Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2023 | Cap Gris-Nez | 3 April | Cap Gris-Nez | 14 May | |||||
| 2022 | Cap Gris-Nez | 27 March | Cap Gris-Nez | 12 September | |||||
| 2021 | Cap Gris-Nez | 30 March | Cap Gris-Nez | 10 August | |||||
| 2020 | Cap Gris-Nez | 12 May | Cap Gris-Nez | 26 July | |||||
| 2019 | Cap Gris-Nez | 31 March | Cap Gris-Nez | 26 August | |||||
| 2018 | Cap Gris-Nez | 11 April | Cap Gris-Nez | 16 September | |||||
| 2017 | Cap Gris-Nez | 25 March | Cap Gris-Nez | 7 September | |||||
| 2016 | Cap Gris-Nez | 16 April | Cap Gris-Nez | 3 May | |||||
| 2015 | Cap Gris-Nez | 18 April | Cap Gris-Nez | 1 October | |||||
| 2014 | Cap Gris-Nez | 2 April | Cap Gris-Nez | 11 October | |||||
| 2013 | Cap Gris-Nez | 17 April | Cap Gris-Nez | 19 August | |||||
| 2012 | Cap Gris-Nez | 28 April | Cap Gris-Nez | 16 August | |||||
| 2011 | Cap Gris-Nez | 6 April | Cap Gris-Nez | 25 September | |||||
| 2010 | Cap Gris-Nez | 18 March | Cap Gris-Nez | 12 August | |||||
| 2009 | Cap Gris-Nez | 18 April | Cap Gris-Nez | 29 August | |||||
| 2008 | Cap Gris-Nez | 15 March | Cap Gris-Nez | 25 August | |||||
| 2007 | Cap Gris-Nez | 25 March | Cap Gris-Nez | 10 September | |||||
| 2006 | Cap Gris-Nez | 1 April | Cap Gris-Nez | 20 August | |||||
| 2005 | Cap Gris-Nez | 26 March | Cap Gris-Nez | 15 September | |||||
| 2004 | Cap Gris-Nez | 3 April | Cap Gris-Nez | 14 May | |||||
| 2003 | Cap Gris-Nez | 10 May | Cap Gris-Nez | 10 May | |||||
| 1987 | Cap Gris-Nez | 19 October | Cap Gris-Nez | 19 October | |||||
| 1959 | Cap Gris-Nez | 20 September | Cap Gris-Nez | 20 September |
