| Tahun Data | : | 1999 |
| Nama Stasiun | : | TRMM-0903 |
| Lokasi Stasiun | : | Desa Malancan, Kecamatan Siberut Utara, Kepulauan Mentawai, Provinsi Sumatera Barat |
| Longitude | : | 98.875000 |
| Latitude | : | -1.125000 |
| Tanggal | Jan | Feb | Mar | Apr | Mei | Jun | Jul | Agu | Sep | Okt | Nov | Des |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 6.958 | 12.617 | 4.536 | 0.000 | 110.776 | 0.000 | 4.638 | 0.000 | 0.000 | 16.425 | 0.000 | 17.235 |
| 2 | 70.673 | 2.129 | 4.628 | 0.000 | 4.684 | 0.329 | 1.466 | 0.000 | 25.081 | 53.066 | 0.000 | 25.263 |
| 3 | 9.348 | 43.252 | 19.922 | 0.000 | 32.938 | 0.090 | 36.297 | 0.000 | 37.682 | 0.000 | 0.000 | 4.433 |
| 4 | 2.360 | 5.657 | 0.000 | 0.000 | 31.495 | 6.435 | 20.887 | 5.874 | 16.270 | 21.288 | 9.998 | 4.650 |
| 5 | 0.000 | 0.000 | 10.298 | 29.052 | 1.944 | 21.100 | 1.706 | 4.675 | 0.000 | 23.735 | 26.538 | 19.157 |
| 6 | 0.000 | 0.000 | 2.329 | 15.304 | 0.088 | 0.000 | 19.450 | 4.645 | 0.000 | 12.693 | 29.473 | 34.562 |
| 7 | 0.000 | 0.000 | 0.337 | 36.479 | 40.421 | 0.000 | 9.396 | 12.796 | 0.000 | 1.407 | 32.744 | 0.000 |
| 8 | 0.696 | 2.479 | 2.207 | 1.707 | 8.397 | 39.476 | 11.640 | 0.000 | 7.518 | 48.020 | 1.712 | 1.426 |
| 9 | 2.481 | 2.701 | 9.440 | 4.912 | 15.880 | 0.449 | 11.102 | 13.605 | 4.722 | 0.000 | 0.000 | 3.441 |
| 10 | 0.030 | 0.000 | 0.000 | 15.364 | 6.923 | 75.749 | 28.398 | 11.118 | 15.338 | 21.165 | 1.345 | 4.061 |
| 11 | 10.256 | 0.000 | 17.439 | 2.216 | 7.041 | 4.040 | 8.379 | 2.038 | 9.293 | 17.862 | 17.488 | 0.558 |
| 12 | 0.605 | 4.258 | 20.136 | 0.000 | 0.000 | 0.569 | 0.209 | 0.000 | 0.000 | 2.172 | 108.933 | 1.612 |
| 13 | 2.814 | 17.765 | 10.635 | 5.511 | 18.266 | 0.000 | 0.000 | 1.798 | 0.000 | 1.162 | 13.422 | 4.898 |
| 14 | 7.745 | 0.000 | 19.707 | 11.950 | 9.074 | 0.000 | 10.832 | 0.210 | 10.857 | 1.101 | 37.361 | 1.085 |
| 15 | 0.000 | 0.953 | 0.000 | 0.000 | 12.963 | 0.150 | 3.740 | 2.877 | 0.391 | 0.214 | 8.989 | 0.000 |
| 16 | 65.288 | 1.462 | 0.000 | 0.509 | 0.766 | 0.150 | 0.000 | 19.689 | 0.000 | 39.823 | 3.394 | 2.821 |
| 17 | 18.878 | 0.636 | 0.000 | 4.972 | 1.414 | 9.278 | 11.431 | 13.605 | 32.780 | 7.432 | 5.717 | 23.000 |
| 18 | 1.997 | 0.000 | 10.237 | 0.000 | 15.850 | 11.822 | 0.000 | 2.308 | 3.098 | 20.829 | 10.731 | 38.034 |
