Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2023 | Cap Gris-Nez | 26 January | Cap Gris-Nez | 13 May | |||||
| 2022 | Cap Gris-Nez | 12 March | Cap Gris-Nez | 18 December | |||||
| 2021 | Cap Gris-Nez | 31 January | Cap Gris-Nez | 5 December | |||||
| 2020 | Cap Gris-Nez | 4 January | Cap Gris-Nez | 25 December | |||||
| 2019 | Cap Gris-Nez | 1 March | Cap Gris-Nez | 27 December | |||||
| 2018 | Cap Gris-Nez | 9 March | Cap Gris-Nez | 14 December | |||||
| 2017 | Cap Gris-Nez | 12 March | Cap Gris-Nez | 16 December | |||||
| 2016 | Cap Gris-Nez | 15 January | Cap Gris-Nez | 27 November | |||||
| 2015 | Cap Gris-Nez | 1 March | Cap Gris-Nez | 25 November | |||||
| 2014 | Cap Gris-Nez | 4 March | Cap Gris-Nez | 11 December | |||||
| 2013 | Cap Gris-Nez | 6 January | Cap Gris-Nez | 3 December | |||||
| 2012 | Cap Gris-Nez | 7 January | Cap Gris-Nez | 2 December | |||||
| 2011 | Cap Gris-Nez | 16 January | Cap Gris-Nez | 20 December | |||||
| 2010 | Cap Gris-Nez | 2 January | Cap Gris-Nez | 26 December | |||||
| 2009 | Cap Gris-Nez | 8 February | Cap Gris-Nez | 14 December | |||||
| 2008 | Cap Gris-Nez | 6 January | Cap Gris-Nez | 10 December | |||||
| 2007 | Cap Gris-Nez | 21 February | Cap Gris-Nez | 30 December | |||||
| 2006 | Cap Gris-Nez | 7 January | Cap Gris-Nez | 17 December | |||||
| 2005 | Cap Gris-Nez | 30 January | Cap Gris-Nez | 18 December | |||||
| 2004 | Cap Gris-Nez | 20 December | Cap Gris-Nez | 20 December | |||||
| 2003 | Cap Gris-Nez | 10 May | Cap Gris-Nez | 10 May | |||||
| 1987 | Cap Gris-Nez | 18 October | Cap Gris-Nez | 20 October | |||||
| 1986 | Cap Gris-Nez | 19 October | Cap Gris-Nez | 19 October | |||||
| 1978 | Cap Gris-Nez | 1 October | Cap Gris-Nez | 1 October | |||||
| 1977 | Cap Gris-Nez | 1 October | Cap Gris-Nez | 1 October | |||||
| 1963 | Cap Gris-Nez | 20 August | Cap Gris-Nez | 23 September | |||||
| 1962 | Cap Gris-Nez | 22 September | Cap Gris-Nez | 21 October | |||||
| 1961 | Cap Gris-Nez | 24 August | Cap Gris-Nez | 30 September | |||||
| 1960 | Cap Gris-Nez | 12 September | Cap Gris-Nez | 12 September | |||||
| 1958 | Cap Gris-Nez | 4 September | Cap Gris-Nez | 9 September | |||||
| 1956 | Cap Gris-Nez | 6 October | Cap Gris-Nez | 6 October |
