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. 2013 Jan 25;8(1):e55144. doi: 10.1371/journal.pone.0055144

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© 2013 Otegui et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Year rank is from 1750 to 2011. Solid line represents average number of records and dotted lines represent standard error of the mean. Radii mark the first day of each month. Day of year is numbered 1–366; non-leap years lack day 60. There is a high record bias towards spring/summer.