指定気圧面の観測データ（日ごとの値）
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根室 1989年7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 | 1015.9 | 26 | 6.4 | 95 | 3.0 | 30 |
| 2 | 1017.4 | 26 | 8.4 | 92 | 1.7 | 200 |
| 3 | 1015.1 | 26 | 7.2 | 96 | 2.8 | 180 |
| 4 | 1012.4 | 26 | 10.7 | 94 | 2.5 | 170 |
| 5 | 1010.5 | 26 | 10.8 | 99 | 2.9 | 220 |
| 6 | 1010.2 | 26 | 12.6 | 98 | 2.9 | 170 |
| 7 | 1008.3 | 26 | 14.2 | 97 | 3.5 | 210 |
| 8 | 1013.4 | 26 | 15.0 | 83 | 3.2 | 150 |
| 9 | 1009.9 | 26 | 12.9 | 99 | 4.3 | 150 |
| 10 | 998.4 | 26 | 13.2 | 93 | 0.2 | - |
| 11 | 1007.9 | 26 | 10.7 | 88 | 2.0 | 120 |
| 12 | 1006.2 | 26 | 11.3 | 99 | 1.8 | 130 |
| 13 | 1011.1 | 26 | 10.5 | 100 | 2.8 | 40 |
| 14 | 1014.8 | 26 | 10.6 | 99 | 2.3 | 140 |
| 15 | 1015.7 | 26 | 13.6 | 96 | 2.2 | 160 |
| 16 | 1014.6 | 26 | 13.8 | 91 | 1.6 | 220 |
| 17 | 1016.7 | 26 | 16.6 | 91 | 3.5 | 180 |
| 18 | 1018.1 | 26 | 15.2 | 98 | 2.9 | 180 |
| 19 | 1017.2 | 26 | 17.7 | 95 | 3.9 | 220 |
| 20 | 1015.9 | 26 | 18.2 | 93 | 3.7 | 210 |
| 21 | 1010.8 | 26 | 16.8 | 98 | 3.2 | 200 |
| 22 | 1006.5 | 26 | 20.2 | 87 | 5.9 | 230 |
| 23 | 1006.5 | 26 | 17.1 | 91 | 3.8 | 180 |
| 24 | 1008.1 | 26 | 17.2 | 93 | 4.1 | 190 |
| 25 | 1013.6 | 26 | 17.6 | 99 | 4.0 | 170 |
| 26 | 1018.5 | 26 | 16.9 | 99 | 4.5 | 170 |
| 27 | 1021.2 | 26 | 18.2 | 99 | 4.2 | 150 |
| 28 | 1021.2 | 26 | 19.4 | 99 | 2.2 | 180 |
| 29 | 1019.6 | 26 | 19.9 | 97 | 2.0 | 160 |
| 30 | 1013.7 | 26 | 20.6 | 94 | 4.0 | 220 |
| 31 | 1004.6 | 26 | 20.6 | 98 | 4.6 | 210 |