指定気圧面の観測データ（日ごとの値）
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南鳥島 1999年4月21時 地上
| 日 | 気圧(hPa) | 高度(m) | 気温(℃) | 相対湿度(%) | 風速(m/s) | 風向(°) |
|---|---|---|---|---|---|---|
| 1 | 1016.4 | 9 | 24.1 | 76 | 6.8 | 360 |
| 2 | 1017.5 | 9 | 23.1 | 79 | 7.6 | 80 |
| 3 | 1015.3 | 9 | 25.5 | 81 | 3.1 | 200 |
| 4 | 1014.9 | 9 | 25.8 | 84 | 1.5 | 110 |
| 5 | 1013.7 | 9 | 25.2 | 85 | 2.0 | 220 |
| 6 | 1014.5 | 9 | 25.4 | 85 | 2.7 | 160 |
| 7 | 1015.5 | 9 | 25.8 | 80 | 3.2 | 180 |
| 8 | 1015.2 | 9 | 26.3 | 79 | 2.9 | 250 |
| 9 | 1019.6 | 9 | 21.7 | 77 | 8.2 | 40 |
| 10 | 1019.6 | 9 | 23.5 | 74 | 9.8 | 80 |
| 11 | 1014.1 | 9 | 25.6 | 87 | 4.5 | 140 |
| 12 | 1014.4 | 9 | 25.8 | 89 | 3.2 | 140 |
| 13 | 1018.3 | 9 | 25.7 | 90 | 1.7 | 100 |
| 14 | 1018.4 | 9 | 26.4 | 84 | 4.0 | 100 |
| 15 | 1018.7 | 9 | 26.1 | 78 | 5.9 | 90 |
| 16 | 1017.2 | 9 | 25.6 | 85 | 5.8 | 70 |
| 17 | 1015.0 | 9 | 26.1 | 78 | 3.0 | 110 |
| 18 | 1013.8 | 9 | 25.9 | 82 | 2.6 | 70 |
| 19 | 1012.7 | 9 | 25.7 | 84 | 1.7 | 220 |
| 20 | 1013.2 | 9 | 26.3 | 78 | 1.9 | 280 |
| 21 | 1012.6 | 9 | 26.0 | 76 | 2.2 | 320 |
| 22 | 1014.7 | 9 | 22.9 | 64 | 4.1 | 40 |
| 23 | 1014.9 | 9 | 22.8 | 67 | 6.6 | 70 |
| 24 | 1016.6 | 9 | 23.7 | 73 | 6.6 | 70 |
| 25 | 1016.9 | 9 | 25.1 | 72 | 8.2 | 90 |
| 26 | 1014.9 | 9 | 26.0 | 76 | 7.5 | 120 |
| 27 | 1011.0 | 9 | 26.1 | 88 | 4.9 | 160 |
| 28 | 1007.5 | 9 | 25.0 | 90 | 6.1 | 220 |
| 29 | 1009.7 | 9 | 25.1 | 82 | 2.5 | 300 |
| 30 | 1014.7 | 9 | 24.6 | 81 | 3.9 | 50 |