Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2023 | Cap Gris-Nez | 3 March | Cap Gris-Nez | 28 May | |||||
| 2022 | Cap Gris-Nez | 5 March | Cap Gris-Nez | 18 December | |||||
| 2021 | Cap Gris-Nez | 9 February | Cap Gris-Nez | 27 December | |||||
| 2020 | Cap Gris-Nez | 12 May | Cap Gris-Nez | 27 September | |||||
| 2019 | Cap Gris-Nez | 1 March | Cap Gris-Nez | 6 October | |||||
| 2018 | Cap Gris-Nez | 17 March | Cap Gris-Nez | 1 October | |||||
| 2017 | Cap Gris-Nez | 23 March | Cap Gris-Nez | 28 October | |||||
| 2016 | Cap Gris-Nez | 15 March | Cap Gris-Nez | 26 December | |||||
| 2015 | Cap Gris-Nez | 16 March | Cap Gris-Nez | 21 November | |||||
| 2014 | Cap Gris-Nez | 15 March | Cap Gris-Nez | 17 December | |||||
| 2013 | Cap Gris-Nez | 6 January | Cap Gris-Nez | 20 November | |||||
| 2012 | Cap Gris-Nez | 24 March | Cap Gris-Nez | 7 October | |||||
| 2011 | Cap Gris-Nez | 21 February | Cap Gris-Nez | 4 December | |||||
| 2010 | Cap Gris-Nez | 14 January | Cap Gris-Nez | 17 November | |||||
| 2009 | Cap Gris-Nez | 22 March | Cap Gris-Nez | 30 November | |||||
| 2008 | Cap Gris-Nez | 3 April | Cap Gris-Nez | 22 November | |||||
| 2007 | Cap Gris-Nez | 25 March | Cap Gris-Nez | 9 December | |||||
| 2006 | Cap Gris-Nez | 11 March | Cap Gris-Nez | 29 November | |||||
| 2005 | Cap Gris-Nez | 17 April | Cap Gris-Nez | 26 November | |||||
| 2004 | Cap Gris-Nez | 16 May | Cap Gris-Nez | 16 May | |||||
| 1987 | Cap Gris-Nez | 17 October | Cap Gris-Nez | 20 October | |||||
| 1986 | Cap Gris-Nez | 21 October | Cap Gris-Nez | 21 October | |||||
| 1977 | Cap Gris-Nez | 1 October | Cap Gris-Nez | 2 October | |||||
| 1962 | Cap Gris-Nez | 29 September | Cap Gris-Nez | 5 October | |||||
| 1961 | Cap Gris-Nez | 29 September | Cap Gris-Nez | 30 September | |||||
| 1958 | Cap Gris-Nez | 14 September | Cap Gris-Nez | 14 September | |||||
| 1956 | Cap Gris-Nez | 24 September | Cap Gris-Nez | 24 September |
