Monthly mean water levels

Monthly mean water level in metres referred to chart datum.

Lakes		Superior	Huron	St.Clair	Erie	Ontario
2009	January	-0.06	0.01	0.55	0.55	0.56
	February	-0.10	0.01	0.55	0.57	0.62
	March	-0.12	0.09	0.66	0.82	0.72
	April	-0.07	0.20	0.74	0.92	0.92
	May	0.05	0.34	0.80	0.96	0.99
	June	0.10	0.41	0.85	0.95	0.96
	July	0.14	0.44	0.84	0.92	0.92
	August	0.19	0.44	0.80	0.85	0.83
	September	0.21	0.37	0.73	0.74	0.58
	October	0.16	0.29	0.59	0.63	0.40
	November	0.15	0.27	0.53	0.57	0.30
	December	0.10	0.22	0.47	0.52	0.28
2010	January	0.01	0.15	0.34	0.49	0.31
	February	-0.06	0.11	0.04	0.42	0.34
	March	-0.11	0.09	0.36	0.47	0.35
	April	-0.12	0.11	0.49	0.59	0.46
	May	-0.12	0.13	0.58	0.71	0.51
	June	-0.07	0.20	0.67	0.82	0.65
	July	-0.01	0.26	0.68	0.77	0.77
	August	0.0	0.24	0.65	0.69	0.70
	September	0.02	0.16	0.52	0.52	0.52
	October	-0.01	0.07	0.45	0.47	0.41
	November	-0.06	-0.04	0.32	0.38	0.30
	December	-0.13	-0.14	0.31	0.36	0.32
2011	January	-0.08	-0.19	0.08	0.33	0.29
	February	-0.27	-0.22	0.10	0.25	0.21
	March	-0.33	-0.19	0.27	0.53	0.41
	April	-0.29	-0.09	0.49	0.70	0.65
	May	-0.16	0.1	0.75	0.96	1.03
	June	-0.05	0.21	0.82	1.08	1.13
	July	0.05	0.26	0.81	0.98	0.94
	August	0.08	0.24	0.76	0.88	0.74
	September	0.03	0.13	0.24	0.80	0.56
	October	0.01	0.08	0.62	0.77	0.46
	November	-0.04	0.07	0.55	0.71	0.38
	December	-0.11	0.04	0.08	0.90	0.42
2012	January	-0.19	-0.01	0.62	0.88	0.60
	February	-0.26	-0.04	0.59	0.87	0.79
	March	-0.27	0.00	0.55	0.86	0.77
	April	-0.2	0.03	0.59	0.81	0.72
	May	-0.14	0.05	0.58	0.77	0.71
	June	0.00	0.07	0.58	0.72	0.70
	July	0.10	0.04	0.54	0.64	0.59
	August	0.07	-0.03	0.45	0.54	-0.34
	September	0.00	-0.14	0.35	0.45	0.30
	October	-0.07	-0.26	0.21	0.33	0.14
	November	-0.09	-0.33	0.19	0.35	0.09
	December	-0.14	-0.39	0.14	0.32	0.08
2013	January	-0.21	-0.43	0.12	0.32	0.18
	February	-0.24	-0.39	0.14	0.36	0.32
	March	-0.29	-0.37	0.24	0.42	0.38
	April	-0.28	-0.25	0.36	0.52	0.52
	May	-0.09	-0.07	0.44	0.60	0.68
	June	0.06	0.05	0.59	0.73	0.90
	July	0.17	0.09	0.85	0.94	0.66
	August	0.24	0.08	0.62	0.78	0.79
	September	0.28	0.04	0.56	0.66	0.59
	October	0.25	0.01	0.45	0.57	0.42
	November	0.20	-0.01	0.39	0.47	0.40
	December	0.15	-0.03	0.39	0.44	0.33
2014	January	0.09	-0.04	0.29	0.50	0.44
	February	0.04	-0.05	0.20	0.44	0.41
	March	0.04	-0.05	0.20	0.44	0.41
	April	0.07	0.06	0.56	0.70	0.63
	May	0.27	0.27	0.73	0.85	0.94
	June	0.40	0.38	0.81	0.90	0.97
	July	0.46	0.46	0.86	0.90	0.89
	August	0.47	0.48	0.86	0.87	0.76
