National Weather Service United States Department of Commerce
April Daily/Monthly Normals for Charleston
(see notes below table)
Date Normal High Normal Low Average Record High RH Year Record Low RL Year HDD CDD Precip
Snow
1
63
40
52
91
1974
18
1923
14
0
.11
0.1
2
63
41
52
91
2010
20
1923
14
1
.10
0.1
3
63
41
52
89
1934*
22
1965
13
1
.11
0.1
4
64
41
53
91
1934
21
1943
13
1
.10
0.1
5
64
42
53
89
1947
23
1903
13
1
.10
0.1
6
65
42
53
92
1929
23
1975
12
1
.10
0.1
7
65
42
54
93
1929
19
1982
12
1
.11
0.1
8
65
43
54
93
1929
23
1972
12
1
.10
0
9
66
43
54
90
1919
19
1972
11
1
.11
0.1
10
66
43
55
89
1933*
21
1997
11
1
.11
0.1
11
67
43
55
92
1930
22
1989
11
1
.10
0
12
67
44
55
94
1930
23
1976
11
1
.10
0.1
13
67
44
56
90
1903
25
1990*
10
1
.10
0.1
14
68
44
56
88
1931
20
1950
10
1
.11
0
15
68
45
56
89
1994
25
1957
10
1
.10
0.1
16
68
45
56
89
2002*
25
1950
9
1
.10
0
17
69
45
57
89
1976
26
1980
9
1
.10
0.1
18
69
45
57
90
1976
26
1983
9
1
.10
0
19
69
46
57
91
1941
26
1983
9
1
.11
0.1
20
69
46
58
91
1976
24
1926
9
1
.11
0
21
70
46
58
92
1985
24
1926
8
1
.11
0
22
70
46
58
92
1985
32
1942
8
1
.11
0
23
70
47
58
90
2001*
29
1986*
8
1
.11
0
24
70
47
59
96
1925
29
1986*
8
1
.12
0
25
71
47
59
94
1915
28
1927
7
1
.12
0
26
71
47
59
95
1915
29
1927
7
1
.12
0
27
71
48
59
94
1990
30
1926
7
1
.12
0
28
71
48
60
90
1915
29
1976
7
1
.12
0
29
72
48
60
90
1996*
29
1976
6
1
.12
0
30
72
48
60
94
1942
31
1977
6
1
.11
0
Totals
67.7
44.5
56.1
96
1925
18
1923
294
27
3.24
1.4

NOTES:

  • Temperatures are degrees F, precipitation is inches of liquid. All normals are based on the period 1981-2010.
  • RH Year=Year of record high, RH Low=Year of record low. Temperature records for Charleston began in 1901.
  • HDD=Heating degree days, CDD=Cooling degree days
  • An asterisk (*) after the year of occurrence of record highs and lows indicates the record was reached more than once, with the indicated year being the most recent.
  • Daily normal precipitation/snowfall values are more appropriate for calculating normals over a period of at least several days, rather than on a strict day-to-day basis.
  • Averages/totals may differ slightly from expected due to rounding.

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