National Weather Service United States Department of Commerce
September 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
1
83
62
72
104
1932
47
1946
0
7
.11
2
82
62
72
104
1932
44
1949
0
7
.11
3
82
61
72
101
1953
45
1967
0
7
.12
4
82
61
71
100
1925
44
1997
0
7
.11
5
81
61
71
99
1925
41
1902
0
6
.12
6
81
61
71
98
1930
45
1950
0
6
.11
7
81
60
71
101
1929
45
1988
0
6
.10
8
81
60
70
97
1929
45
1951
1
6
.11
9
80
60
70
96
1964
43
1986*
1
5
.11
10
80
59
70
100
1925
42
1956*
1
5
.11
11
80
59
69
99
1931
41
1917*
1
5
.11
12
79
58
69
101
1931
42
1943
1
5
.11
13
79
58
69
102
1931
42
1917
1
4
.11
14
79
58
68
98
1931
38
1985*
1
4
.12
15
78
57
68
98
1928
40
1985*
1
4
.11
16
78
57
67
99
1931
41
2007*
2
4
.10
17
77
57
67
100
1931
39
2000
2
4
.12
18
77
56
67
95
1925
35
1937
2
4
.11
19
77
56
66
97
1925
36
1937
2
3
.10
20
76
55
66
96
1931
36
1937
2
3
.11
21
76
55
65
100
1931
34
1956
3
3
.11
22
76
55
65
102
1931
39
1999*
3
3
.11
23
75
54
65
98
1930
35
1947
3
3
.10
24
75
54
64
96
1930
34
1983*
3
2
.11
25
74
53
64
93
2007
35
1967
3
2
.10
26
74
53
63
93
1908
33
1928
4
2
.10
27
74
52
63
93
1929
35
1947
4
2
.11
28
73
52
63
98
1929
33
1942
4
2
.10
29
73
52
62
97
1929
32
1942
5
2
.10
30
73
51
62
94
1953
34
1947
5
2
.10
Totals
77.8
56.9
67.3
104
1932
32
1942
56
127
3.25

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 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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