (3 °C). Further inland in the Piedmont, temperatures average between 50 °F (10 °C) during the day and 32 °F (0 °C) at night.

South Carolina Köppen climate map

Tornadoes happen mostly in the spring, with a secondary peak in November. Hail and damaging winds often occur in summertime thunderstorms. Tornadoes are very uncommon in the summer unless a tropical disturbance were to spawn one.

Event Measurement Date Location County
Highest temperature[1][2] 113 °F (45.0 °C) Jun. 29, 2012 USC Columbia Richland, South Carolina
Lowest temperature[3][4] −19 °F (−28.3 °C) January 21, 1985 Caesars Head Greenville

Precipitation

Annual average precipitation in South Carolina

While precipitation is abundant the entire year in almost the entire state, the coastline tends to have a slightly wetter summer, while inland March tends to be the wettest month. During the cold season, extratropical cyclones is the main cause of precipitation, while during the summer, tropical cyclones and thunderstorms forming due to afternoon heating are the main causes of precipitation. A lee side rain shadow from the Appalachian Mountains lowers annual precipitation across central portions of the state.[5] Inland sections average 40 inches (1,000 mm) to 50 inches (1,300 mm) of rainfall, while near the coast 50 inches (1,300 mm) to 60 inches (1,500 mm), and the Piedmont receives 70 inches (1,800 mm) to 80 inches (2,000 mm) of precipitation.[6] Winter precipitation is determined in large by the El Niño-Southern Oscillation. During El Niño events, the jet stream is further south and east across the U.S., thus leading to cooler and wetter winters in South Carolina, while La Niña keeps the jet stream further north and west causing warmer and drier winters.

Event Measurement Date Location County
Most precipitation in a year for a single area 123.45 inches (3,136 mm) 2018 [7] Walhalla State Fish Hatchery Oconee
Least precipitation in a year for a single area 22.69 inches (58 cm) ?
Event Measurement Date Location County
Greatest 24-hour rainfall[8][9][10] 14.80 inches (376 mm) September 16, 1999 Myrtle Beach Horry

Snowfall and ice

Annual snowfall across South Carolina varies greatly in frequency and amounts, from being quite rare with little to no accumulation in the southern coastal areas to being very common annually with 2 to 3 small snowfall events in the Upstate, particularly along and north of Interstate 85, which essentially is built along the 850 to 900 feet elevation contour. In the southern coastal area near and below Charleston, several years might pass without any measurable snowfall. In the Greenville, Spartanburg, and Anderson areas, total annual amounts range from 2 to 5 inches, with occasional annual totals reaching 8 or more inches (cumulatively). A year without at least one snow event in the Upstate is quite unusual. The Midlands is the least predictable area of the state in experiencing snowfall events. About 5 out of every 10 years, the region will have no snowfall at all; however in the 5 out of 10 years that the region receives snow, the accumulations are anywhere from under an inch to occasionally as much as 4 to 5 inches. The snowiest location in the state, above 2,000 feet in elevation, averages 12 inches (30 cm) of snow a year in the Blue Ridge Escarpment area. Freezing rain is more common than snow around and southeast of Columbia. Along the southern coastal barrier islands, frozen precipitation of any type is very rare, with only a few snow events on record.

Event Measurement Date Location County
Greatest 24-hour snowfall[11] 24 inches (61 cm) February 10–11, 1973 Rimini Clarendon
Most snowfall from one storm [12] 28.9 inches (73 cm) February 15–17, 1969 Caesars Head Greenville

Tropical cyclones

Hurricane Hugo (1989)

The state is prone to tropical cyclones. This is an annual concern during hurricane season, which is from June through November. The peak time of vulnerability for the southeast Atlantic coast is from early August to early October when tropical cyclone frequency is highest.[13] Major hurricanes can impact the Palmetto state, though there are no category 5 impacts on record.[14] Two of the stronger hurricanes to strike South Carolina in recent times are Hurricane Hazel (1954) and Hurricane Hugo (1989), which were of category 4 strength. For weaker systems, rainfall and spin-up tornadoes in the outer bands are the main impacts to the state. The wettest known tropical cyclone to impact South Carolina was a tropical depression named Jerry in 1995 which stalled nearby and had previously been a tropical storm across Florida.[15] Jerry brought nearly 19 inches (480 mm) of rainfall to upstate South Carolina.[16]

