Table 2 Dates for ice arch formation and break down from 1979 to 2019. Arch days indicate the number of days that Nares Strait was continuously blocked by ice arches.

Sea-son	N. Arch Form	S. Arch Form	Break-down	Arch Days	Sea-son	N. Arch Form	S. Arch Form	Break-down	Arch Days
2019	16 Feb	—	20 Mar	32	1999	—	25 Jan	10 Jul	166
2018	—	04 Mar	30 Jun	118	1998	09 Jan	07 Mar	22 Jun	164
2017	23 Jan	—	11 May	108	1997	04 Mar	13 Mar	22 Jul	140
2016	—	05 Dec 15	07 Jul	215	1996	—	01 Feb	28 Jul	178
2015	—	14 Feb	16 Jul	152	1995	—	16 Mar	19 May	64
2014	09 Dec 13	15 Jan	10 Jul	213	1994	23 Dec 93	25 Mar	14 Jun	173
2013	—	08 Nov 12	10 Jul	243	1993	—	27 Jan	06 Feb	10
2012	—	06 Dec 11	29 Jun	206	1992	—	05 Dec 91	21 Jul	229
2011		31 Jan	18 Jun	138	1991	—	05 Apr	12 Jul	98
2010	15 Mar	—	16 Apr	32	1990	—	20 Mar	3 May	44
2009	09 Jan	—	12 Jul	184	1989	—	09 Dec	27 Jul	230
2008	—	01 Apr	07 Jun	67	1988	06 Dec 87	15 Dec 87	13 Jul	220
2007	—	—	—	0	1987	—	20 Jan	16 Jul	177
2006	—	08 Feb	30 Jun	142	1986	—	24 Dec 85	12 Jul	200
2005	03 Dec 04	06 Dec 04	15 Jul	224	1985	—	01 Dec 84	12 Jul	223
2004	14 Feb	09 Mar	02 Jul	139	1984	14 Nov 83	15 Feb	21 Jul	250
2003	—	25 Feb	01 Jul	126	1983	27 Jan	01 Feb	11 Jul	165
2002	—	10 Dec 01	01 Jul	203	1982	—	06 Apr	05 Jul	90
2001	03 Jan	11 Jan	12 Jul	190	1981	20 Nov 80	04 Dec 80	28 Jul	250
2000	14 Oct 99	26 Oct 99	11 Jul	271	1980	—	11 Nov 79	17 Sep	310
Note: ± 2 days for dates, ± 4 for arch days					1979*	05 Nov 78	05 Nov 78 04 Jan	02 Aug	270+
Average 1979 to 2019 Standard Deviation (Days)						01 Jan 41.9	20 Jan 47.7	28 Jun 38.8	161 76.7

*For the 1979 season an initial southern ice arch was observed for 05 Nov 1978. Earlier TIROS-N imagery is not available to determine the date the ice arch formed. This initial ice arch broke up on 28 Nov 1978, but Nares Strait remained blocked by a northern ice arch. A second southern ice arch consolidated on 04 Jan 1979.

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