	September	0.50	0.51	0.86	0.81	0.58
	October	0.51	0.54	0.78	0.75	0.39
	November	0.47	0.54	0.70	0.65	0.26
	December	0.40	0.53	0.73	0.67	0.26
2015	January	0.34	0.51	0.55	0.66	0.36
	February	0.27	0.50	0.34	0.53	0.30
	March	0.22	0.48	0.53	0.49	0.21
	April	0.24	0.52	0.77	0.71	0.42
	May	0.33	0.59	0.82	0.81	0.61
	June	0.43	0.68	1.02	1.02	0.81
	July	0.48	0.73	1.16	1.24	1.01
	August	0.48	0.72	1.08	1.12	0.91
	September	0.49	0.70	1.02	1.00	0.71
	October	0.40	0.58	0.86	0.84	0.47
	November	0.38	0.54	0.72	0.72	0.36
	December	0.39	0.55	0.72	0.67	0.27
2016	January	0.35	0.57	0.78	0.73	0.43
	February	0.29	0.56	0.77	0.77	0.62
	March	0.26	0.61	0.92	0.91	0.77
	April	0.28	0.77	1.09	1.10	0.91
	May	0.30	0.82	1.10	1.15	0.89
	June	0.41	0.84	1.11	1.11	0.82
	July	0.49	0.84	1.09	1.04	0.75
	August	0.50	0.82	1.06	0.96	0.64
	September	0.50	0.78	1.01	0.89	0.50
	October	0.48	0.69	0.92	0.83	0.34
	November	0.39	0.59	0.79	0.76	0.28
	December	0.34	0.51	0.72	0.67	0.26
2017	January	0.27	0.47	0.79	0.79	0.42
	February	0.23	0.48	0.82	0.90	0.62
	March	0.19	0.53	0.89	0.98	0.80
	April	0.21	0.66	1.07	1.14	1.15
	May	0.36	0.80	1.21	1.32	1.60
	June	0.47	0.88	1.24	1.33	1.61
	July	0.55	0.99	1.30	1.31	1.49
	August	0.58	1.00	1.26	1.20	1.23
	September	0.60	0.93	1.18	1.08	0.88
	October	0.61	0.87	1.06	0.96	0.66
	November	0.58	0.85	1.04	0.96	0.67
	December	0.52	0.79	0.96	0.90	0.57
2018	January	0.45	0.73	0.84	0.88	0.63
	February	0.38	0.74	0.92	0.94	0.70
	March	0.34	0.76	1.11	1.18	0.73
	April	0.27	0.79	1.20	1.27	0.81
	May	0.30	0.92	1.28	1.38	1.06
	June	0.36	0.98	1.32	1.39	1.02
	July	0.45	0.98	1.31	1.32	0.86
	August	0.45	0.95	1.24	1.22	0.71
	September	0.50	0.94	1.22	1.16	0.54
	October	0.57	0.90	1.12	1.07	0.42
	November	0.56	0.86	1.10	1.08	0.42
	December	0.47	0.83	1.07	1.10	0.51
2019	January	0.42	0.81	1.01	1.13	0.63
	February	0.38	0.83	1.01	1.11	0.77
	March	0.37	0.86	1.16	1.15	0.77
	April	0.41	0.96	1.30	1.33	0.95
	May	0.57	1.17	1.49	1.55	1.50
	June	0.64	1.32	1.59	1.64	1.71
	July	0.66	1.37	1.64	1.63	1.60
	August	0.66	1.32	1.56	1.52	1.33
	September	0.66	1.27	1.46	1.37	1.04
	October	0.68	1.29	1.37	1.24	0.84
	November	0.61	1.26	1.31	1.18	0.84
	December	0.54	1.25	1.28	1.18	0.80
2020	January	0.51	1.26	1.40	1.30	0.85
	February	0.44	1.25	1.39	1.40	0.92
	March	0.37	1.22	1.43	1.45	0.98
	April	0.42	1.30	1.51	1.55	1.12
	May	0.44	1.38	1.58	1.58	1.16
	June	0.50	1.45	1.62	1.60	1.09
	July	0.56	1.46	1.63	1.55	0.98
	August	0.61	1.42	1.57	1.43	0.85
	September	0.59	1.34	1.48	1.33	0.65
