指定気圧面の観測データ（日ごとの値）
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南大東島 1991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 | 1019.7 | 15 | 17.4 | 80 | 3.8 | 10 |
| 2 | 1020.5 | 15 | 18.7 | 69 | 4.1 | 340 |
| 3 | 1020.9 | 15 | 20.0 | 68 | 5.4 | 70 |
| 4 | 1017.8 | 15 | 20.7 | 71 | 4.1 | 110 |
| 5 | 1014.0 | 15 | 20.9 | 89 | 4.5 | 80 |
| 6 | 1011.8 | 15 | 21.8 | 88 | 2.6 | 170 |
| 7 | 1010.0 | 15 | 21.4 | 93 | 4.2 | 180 |
| 8 | 1012.2 | 15 | 19.0 | 88 | 0.3 | 300 |
| 9 | 1012.3 | 15 | 21.5 | 78 | 1.1 | 90 |
| 10 | 1008.5 | 15 | 23.4 | 93 | 5.3 | 190 |
| 11 | 1009.5 | 15 | 23.4 | 94 | 4.5 | 230 |
| 12 | 1009.5 | 15 | 23.4 | 94 | 3.2 | 220 |
| 13 | 1010.3 | 15 | 23.0 | 95 | 2.9 | 210 |
| 14 | 1012.7 | 15 | 22.2 | 84 | 1.7 | 360 |
| 15 | 1014.8 | 15 | 22.1 | 87 | 1.6 | 100 |
| 16 | 1016.3 | 15 | 23.9 | 88 | 2.8 | 60 |
| 17 | 1013.5 | 15 | 24.3 | 89 | 2.5 | 120 |
| 18 | 1009.5 | 15 | 25.2 | 93 | 3.4 | 180 |
| 19 | 1009.7 | 15 | 22.1 | 84 | 3.7 | 330 |
| 20 | 1011.6 | 15 | 20.2 | 66 | 1.4 | 340 |
| 21 | 1015.3 | 15 | 20.4 | 62 | 2.0 | 20 |
| 22 | 1019.2 | 15 | 21.9 | 64 | 4.2 | 90 |
| 23 | 1018.7 | 15 | 23.0 | 87 | 5.2 | 100 |
| 24 | 1016.5 | 15 | 23.5 | 92 | 1.7 | 90 |
| 25 | 1015.7 | 15 | 23.0 | 84 | 3.6 | 70 |
| 26 | 1013.5 | 15 | 25.1 | 92 | 2.5 | 190 |
| 27 | 1012.7 | 15 | 25.1 | 90 | 2.8 | 230 |
| 28 | 1009.5 | 15 | 25.0 | 89 | 5.4 | 200 |
| 29 | 1004.2 | 15 | 24.0 | 91 | 8.5 | 250 |
| 30 | 1008.1 | 15 | 19.5 | 80 | 0.0 | - |