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(The data for this month in the wdc-like format is here.)

                                      WDC for Geomagnetism, Kyoto
                                Hourly Equatorial Dst Values (FINAL)      
                                           DECEMBER   2017
      unit=nT                                                                                      UT
      1   2   3   4   5   6   7   8    9  10  11  12  13  14  15  16   17  18  19  20  21  22  23  24
DAY
 1   -4  -4  -6  -6 -11 -12  -8  -4   -4  -8  -9 -12  -9  -7  -8  -6   -6  -7  -9  -5  -3   0  -2  -4
 2   -5  -7  -7  -5  -4  -1   0   1    3   4   1   0   2   0  -3  -8   -5  -4  -3  -2  -2  -3  -4  -4
 3   -4  -6 -12 -14 -16 -16 -15 -11   -6  -5  -8  -9  -8  -4  -2  -3   -2  -1   0   0  -1   0  -2  -1
 4    2   1   2   4   6   8   6   0   -1  -2  -1  -2  -5  -4   3   5   12  -5 -25 -39 -41 -40 -32 -25
 5  -24 -25 -30 -33 -31 -26 -24 -32  -37 -43 -51 -47 -37 -26 -22 -25  -28 -23 -19 -22 -21 -22 -29 -31

 6  -29 -26 -27 -23 -21 -28 -30 -32  -30 -30 -34 -33 -31 -25 -20 -20  -23 -24 -25 -23 -22 -20 -18 -20
 7  -21 -16 -14 -13 -12 -17 -18 -18  -14 -13 -14 -12 -14 -14 -15 -23  -18 -18 -17 -19 -20 -20 -21 -22
 8  -21 -20 -17 -15 -15 -19 -18 -15  -14 -14 -12 -10  -8  -8  -9  -8   -9  -9  -7  -8  -7  -8  -8  -9
 9  -11 -14 -14 -14 -14 -11  -7  -6   -4  -4  -7  -9  -8  -8  -6  -6   -6  -5  -4  -4  -4  -4  -4  -2
10    0   0   1   0   1   1   1   0    1   0   2   3   3   1  -2  -5   -9 -10 -11 -12 -11  -7  -7  -9

11   -9  -9  -6  -3   7   9  10   5   -2  -7 -14 -16 -12 -15  -9 -13   -8  -5  -6  -5   5   7   6   4
12   -3  -6  -8  -8 -13 -18 -22 -21  -17 -16 -15 -12  -9  -8  -3  -2   -3  -5 -19 -23 -17 -18 -17 -16
13  -14 -10  -8  -9  -8  -7  -7 -10  -12 -10  -9  -9 -11 -14 -13 -13  -13  -9 -10 -10  -8 -10 -10  -7
14   -3  -4  -8  -7  -6  -7  -8  -8   -6  -7  -8 -10  -5  -2  -1  -3   -4  -4  -2  -2   0   1   2   0
15    3   3   3   2   1  -1   0   1    1   0  -2   0   2   0   4   3    3   3   5   6   4   3   6   3

16    4   7   6   5   2   3   5   9   10   7   3  -4  -6  -4  -3  -3   -4  -2   0   0   3   9  19  22
17   21  24  16  10  14   7 -18 -12   -5  -9 -10 -15 -23 -14  -7 -17  -20 -17 -19  -9 -17 -18 -17 -17
18  -19 -15 -17 -13 -16 -18 -19 -28  -23 -27 -25 -27 -22 -16 -17 -17  -16 -13 -14 -14 -14 -11 -10  -9
19   -7  -3  -2  -3  -2  -3  -6  -8   -9 -10  -9 -11 -10 -10 -10  -7   -6  -6  -8 -11 -13 -17 -23 -20
20  -17 -15 -15 -16 -15 -13  -8  -7   -8 -12 -13  -6  -6  -4  -2  -4   -6  -4  -5  -4  -2  -1  -4  -5

21   -5  -6  -6  -5  -3  -4  -6  -7   -9  -7  -6  -5  -6  -7  -4  -4   -4  -3  -3  -4  -3  -4  -5  -5
22   -5  -5  -4  -3  -3  -3   0   2    5   6   4   3   1   1   1   2    2   3   3   4   5   6   4   5
23    6   8   8   9   7   6   7   6    0  -3  -4  -6 -12  -7  -2  -1   -1   0   1   3   7   8   8   9
24   12  12  13  17  22  24  26  21   13  12   8 -14 -25 -15 -12  -7   -6  -6  -6  -7 -10 -15 -14 -12
25   -3  -1  -4  -7  -7  -8  -9  -9  -10  -7  -4  -6  -4  -3  -5  -6  -12 -18 -22 -18 -18 -21 -24 -26

26  -24 -20 -17 -15 -15 -16 -16 -13  -13 -11 -11  -9  -6  -7  -9  -4   -1  -2  -1  -6  -7 -10 -10 -10
27   -8  -8  -6  -8 -10 -10  -4   0    5  -2  -7  -8  -9 -10  -5  -2    0   2  -2  -6  -8  -6  -7  -4
28   -1  -1  -5  -4  -4  -4  -5  -4   -5  -7  -7  -9  -5  -4  -2  -6   -6  -6  -6  -8 -10  -8 -11  -7
29   -1   0  -2  -3  -3  -5  -5  -6   -4  -2   1   3   2  -1  -3   0    2   1  -1   0   4   5   6   8
30   10   7   4   3   6   6   8   7    8   6   5   3  -1  -1   1  -3   -6  -6  -5  -6  -6  -3   0   2

31    6   7   6   4   2   1   4   6    8   7   9  10   9   8   7   7    5   5  11  15  12   7   2   1