21 (火)	10:31	03:44	23:26	17:32
	89cm	56cm	73cm	54cm
若潮 出 06:53 入 15:47 出 00:35 入 12:34

コイセボイ（北海道）2038年12月21日の10分毎の潮の高低差を確認できます。
また1日の潮の高低差が1番大きい（潮の流れが大きい）時間に「最大潮位差」と明記してます。

時刻	潮位	高低差	各ポイント
12/21 00:00	71.3	↓-0.9
12/21 00:10	70.3	↓-1.0
12/21 00:20	69.4	↓-0.9
12/21 00:30	68.4	↓-1.0
12/21 00:40	67.4	↓-1.0
12/21 00:50	66.4	↓-1.0
12/21 01:00	65.5	↓-0.9
12/21 01:10	64.5	↓-1.0
12/21 01:20	63.5	↓-1.0
12/21 01:30	62.6	↓-0.9
12/21 01:40	61.7	↓-0.9
12/21 01:50	60.9	↓-0.8
12/21 02:00	60.1	↓-0.8
12/21 02:10	59.4	↓-0.7
12/21 02:20	58.7	↓-0.7
12/21 02:30	58.0	↓-0.7
12/21 02:40	57.5	↓-0.5
12/21 02:50	57.0	↓-0.5
12/21 03:00	56.6	↓-0.4
12/21 03:10	56.3	↓-0.3
12/21 03:20	56.0	↓-0.3
12/21 03:30	55.9	↓-0.1
12/21 03:40	55.8	↓-0.1	干潮
12/21 03:50	55.8	0
12/21 04:00	55.9	↑0.1
12/21 04:10	56.1	↑0.2
12/21 04:20	56.4	↑0.3
12/21 04:30	56.8	↑0.4
12/21 04:40	57.3	↑0.5
12/21 04:50	57.8	↑0.5
12/21 05:00	58.4	↑0.6
12/21 05:10	59.2	↑0.8
12/21 05:20	59.9	↑0.7
12/21 05:30	60.8	↑0.9
12/21 05:40	61.7	↑0.9
12/21 05:50	62.7	↑1.0
12/21 06:00	63.8	↑1.1
12/21 06:10	64.9	↑1.1
12/21 06:20	66.0	↑1.1
12/21 06:30	67.2	↑1.2
12/21 06:40	68.4	↑1.2
12/21 06:50	69.7	↑1.3
12/21 07:00	70.9	↑1.2
12/21 07:10	72.2	↑1.3
12/21 07:20	73.4	↑1.2
12/21 07:30	74.7	↑1.3
12/21 07:40	75.9	↑1.2
12/21 07:50	77.1	↑1.2
12/21 08:00	78.3	↑1.2
12/21 08:10	79.5	↑1.2
12/21 08:20	80.6	↑1.1
12/21 08:30	81.6	↑1.0
12/21 08:40	82.6	↑1.0
12/21 08:50	83.5	↑0.9
12/21 09:00	84.4	↑0.9
12/21 09:10	85.2	↑0.8
12/21 09:20	85.9	↑0.7
12/21 09:30	86.5	↑0.6
12/21 09:40	87.0	↑0.5
12/21 09:50	87.5	↑0.5
12/21 10:00	87.8	↑0.3
12/21 10:10	88.1	↑0.3
12/21 10:20	88.2	↑0.1
12/21 10:30	88.3	↑0.1	満潮
12/21 10:40	88.2	↓-0.1
12/21 10:50	88.0	↓-0.2
12/21 11:00	87.8	↓-0.2
12/21 11:10	87.4	↓-0.4
12/21 11:20	87.0	↓-0.4
12/21 11:30	86.5	↓-0.5
12/21 11:40	85.8	↓-0.7
12/21 11:50	85.1	↓-0.7
12/21 12:00	84.3	↓-0.8
12/21 12:10	83.4	↓-0.9
12/21 12:20	82.5	↓-0.9
12/21 12:30	81.4	↓-1.1
12/21 12:40	80.4	↓-1.0
12/21 12:50	79.2	↓-1.2
12/21 13:00	78.0	↓-1.2
12/21 13:10	76.8	↓-1.2
12/21 13:20	75.5	↓-1.3
12/21 13:30	74.3	↓-1.2
12/21 13:40	73.0	↓-1.3
12/21 13:50	71.6	↓-1.4	最大潮位差
12/21 14:00	70.3	↓-1.3
12/21 14:10	69.0	↓-1.3
12/21 14:20	67.7	↓-1.3
12/21 14:30	66.4	↓-1.3
12/21 14:40	65.2	↓-1.2
12/21 14:50	63.9	↓-1.3
12/21 15:00	62.8	↓-1.1
12/21 15:10	61.6	↓-1.2
12/21 15:20	60.5	↓-1.1
12/21 15:30	59.5	↓-1.0
12/21 15:40	58.5	↓-1.0
12/21 15:50	57.7	↓-0.8
12/21 16:00	56.8	↓-0.9
12/21 16:10	56.1	↓-0.7
12/21 16:20	55.4	↓-0.7
12/21 16:30	54.9	↓-0.5
12/21 16:40	54.4	↓-0.5
12/21 16:50	54.0	↓-0.4
12/21 17:00	53.6	↓-0.4
12/21 17:10	53.4	↓-0.2
12/21 17:20	53.3	↓-0.1
12/21 17:30	53.2	↓-0.1	干潮
12/21 17:40	53.3	↑0.1
12/21 17:50	53.4	↑0.1
12/21 18:00	53.6	↑0.2
12/21 18:10	53.9	↑0.3
12/21 18:20	54.3	↑0.4
12/21 18:30	54.7	↑0.4
12/21 18:40	55.2	↑0.5
12/21 18:50	55.8	↑0.6
12/21 19:00	56.4	↑0.6
12/21 19:10	57.0	↑0.6
12/21 19:20	57.8	↑0.8
12/21 19:30	58.5	↑0.7
12/21 19:40	59.3	↑0.8
12/21 19:50	60.1	↑0.8
12/21 20:00	61.0	↑0.9
12/21 20:10	61.8	↑0.8
12/21 20:20	62.7	↑0.9
12/21 20:30	63.5	↑0.8
12/21 20:40	64.4	↑0.9
12/21 20:50	65.2	↑0.8
12/21 21:00	66.1	↑0.9
12/21 21:10	66.9	↑0.8
12/21 21:20	67.6	↑0.7
12/21 21:30	68.3	↑0.7
12/21 21:40	69.0	↑0.7
12/21 21:50	69.7	↑0.7
12/21 22:00	70.2	↑0.5
12/21 22:10	70.8	↑0.6
12/21 22:20	71.2	↑0.4
12/21 22:30	71.6	↑0.4
12/21 22:40	72.0	↑0.4
12/21 22:50	72.3	↑0.3
12/21 23:00	72.5	↑0.2
12/21 23:10	72.6	↑0.1
12/21 23:20	72.7	↑0.1	満潮
12/21 23:30	72.7	0
12/21 23:40	72.6	↓-0.1
12/21 23:50	72.5	↓-0.1