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

                                      WDC for Geomagnetism, Kyoto
                                Hourly Equatorial Dst Values (FINAL)      
                                              APRIL   2009
      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    1   1   0   3   4   5   5   5    4   4   1   2   7   9   9   9    8   8   8   9  10   8   7   4
 2    1   2   3   3   2   1   0  -1    0   1   1   1   0  -2  -3  -2   -3  -4  -4  -5  -3   0   2   3
 3    2   3   4   6   7   6   6   6    6   7   3  -1   0   1   2  -2   -5  -6  -5  -2   0   1  -1  -2
 4   -4  -6  -5  -3   1   2   5   6    5   6   6   7   7   8   8   7    6   7  10  12  13  12  10   7
 5    4   5   3   6  12  11   4   5    4   3   8   8   8   8   5   3    3   3   0   2   3   2  -1  -4

 6   -4  -6  -7  -7  -4  -1   1   3    4   6   7   6   5   5   3   3    3   6   9   7   5   4   2   4
 7    4   2   1   1   1   2   4   5    5   5   6   5   6   5   6   7    5   5   3  -1  -4  -5  -7  -4
 8   -1   0  -1   0   1   2   3   4    4   8   9   8   8  13  15  15   20  22  20   8   3  -1   3   7
 9   11   9   0  -7 -14 -12  -8  -4   -4  -9 -15 -13  -9  -7  -5 -11  -20 -23 -23 -26 -27 -25 -19 -16
10  -15 -15 -13 -11  -8  -5  -5  -6  -10 -11 -11 -11  -8 -10 -12 -11   -9 -11 -13  -7  -1   0  -1  -8

11  -13 -11  -9 -11  -7  -6 -10 -11  -11  -9  -6  -4  -3  -3  -8  -8  -11 -10  -8 -10 -10 -10 -13 -13
12  -11 -11 -12 -12 -11  -7  -9 -11  -11  -9  -8  -7  -7  -6  -4  -3   -3  -7 -14 -14 -12 -13 -13 -15
13  -18 -20 -19 -14 -11  -8 -10  -8   -7  -8  -9  -9  -9  -8  -3  -3  -10 -11 -13 -12 -13 -12 -12 -11
14  -10  -7  -6  -5  -3  -1  -1  -2   -5  -7  -8  -7  -5  -3  -3  -5   -6  -6  -6  -5  -4  -4  -5  -4
15   -3  -4  -4  -3  -2  -2  -2  -2   -4  -6  -6  -3  -3  -3  -1  -1   -3  -3  -4  -5  -4  -6  -8  -6

16   -6  -6  -8  -8  -5  -3  -7 -11   -9  -6  -6  -4  -1  -1   2   8   10  -2   1   1  -1  -3  -2  -8
17   -6  -5  -2   0   1   4   6   2    1   0  -2  -4  -6  -5  -3  -4   -4  -1   0  -1  -3  -1  -4   3
18    3   3   0  -1  -6 -15 -25 -21  -17 -15 -11 -11 -10  -7  -5  -4   -3  -4  -5  -5  -6  -9 -12  -7
19   -8 -10  -9  -8  -8  -8  -7  -7   -7  -6  -5  -2   0   1   3   4    7   5   4   1  -1  -2  -4  -3
20   -4  -4  -2   0   0  -2  -1   0    1  -1  -2  -5  -6  -6  -5  -5   -4  -4  -5  -6  -3  -3  -2  -2

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

26   -3  -2  -3   0   2   0   1  -1   -2  -2  -1   1   0   0   0   1    5   9  10  10   7   5   4   0
27   -8 -12 -12 -10 -10 -10 -11 -10  -10  -9  -9  -7  -7  -6  -5  -1    2   4   3   3   2   2   3   3
28    3   4   5   4   3   1   1   2    4   5   4   1   1   1   2   5    5   5   4   5   6   6   7   7
29    8   6   7   7   8   9  11  10    8   2  -3  -6  -4  -2  -1  -1   -2  -1   0   3   3   4   4   2
30   -3  -3  -3  -1  -2  -2  -1  -1   -1   0  -1  -2  -1   0  -1  -1    0  -3  -5  -6  -4  -2   0   1