31 (水)	06:11	11:26	16:48	23:47
	126cm	76cm	130cm	11cm
中潮 出 06:49 入 16:33 出 19:01 入 08:02

日立（茨城）2031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	9.2	↑1.4
12/31 00:10	10.9	↑1.7
12/31 00:20	13.1	↑2.2
12/31 00:30	15.5	↑2.4
12/31 00:40	18.3	↑2.8
12/31 00:50	21.4	↑3.1
12/31 01:00	24.7	↑3.3
12/31 01:10	28.4	↑3.7
12/31 01:20	32.2	↑3.8
12/31 01:30	36.3	↑4.1
12/31 01:40	40.5	↑4.2
12/31 01:50	44.9	↑4.4
12/31 02:00	49.4	↑4.5
12/31 02:10	54.0	↑4.6
12/31 02:20	58.6	↑4.6
12/31 02:30	63.2	↑4.6
12/31 02:40	67.8	↑4.6
12/31 02:50	72.4	↑4.6
12/31 03:00	76.9	↑4.5
12/31 03:10	81.3	↑4.4
12/31 03:20	85.6	↑4.3
12/31 03:30	89.7	↑4.1
12/31 03:40	93.7	↑4.0
12/31 03:50	97.5	↑3.8
12/31 04:00	101.1	↑3.6
12/31 04:10	104.5	↑3.4
12/31 04:20	107.7	↑3.2
12/31 04:30	110.6	↑2.9
12/31 04:40	113.3	↑2.7
12/31 04:50	115.8	↑2.5
12/31 05:00	117.9	↑2.1
12/31 05:10	119.8	↑1.9
12/31 05:20	121.4	↑1.6
12/31 05:30	122.8	↑1.4
12/31 05:40	123.8	↑1.0
12/31 05:50	124.5	↑0.7
12/31 06:00	125.0	↑0.5
12/31 06:10	125.1	↑0.1	満潮
12/31 06:20	125.0	↓-0.1
12/31 06:30	124.5	↓-0.5
12/31 06:40	123.8	↓-0.7
12/31 06:50	122.8	↓-1.0
12/31 07:00	121.6	↓-1.2
12/31 07:10	120.1	↓-1.5
12/31 07:20	118.4	↓-1.7
12/31 07:30	116.5	↓-1.9
12/31 07:40	114.5	↓-2.0
12/31 07:50	112.3	↓-2.2
12/31 08:00	110.0	↓-2.3
12/31 08:10	107.6	↓-2.4
12/31 08:20	105.2	↓-2.4
12/31 08:30	102.7	↓-2.5
12/31 08:40	100.2	↓-2.5
12/31 08:50	97.8	↓-2.4
12/31 09:00	95.4	↓-2.4
12/31 09:10	93.0	↓-2.4
12/31 09:20	90.7	↓-2.3
12/31 09:30	88.6	↓-2.1
12/31 09:40	86.5	↓-2.1
12/31 09:50	84.6	↓-1.9
12/31 10:00	82.9	↓-1.7
12/31 10:10	81.3	↓-1.6
12/31 10:20	79.8	↓-1.5
12/31 10:30	78.6	↓-1.2
12/31 10:40	77.6	↓-1.0
12/31 10:50	76.7	↓-0.9
12/31 11:00	76.1	↓-0.6
12/31 11:10	75.6	↓-0.5
12/31 11:20	75.4	↓-0.2	干潮
12/31 11:30	75.4	0
12/31 11:40	75.7	↑0.3
12/31 11:50	76.1	↑0.4
12/31 12:00	76.8	↑0.7
12/31 12:10	77.8	↑1.0
12/31 12:20	78.9	↑1.1
12/31 12:30	80.3	↑1.4
12/31 12:40	81.9	↑1.6
12/31 12:50	83.7	↑1.8
12/31 13:00	85.7	↑2.0
12/31 13:10	87.8	↑2.1
12/31 13:20	90.1	↑2.3
12/31 13:30	92.5	↑2.4
12/31 13:40	95.1	↑2.6
12/31 13:50	97.7	↑2.6
12/31 14:00	100.4	↑2.7
12/31 14:10	103.1	↑2.7
12/31 14:20	105.8	↑2.7
12/31 14:30	108.5	↑2.7
12/31 14:40	111.1	↑2.6
12/31 14:50	113.6	↑2.5
12/31 15:00	116.1	↑2.5
12/31 15:10	118.3	↑2.2
12/31 15:20	120.5	↑2.2
12/31 15:30	122.4	↑1.9
12/31 15:40	124.2	↑1.8
12/31 15:50	125.7	↑1.5
12/31 16:00	127.1	↑1.4
12/31 16:10	128.2	↑1.1
12/31 16:20	129.0	↑0.8
12/31 16:30	129.6	↑0.6
12/31 16:40	129.9	↑0.3	満潮
12/31 16:50	129.9	0
12/31 17:00	129.7	↓-0.2
12/31 17:10	129.2	↓-0.5
12/31 17:20	128.4	↓-0.8
12/31 17:30	127.3	↓-1.1
12/31 17:40	125.9	↓-1.4
12/31 17:50	124.2	↓-1.7
12/31 18:00	122.3	↓-1.9
12/31 18:10	120.0	↓-2.3
12/31 18:20	117.5	↓-2.5
12/31 18:30	114.7	↓-2.8
12/31 18:40	111.6	↓-3.1
12/31 18:50	108.3	↓-3.3
12/31 19:00	104.8	↓-3.5
12/31 19:10	101.0	↓-3.8
12/31 19:20	97.0	↓-4.0
12/31 19:30	92.8	↓-4.2
12/31 19:40	88.5	↓-4.3
12/31 19:50	84.1	↓-4.4
12/31 20:00	79.6	↓-4.5
12/31 20:10	75.0	↓-4.6
12/31 20:20	70.3	↓-4.7	最大潮位差
12/31 20:30	65.7	↓-4.6
12/31 20:40	61.1	↓-4.6
12/31 20:50	56.5	↓-4.6
12/31 21:00	52.0	↓-4.5
12/31 21:10	47.7	↓-4.3
12/31 21:20	43.5	↓-4.2
12/31 21:30	39.4	↓-4.1
12/31 21:40	35.6	↓-3.8
12/31 21:50	32.0	↓-3.6
12/31 22:00	28.5	↓-3.5
12/31 22:10	25.4	↓-3.1
12/31 22:20	22.5	↓-2.9
12/31 22:30	19.9	↓-2.6
12/31 22:40	17.6	↓-2.3
12/31 22:50	15.5	↓-2.1
12/31 23:00	13.8	↓-1.7
12/31 23:10	12.4	↓-1.4
12/31 23:20	11.4	↓-1.0
12/31 23:30	10.7	↓-0.7
12/31 23:40	10.3	↓-0.4	干潮
12/31 23:50	10.2	↓-0.1