指定気圧面の観測データ（日ごとの値）
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札幌 1989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 | 999.0 | 19 | 4.8 | 75 | 1.1 | 210 |
| 2 | 1003.1 | 19 | 7.6 | 48 | 3.3 | 160 |
| 3 | 998.8 | 19 | 7.0 | 53 | 0.9 | 320 |
| 4 | 1008.5 | 19 | 1.4 | 44 | 1.3 | 270 |
| 5 | 1007.8 | 19 | 3.1 | 63 | 1.8 | 240 |
| 6 | 1012.3 | 19 | 4.1 | 48 | 0.3 | 300 |
| 7 | 1013.7 | 19 | 8.2 | 33 | 3.6 | 140 |
| 8 | 1014.5 | 19 | 10.3 | 74 | 5.0 | 140 |
| 9 | 1010.1 | 19 | 8.2 | 91 | 2.2 | 320 |
| 10 | 1013.0 | 19 | 7.3 | 87 | 0.3 | 360 |
| 11 | 1014.9 | 19 | 8.1 | 69 | 1.5 | 110 |
| 12 | 1015.1 | 19 | 7.1 | 84 | 2.1 | 360 |
| 13 | 1010.9 | 19 | 9.7 | 74 | 0.7 | 290 |
| 14 | 1008.7 | 19 | 10.7 | 53 | 3.6 | 110 |
| 15 | 1008.2 | 19 | 8.5 | 81 | 1.7 | 360 |
| 16 | 994.4 | 19 | 8.8 | 93 | 1.1 | 60 |
| 17 | 991.6 | 19 | 3.7 | 86 | 5.0 | 320 |
| 18 | 1009.6 | 19 | 5.8 | 65 | 4.4 | 330 |
| 19 | 1014.2 | 19 | 5.6 | 73 | 2.5 | 330 |
| 20 | 1012.0 | 19 | 5.0 | 71 | 5.1 | 320 |
| 21 | 1016.5 | 19 | 5.9 | 54 | 1.0 | 280 |
| 22 | 1005.9 | 19 | 7.1 | 83 | 4.2 | 140 |
| 23 | 1010.7 | 19 | 7.7 | 82 | 1.0 | 330 |
| 24 | 1002.9 | 19 | 9.3 | 67 | 2.5 | 340 |
| 25 | 1010.4 | 19 | 2.8 | 59 | 3.9 | 340 |
| 26 | 1017.9 | 19 | 3.5 | 89 | 1.6 | 330 |
| 27 | 1012.5 | 19 | 4.6 | 81 | 1.0 | 260 |
| 28 | 1014.9 | 19 | 4.1 | 54 | 3.8 | 340 |
| 29 | 1011.9 | 19 | 7.9 | 79 | 1.7 | 360 |
| 30 | 1012.9 | 19 | 8.4 | 79 | 1.7 | 30 |