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Data

Monthly sea ice extent in the Antarctic

What you should know about this indicator

  • Temperature anomalies are given in degrees Celsius relative to the average temperature over the period 1961-1990.
  • Temperature anomalies are available for the Northern Hemisphere and the Southern Hemisphere.
  • The global mean is calculated by averaging anomalies for northern and southern hemispheres.
Source
Met Office Hadley Centre (2025) – processed by Our World in Data
Last updated
January 21, 2025
Next expected update
April 2025
Date range
1850–2024
Unit
degrees Celsius

Sources and processing

This data is based on the following sources

The HadCRUT5 near surface temperature data set is produced by blending data from the CRUTEM5 surface air temperature dataset and the HadSST4 sea-surface temperature dataset.

Temperature anomalies are based on the HadCRUT5 near-surface temperature dataset as published by the Met Office Hadley Centre.

Retrieved on
January 21, 2025
Retrieved from
https://www.metoffice.gov.uk/hadobs/hadcrut5/
Citation
This is the citation of the original data obtained from the source, prior to any processing or adaptation by Our World in Data. To cite data downloaded from this page, please use the suggested citation given in Reuse This Work below.
Morice, C.P., J.J. Kennedy, N.A. Rayner, J.P. Winn, E. Hogan, R.E. Killick, R.J.H. Dunn, T.J. Osborn, P.D. Jones and I.R. Simpson (in press) An updated assessment of near-surface temperature change from 1850: the HadCRUT5 dataset. Journal of Geophysical Research (Atmospheres) doi:10.1029/2019JD032361 (supporting information).

How we process data at Our World in Data

All data and visualizations on Our World in Data rely on data sourced from one or several original data providers. Preparing this original data involves several processing steps. Depending on the data, this can include standardizing country names and world region definitions, converting units, calculating derived indicators such as per capita measures, as well as adding or adapting metadata such as the name or the description given to an indicator.

At the link below you can find a detailed description of the structure of our data pipeline, including links to all the code used to prepare data across Our World in Data.

Read about our data pipeline

Reuse this work

  • All data produced by third-party providers and made available by Our World in Data are subject to the license terms from the original providers. Our work would not be possible without the data providers we rely on, so we ask you to always cite them appropriately (see below). This is crucial to allow data providers to continue doing their work, enhancing, maintaining and updating valuable data.
  • All data, visualizations, and code produced by Our World in Data are completely open access under the Creative Commons BY license. You have the permission to use, distribute, and reproduce these in any medium, provided the source and authors are credited.

Citations

How to cite this page

To cite this page overall, including any descriptions, FAQs or explanations of the data authored by Our World in Data, please use the following citation:

“Data Page: Monthly sea ice extent in the Antarctic”. Our World in Data (2025). Data adapted from Met Office Hadley Centre. Retrieved from https://era5-cont.owid.pages.dev/grapher/monthly-sea-ice-extent-in-the-antarctic [online resource]
How to cite this data

In-line citationIf you have limited space (e.g. in data visualizations), you can use this abbreviated in-line citation:

Met Office Hadley Centre (2025) – processed by Our World in Data

Full citation

Met Office Hadley Centre (2025) – processed by Our World in Data. “Monthly sea ice extent in the Antarctic” [dataset]. Met Office Hadley Centre, “HadCRUT5 HadCRUT.5.0.2.0” [original data]. Retrieved March 13, 2025 from https://era5-cont.owid.pages.dev/grapher/monthly-sea-ice-extent-in-the-antarctic