Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2023 | Cap Gris-Nez | 16 April | Cap Gris-Nez | 28 May | |||||
| 2022 | Cap Gris-Nez | 9 April | Cap Gris-Nez | 16 September | |||||
| 2021 | Cap Gris-Nez | 25 March | Cap Gris-Nez | 7 October | |||||
| 2020 | Cap Gris-Nez | 11 May | Cap Gris-Nez | 2 October | |||||
| 2019 | Cap Gris-Nez | 14 April | Cap Gris-Nez | 2 October | |||||
| 2018 | Cap Gris-Nez | 21 April | Cap Gris-Nez | 22 September | |||||
| 2017 | Cap Gris-Nez | 9 April | Cap Gris-Nez | 6 October | |||||
| 2016 | Cap Gris-Nez | 15 April | Cap Gris-Nez | 2 October | |||||
| 2015 | Cap Gris-Nez | 18 April | Cap Gris-Nez | 11 October | |||||
| 2014 | Cap Gris-Nez | 8 April | Cap Gris-Nez | 12 November | |||||
| 2013 | Cap Gris-Nez | 13 April | Cap Gris-Nez | 6 October | |||||
| 2012 | Cap Gris-Nez | 30 April | Cap Gris-Nez | 7 October | |||||
| 2011 | Cap Gris-Nez | 9 April | Cap Gris-Nez | 8 October | |||||
| 2010 | Cap Gris-Nez | 19 April | Cap Gris-Nez | 7 November | |||||
| 2009 | Cap Gris-Nez | 26 April | Cap Gris-Nez | 10 October | |||||
| 2008 | Cap Gris-Nez | 15 April | Cap Gris-Nez | 13 September | |||||
| 2007 | Cap Gris-Nez | 7 April | Cap Gris-Nez | 11 October | |||||
| 2006 | Cap Gris-Nez | 16 April | Cap Gris-Nez | 3 October | |||||
| 2005 | Cap Gris-Nez | 2 April | Cap Gris-Nez | 2 October | |||||
| 2004 | Cap Gris-Nez | 9 May | Cap Gris-Nez | 8 August | |||||
| 2003 | Cap Gris-Nez | 19 May | Cap Gris-Nez | 19 May | |||||
| 1987 | Cap Gris-Nez | 17 October | Cap Gris-Nez | 21 October | |||||
| 1978 | Cap Gris-Nez | 30 September | Cap Gris-Nez | 1 October | |||||
| 1963 | Cap Gris-Nez | 28 August | Cap Gris-Nez | 10 September | |||||
| 1962 | Cap Gris-Nez | 25 September | Cap Gris-Nez | 5 October | |||||
| 1961 | Cap Gris-Nez | 19 August | Cap Gris-Nez | 26 September | |||||
| 1960 | Cap Gris-Nez | 6 September | Cap Gris-Nez | 6 September | |||||
| 1958 | Cap Gris-Nez | 5 September | Cap Gris-Nez | 5 September |