| 19 | 8.229 | 0.953 | 7.448 | 0.599 | 29.638 | 0.000 | 0.000 | 0.899 | 13.593 | 6.668 | 26.630 | 8.710 |
| 20 | 30.798 | 8.708 | 0.000 | 0.000 | 1.031 | 0.000 | 0.000 | 12.077 | 6.135 | 8.564 | 8.071 | 0.992 |
| 21 | 2.420 | 0.000 | 0.766 | 4.852 | 0.354 | 34.268 | 0.000 | 35.332 | 19.698 | 0.000 | 2.171 | 0.000 |
| 22 | 6.535 | 0.000 | 1.134 | 0.000 | 2.475 | 28.342 | 0.090 | 7.312 | 6.135 | 27.130 | 0.367 | 10.291 |
| 23 | 8.532 | 5.466 | 4.322 | 0.000 | 8.986 | 0.449 | 0.000 | 8.871 | 7.518 | 30.555 | 0.000 | 6.479 |
| 24 | 57.331 | 9.629 | 8.582 | 12.190 | 14.701 | 16.102 | 5.895 | 3.566 | 33.622 | 5.903 | 7.124 | 0.000 |
| 25 | 23.447 | 32.034 | 3.923 | 5.002 | 3.241 | 12.690 | 1.077 | 5.544 | 42.554 | 4.190 | 15.042 | 0.000 |
| 26 | 16.700 | 21.324 | 9.869 | 1.587 | 0.000 | 24.841 | 2.514 | 4.315 | 13.383 | 17.006 | 8.989 | 0.000 |
| 27 | 2.239 | 0.000 | 5.486 | 10.483 | 0.000 | 0.000 | 0.000 | 2.577 | 53.441 | 7.830 | 12.596 | 1.116 |
| 28 | 9.409 | 6.229 | 1.839 | 15.903 | 0.000 | 2.813 | 0.000 | 9.200 | 48.058 | 0.000 | 23.542 | 0.992 |
| 29 | 1.059 | - | 0.000 | 40.463 | 0.000 | 16.012 | 6.912 | 0.000 | 29.412 | 17.250 | 4.097 | 14.228 |
| 30 | 1.392 | - | 0.552 | 1.737 | 0.000 | 0.000 | 0.928 | 11.358 | 2.015 | 14.406 | 54.276 | 33.447 |
| 31 | 0.363 | - | 0.090 | - | 0.000 | - | 1.915 | 2.038 | - | 0.000 | - | 2.821 |
| Total | 368.58 | 178.25 | 175.86 | 220.79 | 379.35 | 305.15 | 198.90 | 198.33 | 438.59 | 427.90 | 470.75 | 265.31 |
| Hari Hujan | 27.00 | 18.00 | 24.00 | 20.00 | 24.00 | 21.00 | 22.00 | 25.00 | 23.00 | 26.00 | 25.00 | 25.00 |
| Max | 70.673 | 43.252 | 20.136 | 40.463 | 110.776 | 75.749 | 36.297 | 35.332 | 53.441 | 53.066 | 108.933 | 38.034 |
| Avg | 11.89 | 6.37 | 5.67 | 7.36 | 12.24 | 10.17 | 6.42 | 6.40 | 14.62 | 13.80 | 15.69 | 8.56 |
Berdasarkan data hujan TRMM di Grid TRMM-0903, yang terletak di Desa Malancan, Kecamatan Siberut Utara, Kepulauan Mentawai, Provinsi Sumatera Barat, curah hujan tahunan yang terjadi pada tahun 1999 adalah sebesar 3,627.77 mm. Dengan jumlah hari hujan tahunan adalah 280 hari (76.71%). Curah hujan harian maksimum tahunan yang tercatat adalah sebesar 110.78 mm yang terjadi pada tanggal 1 Mei 1999.
