指定気圧面の観測データ（日ごとの値）
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南大東島 1998年11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 | 1013.3 | 20 | 24.9 | 88 | 2.7 | 50 |
| 2 | 1013.8 | 20 | 25.2 | 93 | 1.1 | 210 |
| 3 | 1015.2 | 20 | 26.6 | 85 | 3.6 | 100 |
| 4 | 1013.1 | 20 | 23.5 | 93 | 3.0 | 20 |
| 5 | 1008.0 | 20 | 26.1 | 86 | 4.9 | 120 |
| 6 | 1003.9 | 20 | 25.9 | 91 | 3.8 | 260 |
| 7 | 1009.4 | 20 | 24.8 | 77 | 4.4 | 40 |
| 8 | 1011.4 | 20 | 23.5 | 79 | 2.1 | 70 |
| 9 | 1010.7 | 20 | 23.5 | 80 | 5.8 | 340 |
| 10 | 1014.0 | 20 | 23.1 | 67 | 4.4 | 360 |
| 11 | 1015.6 | 20 | 22.5 | 56 | 3.7 | 360 |
| 12 | 1015.5 | 20 | 23.7 | 53 | 4.7 | 70 |
| 13 | 1014.6 | 20 | 24.7 | 60 | 3.5 | 90 |
| 14 | 1015.1 | 20 | 25.3 | 71 | 5.4 | 80 |
| 15 | 1014.1 | 20 | 25.5 | 79 | 6.2 | 110 |
| 16 | 1011.3 | 20 | 23.4 | 90 | 1.2 | 240 |
| 17 | 1011.4 | 20 | 22.9 | 66 | 5.8 | 10 |
| 18 | 1017.0 | 20 | 20.6 | 64 | 7.5 | 40 |
| 19 | 1017.8 | 20 | 18.7 | 87 | 7.4 | 30 |
| 20 | 1018.5 | 20 | 21.5 | 65 | 5.5 | 40 |
| 21 | 1015.7 | 20 | 23.4 | 70 | 5.6 | 60 |
| 22 | 1015.1 | 20 | 20.7 | 82 | 8.7 | 40 |
| 23 | 1015.8 | 20 | 23.2 | 61 | 6.4 | 50 |
| 24 | 1014.9 | 20 | 23.8 | 67 | 5.9 | 50 |
| 25 | 1016.4 | 20 | 22.6 | 58 | 5.6 | 50 |
| 26 | 1017.3 | 20 | 23.8 | 66 | 8.3 | 80 |
| 27 | 1010.4 | 20 | 24.4 | 85 | 5.2 | 120 |
| 28 | 1010.5 | 20 | 22.9 | 73 | 5.5 | 360 |
| 29 | 1014.4 | 20 | 22.7 | 60 | 5.1 | 70 |
| 30 | 1011.1 | 20 | 24.5 | 66 | 6.0 | 190 |