	October	0.56	1.25	1.34	1.22	0.50
	November	0.51	1.20	1.25	1.15	0.40
	December	0.43	1.14	1.23	1.15	0.42
2021	January	0.34	1.07	1.22	1.19	0.42
	February	0.26	0.99	1.07	1.07	0.33
	March	0.22	0.95	1.14	1.08	0.29
	April	0.28	0.95	1.14	1.13	0.42
	May	0.31	0.95	1.17	1.18	0.52
	June	0.35	0.93	1.22	1.21	0.51
	July	0.36	1.00	1.33	1.31	0.61
	August	0.34	1.02	1.31	1.29	0.65
	September	0.31	0.93	1.24	1.17	0.59
	October	0.29	0.91	1.21	1.17	0.58
	November	0.18	0.77	1.08	1.13	0.66
	December	0.11	0.69	1.02	1.08	0.67
2022	January	0.04	0.60	0.92	1.04	0.66
	February	-0.03	0.54	0.67	0.93	0.68
	March	-0.05	0.53	0.92	1.03	0.79
	April	0.04	0.66	1.00	1.09	0.93
	May	0.24	0.75	1.10	1.17	0.97
	June	0.37	0.80	1.15	1.18	0.93
	July	0.42	0.81	1.13	1.12	0.75
	August	0.45	0.79	1.10	1.05	0.54
	September	0.45	0.71	1.01	0.96	0.35
	October	0.40	0.60	0.85	0.82	0.21
	November	0.40	0.55	0.74	0.75	0.20
	December	0.37	0.46	0.72	0.70	0.27
2023	January	0.32	0.44	0.74	0.78	0.45
	February	0.27	0.41	0.77	0.86	0.56
	March	0.23	0.43	0.90	1.04	0.68
	April	0.28	0.56	1.02	1.14	0.93
	May	0.47	0.69	1.05	1.15	1.16
	June	0.48	0.68	1.06	1.10	1.04
	July	0.48	0.70	1.10	1.10	0.94
	August	0.47	0.70	1.12	1.09	0.86
	September	0.43	0.64	1.04	1.04	0.68
	October	0.35	0.56	0.88	0.89	0.46
	November	0.26	0.51	0.77	0.79	0.29
	December	0.17	0.44	0.73	0.76	0.29
2024	January	0.12	0.42	0.86	0.81	0.40
	February	0.06	0.40	0.81	0.93	0.50
	March	0.01	0.39	0.80	0.92	0.53
	April	0.04	0.46	0.92	1.06	0.67
	May	0.13	0.58	1.01	1.12	0.76
	June	0.24	0.66	1.06	1.12	0.74
	July	0.32	0.73	1.13	1.13	0.78
	August	0.28	0.68	1.08	1.06	0.72
	September	0.25	0.57	0.96	0.94	0.58
	October	0.14	0.42	0.80	0.81	0.38
	November	0.10	0.33	0.64	0.69	0.21
	December	0.05	0.23	0.56	0.62	0.22
2025	January	-0.02	0.18	0.59	0.65	0.28
	February	-0.10	0.12	0.28	0.57	0.25
	March	-0.12	0.14	0.56	0.62	0.35
	April	-0.07	0.28	0.75	0.85	0.59
	May	0.08	0.37	0.83	0.96	0.79
	June	0.12	0.42	0.88	0.98	0.89
	July	0.23	0.48	0.91	0.96	0.83
	August	0.29	0.46	0.86	0.86	0.68
	September	0.29	0.35	0.74	0.71	0.53
	October	0.24	0.26	0.62	0.61	0.37
	November	0.16	0.13	0.46	0.49	0.29
	December	0.07	0.03	0.37	0.41	0.23

Elevation of chart datum in metres referred to International Great Lakes Datum 1985.

Lake		Superior	Huron	St. Clair	Erie	Ontario
Chart Datum	IGLD 1985	183.2	176.0	174.4	173.5	74.2

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Monthly mean water levels

Monthly mean water levels

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