Event Measurement Date Location County
Wettest tropical cyclone[10] 17.00 inches (432 mm) Tropical Storm Jerry
(1995)		 Antreville Abbeville

Thunderstorms and tornadoes

South Carolina averages around 64 days of thunderstorm activity per year. Most thunderstorms occur during the summer. South Carolina is vulnerable to tornadoes. Some notable tornadoes have struck South Carolina and the state averages around 14 tornadoes annually.[17] There have been no F-5 tornadoes on record but over a dozen F-4 tornadoes have occurred in many counties in South Carolina.

Monthly normals and extremes for select cities

Climate data for Greenville, South Carolina (Greenville–Spartanburg Int'l), 1991–2020 normals,[a] extremes 1884–present[b]
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Record high °F (°C) 82
(28) 		81
(27) 		91
(33) 		94
(34) 		100
(38) 		105
(41) 		107
(42) 		105
(41) 		101
(38) 		98
(37) 		86
(30) 		79
(26) 		107
(42)
Mean maximum °F (°C) 70.3
(21.3) 		73.2
(22.9) 		81.2
(27.3) 		85.8
(29.9) 		90.6
(32.6) 		95.1
(35.1) 		97.3
(36.3) 		95.9
(35.5) 		92.1
(33.4) 		85.1
(29.5) 		77.0
(25.0) 		70.6
(21.4) 		98.3
(36.8)
Mean daily maximum °F (°C) 52.8
(11.6) 		57.0
(13.9) 		64.4
(18.0) 		73.2
(22.9) 		80.3
(26.8) 		87.2
(30.7) 		90.3
(32.4) 		88.5
(31.4) 		82.7
(28.2) 		73.1
(22.8) 		62.9
(17.2) 		54.9
(12.7) 		72.3
(22.4)
Daily mean °F (°C) 42.5
(5.8) 		45.9
(7.7) 		52.8
(11.6) 		61.0
(16.1) 		68.9
(20.5) 		76.3
(24.6) 		79.7
(26.5) 		78.4
(25.8) 		72.5
(22.5) 		61.7
(16.5) 		51.6
(10.9) 		44.8
(7.1) 		61.3
(16.3)
Mean daily minimum °F (°C) 32.1
(0.1) 		34.8
(1.6) 		41.2
(5.1) 		48.7
(9.3) 		57.5
(14.2) 		65.5
(18.6) 		69.2
(20.7) 		68.3
(20.2) 		62.4
(16.9) 		50.4
(10.2) 		40.4
(4.7) 		34.8
(1.6) 		50.4
(10.2)
Mean minimum °F (°C) 15.7
(−9.1) 		20.3
(−6.5) 		24.8
(−4.0) 		33.5
(0.8) 		43.7
(6.5) 		56.3
(13.5) 		63.0
(17.2) 		61.6
(16.4) 		50.6
(10.3) 		35.1
(1.7) 		26.1
(−3.3) 		21.1
(−6.1) 		13.7
(−10.2)
Record low °F (°C) −6
(−21) 		−5
(−21) 		11
(−12) 		22
(−6) 		27
(−3) 		40
(4) 		53
(12) 		50
(10) 		32
(0) 		25
(−4) 		11
(−12) 		3
(−16) 		−6
(−21)
Average precipitation inches (mm) 4.12
(105) 		3.84
(98) 		4.48
(114) 		4.04
(103) 		4.07
(103) 		3.90
(99) 		4.82
(122) 		4.66
(118) 		3.73
(95) 		3.59
