| Tahun Data | : | 1999 |
| Nama Stasiun | : | TRMM-0975 |
| Lokasi Stasiun | : | Desa Simatalu, Kecamatan Siberut Barat, Kepulauan Mentawai, Provinsi Sumatera Barat |
| Longitude | : | 98.875000 |
| Latitude | : | -1.375000 |
| Tanggal | Jan | Feb | Mar | Apr | Mei | Jun | Jul | Agu | Sep | Okt | Nov | Des |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 9.729 | 12.553 | 24.313 | 0.000 | 91.014 | 0.000 | 3.279 | 0.000 | 0.000 | 37.456 | 1.027 | 13.762 |
| 2 | 29.460 | 4.648 | 10.031 | 0.000 | 8.242 | 0.060 | 1.895 | 0.000 | 12.392 | 53.876 | 0.187 | 8.301 |
| 3 | 4.049 | 26.371 | 22.203 | 0.000 | 49.922 | 0.000 | 21.177 | 7.785 | 32.602 | 0.000 | 0.000 | 1.435 |
| 4 | 4.291 | 6.672 | 0.000 | 0.000 | 34.734 | 10.578 | 15.431 | 9.747 | 7.666 | 16.634 | 11.111 | 1.560 |
| 5 | 0.000 | 1.012 | 17.829 | 31.850 | 8.654 | 14.804 | 0.271 | 11.074 | 0.000 | 19.538 | 8.403 | 32.017 |
| 6 | 0.000 | 0.000 | 5.168 | 12.555 | 1.648 | 0.000 | 20.244 | 0.573 | 0.000 | 10.946 | 17.305 | 17.694 |
| 7 | 0.000 | 0.727 | 1.988 | 33.132 | 29.612 | 0.240 | 9.836 | 5.945 | 0.000 | 0.000 | 33.302 | 0.687 |
| 8 | 0.574 | 2.561 | 1.835 | 2.505 | 10.685 | 27.180 | 13.025 | 0.000 | 6.181 | 41.859 | 1.650 | 0.312 |
| 9 | 1.481 | 4.079 | 9.939 | 1.193 | 8.860 | 11.178 | 13.205 | 12.643 | 11.877 | 1.437 | 0.000 | 3.058 |
| 10 | 0.000 | 0.000 | 2.080 | 67.309 | 48.951 | 104.795 | 37.210 | 16.446 | 13.907 | 8.042 | 2.645 | 4.587 |
| 11 | 9.760 | 0.316 | 14.435 | 3.280 | 7.064 | 4.945 | 11.671 | 2.052 | 10.817 | 12.017 | 26.361 | 6.179 |
| 12 | 1.058 | 1.328 | 10.337 | 0.000 | 0.088 | 0.240 | 1.293 | 0.000 | 0.000 | 0.703 | 71.148 | 0.000 |
| 13 | 3.233 | 8.727 | 1.804 | 7.903 | 1.501 | 0.000 | 0.000 | 2.595 | 0.000 | 1.407 | 14.192 | 9.487 |
| 14 | 0.363 | 0.000 | 18.196 | 11.482 | 4.621 | 0.150 | 2.527 | 0.000 | 1.515 | 0.826 | 25.770 | 0.000 |
| 15 | 0.000 | 1.138 | 0.000 | 0.149 | 12.098 | 0.000 | 6.858 | 0.000 | 2.363 | 13.301 | 10.955 | 0.156 |
| 16 | 95.572 | 2.245 | 0.092 | 0.000 | 3.150 | 0.000 | 0.000 | 19.795 | 2.788 | 49.870 | 2.210 | 0.406 |
| 17 | 29.309 | 0.000 | 0.000 | 9.633 | 17.014 | 14.954 | 5.685 | 1.931 | 39.419 | 10.457 | 1.120 | 23.560 |
| 18 | 1.753 | 0.000 | 12.722 | 1.253 | 11.715 | 14.085 | 0.000 | 0.121 | 4.393 | 24.186 | 7.283 | 34.888 |
