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. 2021 Mar 5;97(3):542–548. doi: 10.1111/php.13401

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© 2021 Crown copyright. Photochemistry and Photobiology published by Wiley Periodicals LLC on behalf of American Society for Photobiology. This article is published with the permission of the Controller of HMSO and the Queen's Printer for Scotland.

This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Proportion of days when D₉₀ and D₉₉ could be reached within a single day and when D₉₀ could be reached within 1 h at the lowest (Camborne, 50.22 °N) and highest (Lerwick, 60.14 °N) latitude sites in the UK across the year.