31 (月)	10:29	03:37	23:42	17:47
	81cm	38cm	63cm	36cm
長潮 出 07:04 入 16:18 出 01:00 入 12:37

函館（北海道）2018年12月31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
12/31 00:00	57.2	↓-1.1
12/31 00:10	56.1	↓-1.1
12/31 00:20	55.0	↓-1.1
12/31 00:30	53.8	↓-1.2
12/31 00:40	52.6	↓-1.2
12/31 00:50	51.3	↓-1.3
12/31 01:00	50.1	↓-1.2
12/31 01:10	48.9	↓-1.2
12/31 01:20	47.6	↓-1.3
12/31 01:30	46.4	↓-1.2
12/31 01:40	45.3	↓-1.1
12/31 01:50	44.2	↓-1.1
12/31 02:00	43.1	↓-1.1
12/31 02:10	42.1	↓-1.0
12/31 02:20	41.3	↓-0.8
12/31 02:30	40.5	↓-0.8
12/31 02:40	39.8	↓-0.7
12/31 02:50	39.2	↓-0.6
12/31 03:00	38.7	↓-0.5
12/31 03:10	38.3	↓-0.4
12/31 03:20	38.1	↓-0.2
12/31 03:30	38.0	↓-0.1	干潮
12/31 03:40	38.0	0
12/31 03:50	38.1	↑0.1
12/31 04:00	38.3	↑0.2
12/31 04:10	38.6	↑0.3
12/31 04:20	39.0	↑0.4
12/31 04:30	39.6	↑0.6
12/31 04:40	40.2	↑0.6
12/31 04:50	40.9	↑0.7
12/31 05:00	41.7	↑0.8
12/31 05:10	42.5	↑0.8
12/31 05:20	43.5	↑1.0
12/31 05:30	44.5	↑1.0
12/31 05:40	45.6	↑1.1
12/31 05:50	46.7	↑1.1
12/31 06:00	47.9	↑1.2
12/31 06:10	49.2	↑1.3
12/31 06:20	50.6	↑1.4
12/31 06:30	52.0	↑1.4
12/31 06:40	53.4	↑1.4
12/31 06:50	54.9	↑1.5
12/31 07:00	56.5	↑1.6
12/31 07:10	58.1	↑1.6
12/31 07:20	59.7	↑1.6
12/31 07:30	61.3	↑1.6
12/31 07:40	63.0	↑1.7
12/31 07:50	64.6	↑1.6
12/31 08:00	66.3	↑1.7
12/31 08:10	67.9	↑1.6
12/31 08:20	69.4	↑1.5
12/31 08:30	70.9	↑1.5
12/31 08:40	72.4	↑1.5
12/31 08:50	73.7	↑1.3
12/31 09:00	75.0	↑1.3
12/31 09:10	76.1	↑1.1
12/31 09:20	77.2	↑1.1
12/31 09:30	78.1	↑0.9
12/31 09:40	78.8	↑0.7
12/31 09:50	79.5	↑0.7
12/31 10:00	80.0	↑0.5
12/31 10:10	80.3	↑0.3
12/31 10:20	80.5	↑0.2	満潮
12/31 10:30	80.5	0
12/31 10:40	80.4	↓-0.1
12/31 10:50	80.2	↓-0.2
12/31 11:00	79.8	↓-0.4
12/31 11:10	79.3	↓-0.5
12/31 11:20	78.7	↓-0.6
12/31 11:30	77.9	↓-0.8
12/31 11:40	77.0	↓-0.9
12/31 11:50	76.0	↓-1.0
12/31 12:00	74.9	↓-1.1
12/31 12:10	73.7	↓-1.2
12/31 12:20	72.4	↓-1.3
12/31 12:30	71.1	↓-1.3
12/31 12:40	69.6	↓-1.5
12/31 12:50	68.1	↓-1.5
12/31 13:00	66.5	↓-1.6
12/31 13:10	64.9	↓-1.6
12/31 13:20	63.2	↓-1.7
12/31 13:30	61.5	↓-1.7
12/31 13:40	59.8	↓-1.7
12/31 13:50	58.0	↓-1.8	最大潮位差
12/31 14:00	56.3	↓-1.7
12/31 14:10	54.6	↓-1.7
12/31 14:20	52.9	↓-1.7
12/31 14:30	51.3	↓-1.6
12/31 14:40	49.7	↓-1.6
12/31 14:50	48.2	↓-1.5
12/31 15:00	46.7	↓-1.5
12/31 15:10	45.3	↓-1.4
12/31 15:20	44.0	↓-1.3
12/31 15:30	42.8	↓-1.2
12/31 15:40	41.7	↓-1.1
12/31 15:50	40.6	↓-1.1
12/31 16:00	39.7	↓-0.9
12/31 16:10	38.8	↓-0.9
12/31 16:20	38.1	↓-0.7
12/31 16:30	37.4	↓-0.7
12/31 16:40	36.8	↓-0.6
12/31 16:50	36.3	↓-0.5
12/31 17:00	35.9	↓-0.4
12/31 17:10	35.6	↓-0.3
12/31 17:20	35.3	↓-0.3
12/31 17:30	35.2	↓-0.1
12/31 17:40	35.1	↓-0.1	干潮
12/31 17:50	35.1	0
12/31 18:00	35.1	0
12/31 18:10	35.3	↑0.2
12/31 18:20	35.5	↑0.2
12/31 18:30	35.9	↑0.4
12/31 18:40	36.3	↑0.4
12/31 18:50	36.8	↑0.5
12/31 19:00	37.5	↑0.7
12/31 19:10	38.2	↑0.7
12/31 19:20	39.0	↑0.8
12/31 19:30	39.9	↑0.9
12/31 19:40	40.8	↑0.9
12/31 19:50	41.9	↑1.1
12/31 20:00	43.0	↑1.1
12/31 20:10	44.2	↑1.2
12/31 20:20	45.4	↑1.2
12/31 20:30	46.7	↑1.3
12/31 20:40	48.0	↑1.3
12/31 20:50	49.3	↑1.3
12/31 21:00	50.6	↑1.3
12/31 21:10	51.9	↑1.3
12/31 21:20	53.1	↑1.2
12/31 21:30	54.3	↑1.2
12/31 21:40	55.5	↑1.2
12/31 21:50	56.6	↑1.1
12/31 22:00	57.6	↑1.0
12/31 22:10	58.5	↑0.9
12/31 22:20	59.4	↑0.9
12/31 22:30	60.1	↑0.7
12/31 22:40	60.8	↑0.7
12/31 22:50	61.3	↑0.5
12/31 23:00	61.8	↑0.5
12/31 23:10	62.1	↑0.3
12/31 23:20	62.4	↑0.3
12/31 23:30	62.5	↑0.1
12/31 23:40	62.6	↑0.1	満潮
12/31 23:50	62.5	↓-0.1