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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)      
                                                MAY   2018
      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  -10  -9  -8 -10  -7  -3   0   0    2   4   2   0   0   0   2   1    2   2   2   1  -1  -1   2   2
 2    2   1   1  -1  -3  -4  -1   1   -1  -7 -11 -10  -9  -4  -1  -2   -4  -5  -6  -4  -2  -2  -3  -3
 3   -3  -3  -4  -5  -4  -2  -1   1    0  -2  -4  -5  -6  -1   0  -2    0   1   4   4   4   3  -2   0
 4   -1  -5  -3  -2  -1   0   3   3    0   2   1   0   2   2   5   5    9   8   5   2  -2  -1   2   1
 5    0  -1  -4  -5  -3  -2   1   3    4   5  17  28  23  19  17  -4  -12 -31 -41 -34 -25 -20 -26 -36

 6  -47 -53 -53 -54 -55 -47 -44 -42  -33 -33 -34 -35 -31 -22 -20 -23  -25 -24 -25 -23 -22 -22 -25 -22
 7  -24 -27 -31 -34 -41 -42 -38 -26  -21 -23 -24 -28 -19 -18 -22 -25  -25 -26 -28 -26 -24 -25 -22 -23
 8  -23 -21 -22 -16 -11 -29 -37 -28  -22 -24 -23 -22 -17 -13 -10 -19  -22 -23 -24 -27 -23 -23 -19 -17
 9  -18 -27 -32 -30 -27 -23 -23 -21  -17 -17 -17 -17 -21 -18 -17 -16  -18 -17 -23 -25 -18 -18 -21 -27
10  -27 -28 -26 -26 -20 -21 -21 -23  -31 -33 -32 -33 -33 -32 -30 -27  -29 -30 -31 -30 -30 -29 -30 -29

11  -26 -20 -17 -16 -22 -26 -29 -36  -34 -33 -29 -24 -21 -18 -20 -25  -27 -29 -34 -36 -40 -38 -31 -26
12  -25 -25 -23 -28 -29 -22 -18 -16  -16 -19 -18 -15 -15 -14 -16 -16  -16 -18 -16 -17 -20 -22 -21 -18
13  -16 -15 -13 -11 -11 -12  -7  -8  -18 -14 -19 -20 -20 -21 -19  -3   -4  -3  -2  -4 -10 -15 -12 -10
14   -9  -9 -11 -12 -13 -13 -10  -9  -13 -15 -13 -12 -12 -10 -10 -10  -10 -12 -15 -17 -16 -15 -13 -13
15   -8  -4  -2  -3  -4  -4  -5  -5  -11 -10 -12 -12 -10  -7  -8  -9  -11 -15 -16 -18 -17 -17 -16 -10

16   -4  -3  -4  -3  -3  -1  -2  -3   -4  -2   0   3   4   4   6   6    3  -2  -7  -9  -4  -1  -1   1
17   -1   1  -5  -9  -6  -2   2   5    6   8  -3  -9 -16 -15 -15 -20  -24 -27 -31 -33 -32 -29 -24 -21
18  -17 -20 -20 -13 -18 -16 -18 -19  -17 -14  -9  -7  -8  -8 -10  -9  -10 -14 -15 -17 -20 -19 -15 -11
19  -10 -10 -10 -11  -9  -9  -9  -9   -8  -9  -7  -5  -3  -3  -4  -5   -5  -6  -6  -9 -10 -10  -7  -5
20   -4  -4  -4  -3  -2  -3  -2  -6   -6  -8  -8  -8  -8  -9  -9  -8   -8  -9  -9  -8  -7  -6  -6  -5

21   -6  -8  -5  -3  -2  -6  -7  -7   -7  -7  -4  -3  -4  -5  -6  -5   -6  -7  -6  -4  -1   1  -1   2
22    2   1   3   4   1  -2  -5  -5   -1   2   1   0   9  13  13  13   12  10  14   8   8   8   6   1
23    2   4   5   4   1  -7 -14 -15   -8  -2  -4 -11 -11  -4  -2  -4   -4  -6  -7  -7  -7  -8  -7  -6
24   -8  -7  -4   1  -2  -1  -1  -1   -2  -5  -6  -5  -3  -5  -4  -3   -1  -3  -7  -9  -7  -2  -3  -2
25   -1  -4  -3  -4  -4  -3  -2  -2   -1  -1   0  -2  -4  -3  -4  -2   -1  -2  -2  -4  -4  -4  -3  -2

26   -2   3   2   3   3   5   3   1    2   4   4   6   6   4   6   6    6   8  12  12  11  11   7   3
27    4  12  18  18  13  13   8   6    3   0  -1  -2  -4  -1   0   3    3   5   5   2   3   1   4  10
28   14  15  14  10   8   8   6   3    3   5   8   8   4   3   4   4    6   5   3   4   5   9  10  11
29   14  17  19  17   8  10  10   5    6   5  10   9   7   3   3   4    2  -2  -4  -7  -7  -7  -6  -3
30    1   1   3   4   4   1  -2  -2   -1   4   5   8   6   2   5   7   10  12   9  10  10   9   2   3

31    1   6   8   7   7   7   7   6    6   9  13  16  16  13  16  29   28  19   9  -7   0   3  -7 -12