指定気圧面の観測データ（日ごとの値）
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札幌 2004年12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 | 1019.9 | 26 | 2.1 | 50 | 4.8 | 290 |
| 2 | 1028.9 | 26 | 2.3 | 48 | 3.3 | 250 |
| 3 | 1012.3 | 26 | 8.4 | 69 | 2.3 | 110 |
| 4 | 1008.1 | 26 | 3.8 | 78 | 3.6 | 100 |
| 5 | 992.7 | 26 | -0.1 | 93 | 2.4 | 340 |
| 6 | 1020.5 | 26 | 0.2 | 79 | 2.8 | 130 |
| 7 | 1014.1 | 26 | 3.5 | 62 | 2.7 | 360 |
| 8 | 1022.4 | 26 | -1.9 | 47 | 2.0 | 330 |
| 9 | 1026.1 | 26 | 2.0 | 66 | 4.1 | 140 |
| 10 | 1009.7 | 26 | 5.3 | 85 | 3.3 | 320 |
| 11 | 1020.5 | 26 | -1.6 | 52 | 4.7 | 300 |
| 12 | 1018.2 | 26 | -0.7 | 54 | 3.1 | 150 |
| 13 | 1019.2 | 26 | -1.8 | 47 | 4.9 | 290 |
| 14 | 1023.7 | 26 | -1.0 | 50 | 0.9 | 260 |
| 15 | 1017.1 | 26 | 1.6 | 88 | 1.0 | 190 |
| 16 | 1004.2 | 26 | 0.3 | 71 | 3.9 | 300 |
| 17 | 1016.6 | 26 | -1.1 | 67 | 2.5 | 270 |
| 18 | 1014.5 | 26 | -3.2 | 79 | 1.0 | 190 |
| 19 | 1022.6 | 26 | -3.0 | 63 | 1.8 | 130 |
| 20 | 1000.5 | 26 | 3.8 | 48 | 6.0 | 240 |
| 21 | 1002.8 | 26 | -4.2 | 67 | 2.0 | 50 |
| 22 | 999.8 | 26 | -7.8 | 72 | 1.8 | 160 |
| 23 | 1007.3 | 26 | 1.8 | 72 | 5.4 | 330 |
| 24 | 1013.4 | 26 | -3.3 | 85 | 1.0 | 230 |
| 25 | 1008.5 | 26 | -3.1 | 76 | 1.4 | 250 |
| 26 | 1007.3 | 26 | -1.8 | 65 | 1.0 | 340 |
| 27 | 1008.5 | 26 | -6.0 | 61 | 2.1 | 180 |
| 28 | 1014.7 | 26 | -7.2 | 57 | 2.2 | 260 |
| 29 | 1008.3 | 26 | -7.0 | 56 | 0.8 | 260 |
| 30 | 1013.4 | 26 | -4.4 | 54 | 1.9 | 170 |
| 31 | 1009.4 | 26 | -6.6 | 66 | 0.5 | 120 |