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

                                      WDC for Geomagnetism, Kyoto
                                Hourly Equatorial Dst Values (FINAL)      
                                                MAY   2011
      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  -28 -30 -31 -31 -30 -29 -29 -28  -24 -20 -22 -20 -25 -33 -30 -30  -33 -32 -32 -32 -31 -30 -28 -22
 2  -24 -30 -35 -39 -40 -42 -47 -43  -43 -43 -40 -31 -33 -31 -30 -30  -29 -27 -32 -34 -34 -34 -30 -28
 3  -32 -35 -33 -36 -36 -32 -29 -25  -23 -23 -19 -16 -17 -18 -18 -21  -18 -19 -24 -29 -27 -24 -21 -19
 4  -19 -19 -20 -20 -19 -16 -13 -15  -16 -20 -18 -14 -14 -14 -14 -17  -19 -20 -22 -20 -21 -20 -21 -21
 5  -20 -19 -20 -18 -16 -19 -19 -21  -19 -17 -14 -13 -12 -13 -11 -13  -14 -15 -19 -21 -23 -24 -19 -16

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

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

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

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

26   -8  -7  -2   0  -2  -5  -5  -1    5   7   7   6   9  18  20  11   -3  -9 -11 -12 -15 -18 -15 -12
27  -13 -12 -10  -8  -5  -7  -8  -2    2   1   1   1  -1  -5  -2  -1   -4 -15 -20 -26 -27 -32 -34 -33
28  -31 -32 -33 -31 -27 -25 -21 -32  -41 -47 -74 -80 -71 -75 -80 -77  -74 -69 -64 -59 -54 -45 -54 -56
29  -52 -45 -36 -31 -35 -48 -54 -52  -46 -38 -45 -52 -48 -44 -42 -39  -43 -44 -44 -45 -43 -46 -47 -44
30  -44 -39 -35 -36 -38 -36 -30 -28  -24 -22 -22 -26 -30 -28 -25 -24  -25 -28 -32 -33 -30 -32 -27 -23

31  -24 -23 -24 -27 -29 -28 -31 -28  -23 -24 -20 -19 -19 -19 -19 -17  -22 -22 -22 -27 -28 -31 -33 -31