(91) 		3.84
(98) 		4.58
(116) 		49.67
(1,262)
Average snowfall inches (cm) 1.6
(4.1) 		1.0
(2.5) 		0.6
(1.5) 		0.0
(0.0) 		0.0
(0.0) 		0.0
(0.0) 		0.0
(0.0) 		0.0
(0.0) 		0.0
(0.0) 		0.0
(0.0) 		0.1
(0.25) 		0.6
(1.5) 		3.9
(9.9)
Average precipitation days (≥ 0.01 in) 10.4 9.4 10.2 9.7 9.7 10.8 12.0 11.1 8.0 7.1 8.5 10.0 116.9
Average snowy days (≥ 0.1 in) 1.1 0.7 0.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.4 2.6
Average relative humidity (%) 65.8 62.6 62.1 60.7 68.5 70.5 74.0 75.6 75.8 70.9 68.2 67.7 68.5
Mean monthly sunshine hours 176.6 182.7 236.2 264.7 269.2 270.8 267.8 253.9 229.2 235.2 184.3 169.4 2,740
Percent possible sunshine 56 60 64 68 62 62 61 61 62 67 59 55 62
Source: NOAA (relative humidity 1962–1990, sun 1961–1990)[18][19][20]
Climate data for Myrtle Beach (1981−2010 normals)
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Record high °F (°C) 83
(28) 		85
(29) 		94
(34) 		96
(36) 		101
(38) 		106
(41) 		104
(40) 		106
(41) 		102
(39) 		98
(37) 		89
(32) 		84
(29) 		106
(41)
Mean daily maximum °F (°C) 55.0
(12.8) 		58.4
(14.7) 		64.4
(18.0) 		72.2
(22.3) 		79.4
(26.3) 		85.0
(29.4) 		87.9
(31.1) 		87.1
(30.6) 		83.6
(28.7) 		75.9
(24.4) 		67.9
(19.9) 		58.6
(14.8) 		73.0
(22.8)
Daily mean °F (°C) 44.5
(6.9) 		47.4
(8.6) 		53.2
(11.8) 		61.0
(16.1) 		69.1
(20.6) 		76.2
(24.6) 		79.6
(26.4) 		78.4
(25.8) 		73.7
(23.2) 		64.2
(17.9) 		55.6
(13.1) 		47.3
(8.5) 		62.5
(16.9)
Mean daily minimum °F (°C) 34.0
(1.1) 		36.4
(2.4) 		42.1
(5.6) 		49.9
(9.9) 		58.9
(14.9) 		67.4
(19.7) 		71.3
(21.8) 		69.7
(20.9) 		63.8
(17.7) 		52.6
(11.4) 		43.4
(6.3) 		36.1
(2.3) 		52.1
(11.2)
Record low °F (°C) 4
(−16) 		11
(−12) 		12
(−11) 		22
(−6) 		35
(2) 		42
(6) 		51
(11) 		55
(13) 		45
(7) 		22
(−6) 		16
(−9) 		8
(−13) 		4
(−16)
Average precipitation inches (mm) 3.31
(84) 		3.43
(87) 		3.60
(91) 		2.51
(64) 		3.14
(80) 		4.38
(111) 		5.68
(144) 		6.19
(157) 		6.33
(161) 		3.91
(99) 		2.50
(64) 		3.27
(83) 		48.24
(1,225)
Average snowfall inches (cm) 0
(0) 		0.1
(0.25) 		0
(0) 		0
(0) 		0
(0) 		0
(0) 		0
(0) 		0
(0) 		0
(0) 		0
(0) 		0
(0) 		0.6
(1.5) 		0.8
(2.0)
Average precipitation days (≥ 0.01 in) 8.5 6.8 7.0 5.9 7.7 8.7 9.9 10.6 8.4 6.0 5.7 7.6 92.8
Average snowy days (≥ 0.1 in) 0 0 0 0 0 0 0 0 0 0 0 0.1 0.1
