Southern Hemisphere monthly ice extent 2025| ��ƽ��

Average monthly sea ice extent in the Southern Hemisphere from January 1980 to September 2025 (in million square kilometers)

Characteristic	1980	1985	1990	1995	2000	2005	2010	2015	2020	2021	2022	2023	2024	2025
Dec	10.16	11.35	9.95	10.62	9.91	9.68	11.27	10.66	10.58	9.25	8.84	8.67	9.49	-
Nov	16.13	16.14	15.47	15.63	15.76	16.32	16.76	16.18	16.23	15.04	15.16	14.27	14.19	-
Oct	18.57	18.2	17.95	18.03	18.13	18.48	18.65	18.41	18.49	17.69	17.47	16.2	16.55	-
Sep	18.82	18.7	18.19	18.37	18.89	18.81	18.8	18.44	18.84	18.51	18.06	16.8	17.05	17.64
Aug	17.81	17.63	17.57	17.78	18.21	17.92	18.61	17.75	17.76	18.19	17.05	15.5	16.34	16.5
Jul	15.56	15.72	15.57	15.74	16.1	16.16	16.92	16.78	15.72	16.45	14.99	13.49	14.11	14.67
Jun	12.49	13.43	13.08	13.29	13.89	13.29	14.41	14.48	13.28	13.54	12.22	11.02	11.76	12.11
May	8.86	10.15	9.72	10.42	10.92	10.29	10.64	11.72	9.87	10.4	9.42	8.36	9.27	9.27
Apr	5.41	6.49	7	7.27	7.13	7.03	6.72	8.37	6.66	7.13	5.95	5.49	6.19	6.17
Mar	3.3	3.72	3.97	4.63	4.09	4.08	3.85	4.96	4	4.48	2.86	2.8	3.18	3
Feb	2.82	2.84	3.04	3.56	2.91	2.97	3.11	3.8	2.92	2.89	2.21	1.91	2.14	2.22
Jan	4.56	4.46	4.87	5.64	4.75	4.75	4.96	6.85	4.6	4.78	3.94	3.23	3.96	4.69

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Release date

October 2025

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Region

Worldwide

Survey time period

January 1980 to September 2025

Supplementary notes

The figures were obtained from the following source:
Fetterer, F., K. Knowles, W. N. Meier, M. Savoie, and A. K. Windnagel. 2017, updated daily. Sea Ice Index, Version 3. [G02135]. Boulder, Colorado USA. NSIDC: National Snow and Ice Data Center. doi: https://doi.org/10.7265/N5K072F8. [August 21, 2023].

Citation formats

As of September 2025, the Southern Hemisphere's sea ice reached an extent of 17.64 million square kilometers. In 1980, the sea ice extent was 18.82 million square kilometers during the same month. Sea ice plays a crucial role in regulating the climate in terms of heat regulation and maintaining salinity in the polar oceans.