指定気圧面の観測データ（日ごとの値）
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南大東島 1990年8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 | 1003.0 | 15 | 26.9 | 79 | 0.0 | - |
| 2 | 1003.8 | 15 | 28.4 | 75 | 0.0 | - |
| 3 | 1004.1 | 15 | 28.3 | 80 | 6.0 | 260 |
| 4 | 1007.7 | 15 | 27.9 | 89 | 3.2 | 210 |
| 5 | 1005.6 | 15 | 28.7 | 86 | 4.8 | 230 |
| 6 | 1001.2 | 15 | 28.5 | 89 | 7.5 | 250 |
| 7 | 1000.6 | 15 | 28.8 | 88 | 4.9 | 320 |
| 8 | 1001.4 | 15 | 28.4 | 81 | 3.4 | 320 |
| 9 | 1004.9 | 15 | 28.5 | 83 | 3.5 | 240 |
| 10 | 1009.0 | 15 | 28.6 | 88 | 1.0 | 210 |
| 11 | 1010.5 | 15 | 28.4 | 85 | 2.4 | 240 |
| 12 | 1009.2 | 15 | 27.7 | 85 | 0.0 | - |
| 13 | 1007.9 | 15 | 27.3 | 82 | 0.0 | - |
| 14 | 1006.7 | 15 | 28.4 | 79 | 3.8 | 70 |
| 15 | 1002.4 | 15 | 28.7 | 82 | 9.0 | 60 |
| 16 | 996.5 | 15 | 28.9 | 82 | 7.3 | 90 |
| 17 | 998.2 | 15 | 27.6 | 87 | 5.6 | 110 |
| 18 | 999.4 | 15 | 26.8 | 89 | 5.2 | 120 |
| 19 | 1001.7 | 15 | 26.2 | 89 | 2.6 | 180 |
| 20 | 1002.4 | 15 | 28.0 | 84 | 3.0 | 110 |
| 21 | 998.1 | 15 | 28.8 | 81 | 3.4 | 270 |
| 22 | 1004.9 | 15 | 28.7 | 87 | 3.1 | 140 |
| 23 | 1006.8 | 15 | 28.8 | 83 | 3.9 | 120 |
| 24 | 1007.9 | 15 | 28.4 | 84 | 4.3 | 100 |
| 25 | 1007.3 | 15 | 28.1 | 78 | 5.1 | 80 |
| 26 | 1008.3 | 15 | 27.7 | 76 | 3.4 | 90 |
| 27 | 1009.0 | 15 | 27.8 | 72 | 5.9 | 70 |
| 28 | 998.4 | 15 | 28.0 | 84 | 10.0 | 50 |
| 29 | 1001.6 | 15 | 28.1 | 83 | 7.4 | 120 |
| 30 | 1006.8 | 15 | 27.6 | 87 | 4.8 | 140 |
| 31 | 1008.6 | 15 | 27.7 | 86 | 4.9 | 140 |