National Weather Service United States Department of Commerce
December 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
50
33
42
74
2006
4
1929
24
0
.11
0.1
2
50
32
41
78
1982
10
1929
24
0
.11
0.1
3
49
32
41
80
1982
10
1966
24
0
.12
0.2
4
49
32
41
76
1982
9
1966
25
0
.11
0.1
5
49
32
40
77
2001
13
1974
25
0
.11
0.2
6
48
31
40
75
1998
10
1977
25
0
.11
0.1
7
48
31
40
77
1951
4
1977
26
0
.11
0.2
8
48
31
39
74
1916
6
1977
26
0
.11
0.2
9
47
31
39
76
1966
1
1917
26
0
.11
0.1
10
47
30
39
80
1971
0
1917
26
0
.11
0.2
11
47
30
38
75
1931
-2
1917
27
0
.12
0.2
12
46
30
38
72
1929
0
1962
27
0
.11
0.2
13
46
30
38
74
1927
0
1962
27
0
.11
0.2
14
46
29
38
72
1918
7
1942*
27
0
.11
0.3
15
45
29
37
79
1971
0
1914
28
0
.10
0.2
16
45
29
37
70
1940
0
1914
28
0
.11
0.2
17
45
29
37
78
1933
-2
1989
28
0
.10
0.2
18
45
29
37
77
1924
2
1989
28
0
.10
0.2
19
44
28
36
68
1924
5
1916
29
0
.10
0.2
20
44
28
36
67
1949
-2
1942
29
0
.10
0.2
21
44
28
36
74
1990
-7
1942
29
0
.10
0.3
22
44
28
36
70
1923
-10
1989
29
0
.10
0.2
23
44
28
36
73
1932
-12
1989
29
0
.11
0.3
24
44
28
36
73
1964
-6
1983
30
0
.11
0.3
25
43
27
35
76
1982
-10
1983
30
0
.10
0.2
26
43
27
35
72
1932
1
1983
30
0
.10
0.3
27
43
27
35
73
2008
2
1925
30
0
.10
0.3
28
43
27
35
73
1984*
2
1925
30
0
.10
0.3
29
43
27
35
75
1984
4
1925
30
0
.10
0.3
30
43
27
35
77
1932
-17
1917
30
0
.09
0.3
31
43
27
35
79
1951
-7
1917
30
0
.10
0.3
Totals
45.6
29.2
37.4
80
1982*
-17
1917
856
1
3.27
6.7

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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