| 19 | 12.963 | 12.553 | 10.979 | 0.000 | 29.759 | 0.330 | 0.000 | 0.241 | 10.635 | 6.176 | 18.674 | 10.922 |
| 20 | 45.233 | 14.545 | 0.795 | 0.000 | 2.443 | 0.000 | 0.000 | 6.850 | 2.363 | 7.950 | 13.352 | 2.309 |
| 21 | 2.085 | 0.000 | 0.000 | 5.338 | 0.883 | 8.960 | 0.000 | 19.855 | 10.362 | 0.000 | 6.380 | 0.000 |
| 22 | 9.881 | 2.340 | 0.550 | 0.000 | 3.709 | 36.140 | 0.271 | 7.272 | 1.121 | 30.821 | 0.187 | 8.706 |
| 23 | 6.255 | 5.565 | 7.737 | 0.000 | 12.687 | 0.000 | 0.000 | 13.790 | 5.969 | 19.110 | 0.000 | 6.897 |
| 24 | 52.001 | 13.344 | 3.486 | 3.221 | 10.214 | 6.952 | 6.798 | 5.945 | 62.780 | 0.306 | 9.119 | 0.000 |
| 25 | 23.719 | 23.968 | 3.639 | 2.773 | 8.713 | 26.311 | 1.594 | 3.319 | 21.119 | 14.402 | 11.858 | 0.000 |
| 26 | 35.685 | 29.122 | 4.159 | 1.044 | 0.000 | 11.118 | 4.241 | 2.474 | 10.302 | 20.303 | 9.150 | 3.433 |
| 27 | 3.203 | 0.000 | 0.245 | 1.789 | 0.000 | 0.000 | 0.000 | 0.483 | 39.631 | 11.313 | 2.832 | 9.424 |
| 28 | 4.532 | 16.790 | 0.887 | 15.776 | 0.000 | 4.675 | 0.000 | 5.673 | 41.662 | 0.489 | 13.383 | 8.613 |
| 29 | 0.514 | - | 0.000 | 45.240 | 0.000 | 9.170 | 1.685 | 0.000 | 19.058 | 16.909 | 1.556 | 3.745 |
| 30 | 4.291 | - | 0.000 | 0.328 | 0.000 | 0.839 | 0.662 | 8.660 | 2.394 | 14.891 | 45.170 | 28.054 |
| 31 | 1.058 | - | 0.000 | - | 0.000 | - | 2.106 | 2.293 | - | 0.000 | - | 6.740 |
| Total | 392.05 | 190.60 | 185.45 | 257.75 | 417.98 | 307.70 | 180.96 | 167.56 | 373.32 | 445.23 | 366.33 | 246.93 |
| Hari Hujan | 26.00 | 21.00 | 24.00 | 20.00 | 25.00 | 21.00 | 22.00 | 24.00 | 24.00 | 27.00 | 27.00 | 26.00 |
| Max | 95.572 | 29.122 | 24.313 | 67.309 | 91.014 | 104.795 | 37.210 | 19.855 | 62.780 | 53.876 | 71.148 | 34.888 |
| Avg | 12.65 | 6.81 | 5.98 | 8.59 | 13.48 | 10.26 | 5.84 | 5.41 | 12.44 | 14.36 | 12.21 | 7.97 |
Berdasarkan data hujan TRMM di Grid TRMM-0975, yang terletak di Desa Simatalu, Kecamatan Siberut Barat, Kepulauan Mentawai, Provinsi Sumatera Barat, curah hujan tahunan yang terjadi pada tahun 1999 adalah sebesar 3,531.87 mm. Dengan jumlah hari hujan tahunan adalah 287 hari (78.63%). Curah hujan harian maksimum tahunan yang tercatat adalah sebesar 104.80 mm yang terjadi pada tanggal 10 Juni 1999.