Source: [1]
Climate data for Charleston Int'l, South Carolina (1991–2020 normals,[21] extremes 1938–present)
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Record high °F (°C) 83
(28) 		87
(31) 		90
(32) 		95
(35) 		101
(38) 		103
(39) 		104
(40) 		105
(41) 		99
(37) 		94
(34) 		88
(31) 		83
(28) 		105
(41)
Mean maximum °F (°C) 76.7
(24.8) 		78.7
(25.9) 		84.2
(29.0) 		88.0
(31.1) 		93.0
(33.9) 		96.4
(35.8) 		97.7
(36.5) 		96.6
(35.9) 		92.9
(33.8) 		87.4
(30.8) 		82.2
(27.9) 		77.2
(25.1) 		98.9
(37.2)
Mean daily maximum °F (°C) 60.2
(15.7) 		63.8
(17.7) 		70.1
(21.2) 		77.1
(25.1) 		83.6
(28.7) 		88.5
(31.4) 		91.3
(32.9) 		89.8
(32.1) 		85.4
(29.7) 		77.9
(25.5) 		69.4
(20.8) 		62.7
(17.1) 		76.6
(24.8)
Daily mean °F (°C) 49.5
(9.7) 		52.7
(11.5) 		58.7
(14.8) 		65.8
(18.8) 		73.3
(22.9) 		79.4
(26.3) 		82.5
(28.1) 		81.4
(27.4) 		76.9
(24.9) 		67.8
(19.9) 		58.3
(14.6) 		52.2
(11.2) 		66.5
(19.2)
Mean daily minimum °F (°C) 38.9
(3.8) 		41.6
(5.3) 		47.3
(8.5) 		54.5
(12.5) 		63.0
(17.2) 		70.4
(21.3) 		73.7
(23.2) 		73.1
(22.8) 		68.3
(20.2) 		57.7
(14.3) 		47.1
(8.4) 		41.6
(5.3) 		56.4
(13.6)
Mean minimum °F (°C) 22.0
(−5.6) 		26.2
(−3.2) 		30.8
(−0.7) 		39.7
(4.3) 		50.2
(10.1) 		61.7
(16.5) 		68.2
(20.1) 		66.4
(19.1) 		57.0
(13.9) 		41.7
(5.4) 		31.7
(−0.2) 		26.0
(−3.3) 		20.3
(−6.5)
Record low °F (°C) 6
(−14) 		12
(−11) 		15
(−9) 		29
(−2) 		36
(2) 		50
(10) 		58
(14) 		56
(13) 		42
(6) 		27
(−3) 		15
(−9) 		8
(−13) 		6
(−14)
Average precipitation inches (mm) 3.37
(86) 		3.05
(77) 		3.35
(85) 		3.29
(84) 		3.32
(84) 		6.21
(158) 		6.60
(168) 		6.97
(177) 		6.01
(153) 		4.33
(110) 		2.66
(68) 		3.35
(85) 		52.51
(1,334)
Average snowfall inches (cm) 0.2
(0.51) 		0.1
(0.25) 		0.0
(0.0) 		0.0
(0.0) 		0.0
(0.0) 		0.0
(0.0) 		0.0
(0.0) 		0.0
(0.0) 		0.0
(0.0) 		0.0
(0.0) 		0.0
(0.0) 		0.0
(0.0) 		0.3
(0.76)
Average precipitation days (≥ 0.01 in) 8.9 8.5 8.2 7.9 8.1 12.1 13.2 13.1 10.2 7.3 6.9 9.3 113.7
Average snowy days (≥ 0.1 in) 0.1 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.2
Average relative humidity (%) 69.8 67.4 68.1 67.5 72.5 75.1 76.6 78.9 78.2 74.1 72.7 71.6 72.7
Average dew point °F (°C) 36.0
(2.2) 		37.4
(3.0) 		44.8
(7.1) 		51.3
(10.7) 		61.0
(16.1) 		67.8
