| Tahun Data | : | 1998 |
| 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 | 0.000 | 1.550 | 0.000 | 11.280 | 22.598 | 45.627 | 0.000 | 0.000 | 0.000 | 0.000 | 24.196 | 10.630 |
| 2 | 8.203 | 0.496 | 10.254 | 37.909 | 0.000 | 0.000 | 0.300 | 9.525 | 0.000 | 2.479 | 11.526 | 14.304 |
| 3 | 12.167 | 0.000 | 1.106 | 41.440 | 3.296 | 0.281 | 2.458 | 20.868 | 13.484 | 0.520 | 21.517 | 0.000 |
| 4 | 5.684 | 21.268 | 3.020 | 0.419 | 0.000 | 45.908 | 0.660 | 5.209 | 0.000 | 5.112 | 16.131 | 15.448 |
| 5 | 4.762 | 1.953 | 11.480 | 0.060 | 3.474 | 4.366 | 0.120 | 0.339 | 2.434 | 26.019 | 5.628 | 8.191 |
| 6 | 6.729 | 0.000 | 5.172 | 45.838 | 0.000 | 1.871 | 0.000 | 1.171 | 12.331 | 0.000 | 0.000 | 9.787 |
| 7 | 0.000 | 23.284 | 37.610 | 2.124 | 0.000 | 9.356 | 5.846 | 5.240 | 30.043 | 0.061 | 0.000 | 17.405 |
| 8 | 0.000 | 0.000 | 8.550 | 3.860 | 38.664 | 0.000 | 3.777 | 35.940 | 1.730 | 4.530 | 0.963 | 0.060 |
| 9 | 19.756 | 0.000 | 1.196 | 5.894 | 19.065 | 6.549 | 4.557 | 25.615 | 12.171 | 0.000 | 2.227 | 34.540 |
| 10 | 0.277 | 0.000 | 6.966 | 41.051 | 9.443 | 0.000 | 16.727 | 0.062 | 1.890 | 2.479 | 28.891 | 9.636 |
| 11 | 6.514 | 1.426 | 0.000 | 0.000 | 71.270 | 0.000 | 16.128 | 31.101 | 0.833 | 8.265 | 14.897 | 34.961 |
| 12 | 0.000 | 0.000 | 4.514 | 34.169 | 6.177 | 1.840 | 12.501 | 39.670 | 4.132 | 0.673 | 10.593 | 3.644 |
| 13 | 9.770 | 0.000 | 12.885 | 4.309 | 48.404 | 0.062 | 0.660 | 7.059 | 0.416 | 5.816 | 1.023 | 0.000 |
| 14 | 3.287 | 47.063 | 20.599 | 2.035 | 22.747 | 0.000 | 18.856 | 13.532 | 0.000 | 5.020 | 2.859 | 36.708 |
| 15 | 12.505 | 9.518 | 13.722 | 0.509 | 0.000 | 10.541 | 2.608 | 42.845 | 6.758 | 1.316 | 47.940 | 3.854 |
| 16 | 19.971 | 3.751 | 0.448 | 7.540 | 39.852 | 2.807 | 2.338 | 0.524 | 13.868 | 2.663 | 32.111 | 2.138 |
| 17 | 4.455 | 5.860 | 31.421 | 9.096 | 17.758 | 9.169 | 52.820 | 18.124 | 7.879 | 9.122 | 1.414 | 8.221 |
| 18 | 0.584 | 13.673 | 11.779 | 4.099 | 3.920 | 5.583 | 22.333 | 27.711 | 2.402 | 4.439 | 5.808 | 29.511 |
| 19 | 11.276 | 13.735 | 0.000 | 24.415 | 0.000 | 2.589 | 42.928 | 4.100 | 8.103 | 0.000 | 0.000 | 45.320 |
| 20 | 9.402 | 0.000 | 3.498 | 0.000 | 0.000 | 14.752 | 69.218 | 0.863 | 0.256 | 6.796 | 0.000 | 24.151 |
| 21 | 0.000 | 0.000 | 6.876 | 2.872 | 0.000 | 0.780 | 17.537 | 0.123 | 17.135 | 22.468 | 23.293 | 1.476 |
| 22 | 0.000 | 0.000 | 10.015 | 0.000 | 3.148 | 0.062 | 7.554 | 24.012 | 17.487 | 6.183 | 5.718 | 9.184 |
| 23 | 0.000 | 0.217 | 67.865 | 44.342 | 1.574 | 22.580 | 0.000 | 36.865 | 15.886 | 57.854 | 0.000 | 7.137 |
| 24 | 0.000 | 0.000 | 0.000 | 7.899 | 4.454 | 0.561 | 0.000 | 14.395 | 11.210 | 4.561 | 0.813 | 22.675 |
| 25 | 0.000 | 0.000 | 9.238 | 0.000 | 0.000 | 0.156 | 53.300 | 23.118 | 15.374 | 67.497 | 2.377 | 8.462 |
| 26 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 12.561 | 20.220 | 1.281 | 32.111 | 6.230 | 18.821 |
| 27 | 0.000 | 0.217 | 11.002 | 2.424 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 6.214 | 8.065 | 0.000 |
| 28 | 0.000 | 0.000 | 4.335 | 5.116 | 0.327 | 2.589 | 0.000 | 5.178 | 0.000 | 0.429 | 3.100 | 1.355 |
| 29 | 12.996 | - | 0.628 | 25.163 | 0.000 | 0.031 | 12.710 | 18.987 | 4.036 | 2.633 | 60.821 | 13.280 |
| 30 | 5.807 | - | 8.550 | 0.898 | 0.000 | 0.000 | 11.481 | 14.302 | 5.637 | 33.304 | 6.440 | 19.784 |
| 31 | 0.000 | - | 26.787 | - | 0.267 | - | 5.003 | 0.123 | - | 24.804 | - | 72.625 |
| Total | 154.15 | 144.01 | 329.52 | 364.76 | 316.44 | 188.06 | 394.98 | 446.82 | 206.78 | 343.37 | 344.58 | 483.31 |
| Hari Hujan | 18.00 | 14.00 | 26.00 | 25.00 | 18.00 | 22.00 | 25.00 | 29.00 | 24.00 | 27.00 | 25.00 | 28.00 |
| Max | 19.971 | 47.063 | 67.865 | 45.838 | 71.270 | 45.908 | 69.218 | 42.845 | 30.043 | 67.497 | 60.821 | 72.625 |
| Avg | 4.97 | 5.14 | 10.63 | 12.16 | 10.21 | 6.27 | 12.74 | 14.41 | 6.89 | 11.08 | 11.49 | 15.59 |
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 1998 adalah sebesar 3,716.77 mm. Dengan jumlah hari hujan tahunan adalah 281 hari (76.99%). Curah hujan harian maksimum tahunan yang tercatat adalah sebesar 72.63 mm yang terjadi pada tanggal 31 Desember 1998.
