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(The monthly data in the wdc-like format is here.)

                                      WDC for Geomagnetism, Kyoto
                                Hourly Equatorial Dst Values (FINAL)      
                                                MAY   2010
      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   -6  -7  -8  -9 -11 -12 -11 -10   -9  -8  -3  -3  -3  -2  -1  -3   -4  -3  -2  -1  -2  -2  -2  -4
 2   -4  -2   0   5   8   5  16  23   29  26  25   9 -20 -43 -58 -53  -61 -69 -71 -68 -70 -62 -60 -59
 3  -53 -58 -52 -51 -47 -50 -48 -45  -44 -39 -36 -48 -46 -47 -47 -44  -45 -42 -44 -35 -35 -38 -36 -36
 4  -34 -35 -36 -34 -33 -30 -31 -33  -35 -37 -34 -35 -36 -36 -35 -33  -31 -33 -29 -27 -26 -27 -29 -30
 5  -26 -25 -23 -23 -25 -25 -22 -22  -25 -26 -24 -24 -22 -23 -23 -25  -25 -24 -20 -18 -19 -19 -18 -17

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

11    0   2   3   1   3   0  -9 -13  -11 -11  -5  -3  -2   0  -4  -8  -10  -9  -8  -7  -4  -1   3   3
12    2  -2  -5  -3  -2   0  -1   0   -2   0  -5  -9 -11 -13 -13 -10  -10 -10 -13 -14 -14 -13 -14 -13
13  -15 -13 -11 -11 -10  -9 -10 -10   -8  -7  -4  -4  -3  -1  -3  -5   -3  -6  -5  -7  -6  -6  -7  -5
14   -3  -1   0  -1  -3  -3  -4  -5   -3  -2  -2  -1  -2  -5  -6  -4   -4  -5  -2   1   1   0   0  -1
15   -1  -2  -5  -9 -11 -12 -11 -13  -13 -12 -12 -11 -12 -12 -11  -9   -7  -6  -5  -6  -7  -7  -8  -8

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

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

26    2   6  10  11   8   6   3   2    0  -6  -9  -7  -3   0  -2  -2   -4  -5  -2   0  -1  -4  -8 -10
27  -11  -7  -6  -6  -6  -6  -5  -6   -6  -5  -5  -4  -4  -5  -4  -3   -1  -2  -3  -3  -2  -2  -4  -7
28   -7  -6  -5   9   8   7   6   7   14  18  12   6   4   0   8  13   17  17  17  11  14   3  -9 -12
29  -12 -14 -17 -21 -29 -42 -53 -62  -57 -69 -72 -76 -80 -79 -77 -73  -70 -60 -52 -52 -49 -38 -31 -34
30  -35 -34 -34 -35 -35 -36 -42 -45  -43 -38 -35 -31 -26 -27 -22 -24  -31 -41 -47 -53 -58 -57 -55 -45

31  -44 -41 -38 -36 -33 -37 -36 -36  -39 -33 -26 -22 -26 -35 -39 -36  -33 -32 -33 -37 -42 -45 -41 -42