(19.9) 		71.4
(21.9) 		71.4
(21.9) 		66.9
(19.4) 		55.9
(13.3) 		47.5
(8.6) 		39.9
(4.4) 		54.3
(12.4)
Mean monthly sunshine hours 179.3 186.7 243.9 275.1 294.8 279.5 287.8 256.7 219.7 224.5 189.5 171.3 2,808.8
Percent possible sunshine 56 61 66 71 69 65 66 62 59 64 60 55 63
Average ultraviolet index 2.4 3.6 5.4 7.3 8.5 9.3 9.5 8.6 6.9 4.7 2.9 2.2 5.9
Source 1: NOAA (relative humidity and sun 1961–1990)[22][23][24]
Source 2: UV Index Today (1995 to 2022)[25]
Climate data for Charleston, South Carolina (Downtown), 1991–2020 normals,[21] extremes 1893–present
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Record high °F (°C) 82
(28) 		83
(28) 		94
(34) 		94
(34) 		100
(38) 		104
(40) 		103
(39) 		103
(39) 		100
(38) 		95
(35) 		87
(31) 		81
(27) 		104
(40)
Mean maximum °F (°C) 72.4
(22.4) 		74.8
(23.8) 		80.0
(26.7) 		83.8
(28.8) 		90.1
(32.3) 		93.4
(34.1) 		95.3
(35.2) 		93.9
(34.4) 		90.8
(32.7) 		85.2
(29.6) 		79.2
(26.2) 		74.3
(23.5) 		96.8
(36.0)
Mean daily maximum °F (°C) 58.0
(14.4) 		60.3
(15.7) 		65.6
(18.7) 		72.3
(22.4) 		79.0
(26.1) 		84.3
(29.1) 		87.5
(30.8) 		86.4
(30.2) 		82.6
(28.1) 		75.6
(24.2) 		67.1
(19.5) 		60.9
(16.1) 		73.3
(22.9)
Daily mean °F (°C) 50.8
(10.4) 		53.2
(11.8) 		58.8
(14.9) 		66.0
(18.9) 		73.5
(23.1) 		79.2
(26.2) 		82.3
(27.9) 		81.4
(27.4) 		77.6
(25.3) 		69.4
(20.8) 		60.1
(15.6) 		53.8
(12.1) 		67.2
(19.6)
Mean daily minimum °F (°C) 43.6
(6.4) 		46.1
(7.8) 		52.0
(11.1) 		59.7
(15.4) 		68.0
(20.0) 		74.2
(23.4) 		77.1
(25.1) 		76.5
(24.7) 		72.5
(22.5) 		63.2
(17.3) 		53.1
(11.7) 		46.8
(8.2) 		61.1
(16.2)
Mean minimum °F (°C) 28.6
(−1.9) 		32.3
(0.2) 		37.2
(2.9) 		46.1
(7.8) 		56.3
(13.5) 		67.1
(19.5) 		71.7
(22.1) 		70.8
(21.6) 		63.4
(17.4) 		48.6
(9.2) 		38.9
(3.8) 		33.1
(0.6) 		26.9
(−2.8)
Record low °F (°C) 10
(−12) 		7
(−14) 		22
(−6) 		36
(2) 		45
(7) 		52
(11) 		61
(16) 		59
(15) 		50
(10) 		37
(3) 		17
(−8) 		12
(−11) 		7
(−14)
Average precipitation inches (mm) 2.56
(65) 		2.56
(65) 		3.03
(77) 		2.96
(75) 		2.58
(66) 		4.85
(123) 		5.08
(129) 		6.11
(155) 		5.25
(133) 		4.07
(103) 		2.30
(58) 		2.91
(74) 		44.26
(1,124)
Average precipitation days (≥ 0.01 in) 8.4 8.0 7.9 7.0 6.8 10.5 11.6 11.7 8.6 6.8 6.1 8.5 101.9
Source: NOAA[22][26][27]

