Template:Charleston, South Carolina weatherbox
| Climate data for Charleston Int'l, South Carolina (1991–2020 normals,[1] 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)[2][3][4] | |||||||||||||
| Source 2: UV Index Today (1995 to 2022)[5] | |||||||||||||
| Climate data for Charleston, South Carolina (Downtown), 1991–2020 normals,[1] 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[2][6][7] | |||||||||||||
- ^ 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.
- ^ a b "NowData – NOAA Online Weather Data". National Oceanic and Atmospheric Administration. Retrieved May 5, 2021.
- ^ "Summary of Monthly Normals 1991–2020". National Oceanic and Atmospheric Administration. Retrieved May 5, 2021.
- ^ "WMO Climate Normals for CHARLESTON/MUNICIPAL, SC 1961–1990". National Oceanic and Atmospheric Administration. Retrieved May 5, 2021.
- ^ "Historical UV Index Data - Charleston, SC". UV Index Today. Retrieved April 23, 2023.
- ^ "Summary of Monthly Normals 1991–2020". National Oceanic and Atmospheric Administration. Retrieved May 5, 2021.
- ^ "SC ACIS". Applied Climate Information System. Retrieved May 29, 2021.