Statewide climate data

Climate data for South Carolina
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Record high °F (°C) 88
(31) 		89
(32) 		99
(37) 		99
(37) 		106
(41) 		113
(45) 		110
(43) 		110
(43) 		111
(44) 		103
(39) 		93
(34) 		89
(32) 		113
(45)
Record low °F (°C) −19
(−28) 		−11
(−24) 		−8
(−22) 		17
(−8) 		28
(−2) 		37
(3) 		45
(7) 		45
(7) 		28
(−2) 		16
(−9) 		−1
(−18) 		−6
(−21) 		−19
(−28)
Source: "South Carolina Monthly Temperature Extremes".

See also

Notes

  1. ^ Mean monthly maxima and minima (i.e. the expected highest and lowest temperature readings at any point during the year or given month) calculated based on data at said location from 1991 to 2020.
  2. ^ Official records for Greenville kept April 1884 to 10 December 1941 at downtown, 11 December 1941 to 14 October 1962 at Greenville Downtown Airport, and at Greenville–Spartanburg Int'l near Greer since 15 October 1962. For more information, see Threadex

References

  1. ^ "South Carolina Record Maximum Temperatures and Date". South Carolina State Climatology Office. South Carolina Department of Natural Resources. Retrieved 4 February 2010.
  2. ^ "Map of South Carolina Record Maximum Temperatures and Year". South Carolina State Climatology Office. South Carolina Department of Natural Resources. Retrieved 4 February 2010.
  3. ^ "South Carolina Record Minimum Temperatures and Date". South Carolina State Climatology Office. South Carolina Department of Natural Resources. Retrieved 4 February 2010.
  4. ^ "Map of South Carolina Record Minimum Temperatures and Year". South Carolina State Climatology Office. South Carolina Department of Natural Resources. Retrieved 4 February 2010.
  5. ^ South Carolina State Climatology Office. South Carolina Climate. Retrieved on 2008-03-18.
  6. ^ National Atlas.gov. Average annual precipitation for South Carolina. Archived 2008-08-16 at the Wayback Machine Retrieved on 2008-03-08.
  7. ^ "New Record Annual Rainfall Total Set in South Carolina". Retrieved 4 May 2019.
  8. ^ "South Carolina Maximum 24-Hour Precipitation". South Carolina State Climatology Office. South Carolina Department of Natural Resources. Retrieved 5 May 2019.
  9. ^ "South Carolina County 24-Hour Precipitation Records". South Carolina State Climatology Office. South Carolina Department of Natural Resources. Retrieved 5 May 2019.
  10. ^ a b "September 16, 1999". South Carolina State Climatology Office. South Carolina Department of Natural Resources. Retrieved 5 May 2019.
  11. ^ "South Carolina Maximum 24-Hour Snow". South Carolina State Climatology Office. South Carolina Department of Natural Resources. Retrieved 4 February 2010.
  12. ^ "South Carolina Historical Maximum Snowfall events". South Carolina State Climatology Office. South Carolina Department of Natural Resources. Retrieved 7 November 2011.
  13. ^ National Hurricane Center. Graphic showing seasonal activity by date. Retrieved on 2008-03-18.
  14. ^ Eric S. Blake, Edward N. Rappaport, and Chris Landsea. The Deadliest, Costliest, and Most Intense United States Tropical Cyclones From 1851 to 2006 (and other frequently requested hurricane facts).
  15. ^ National Hurricane Center. Atlantic Hurricane Track Database. Retrieved on 2008-03-18.
  16. ^ David M. Roth. Tropical Storm Jerry Color-Filled Rainfall Graphic. Retrieved on 2008-03-18.
  17. ^ National Climatic Data Center. Annual average number of tornadoes. Retrieved on 2006-10-24.
  18. ^ "NowData: NOAA Online Weather Data". National Oceanic and Atmospheric Administration. Retrieved May 14, 2021.
  19. ^ "Station: Greer, SC". U.S. Climate Normals 2020: U.S. Monthly Climate Normals (1991–2020). National Oceanic and Atmospheric Administration. Retrieved May 14, 2021.
  20. ^ "WMO Climate Normals for GREENVILLE/G-SPARTANBURG, SC 1961–1990". National Oceanic and Atmospheric Administration. Retrieved September 4, 2016.
  21. ^ a b Mean monthly maxima and minima (i.e. the expected highest and lowest temperature readings at any point during the year or given month) calculated based on data at said location from 1991 to 2020.
  22. ^ a b "NowData – NOAA Online Weather Data". National Oceanic and Atmospheric Administration. Retrieved May 5, 2021.
  23. ^ "Summary of Monthly Normals 1991–2020". National Oceanic and Atmospheric Administration. Retrieved May 5, 2021.
  24. ^ "WMO Climate Normals for CHARLESTON/MUNICIPAL, SC 1961–1990". National Oceanic and Atmospheric Administration. Retrieved May 5, 2021.
  25. ^ "Historical UV Index Data - Charleston, SC". UV Index Today. Retrieved April 23, 2023.
  26. ^ "Summary of Monthly Normals 1991–2020". National Oceanic and Atmospheric Administration. Retrieved May 5, 2021.
  27. ^ "SC ACIS". Applied Climate Information System. Retrieved May 29, 2021.
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