Delichon urbica – GWENNOL Y BONDO – Breeding summer visitor and passage migrant. Not recorded in January and December
Earlier records are summarised in House Martin 1994
| Year | First sighting | Last sighting | Notes |
| 1993 | 15 March | 25 October | |
| 1994 | 29 March | 9 October | |
| 1995 | 19 March | 15 October | |
| 1996 | 13 March | 4 November | |
| 1997 | 21 March | 5 November | Over 250 pairs estimated along sea-cliffs around Castlemartin area |
| 1998 | 21 March | 25 October | |
| 1999 | 1 April | 17 October | |
| 2000 | 21 March | 24 October | |
| 2001 | 21 March | 22 October | |
| 2002 | 24 March | 28 October | One Hakin 29 January – first January record for Pembrokeshire |
| 2003 | 4 April | 11 October | |
| 2004 | 8 April | 30 October | |
| 2005 | 11 April | 15 October | |
| 2006 | 1 April | 13 October | |
| 2007 | 7 April | 18 November | |
| 2008 | 3 April | 26 October | |
| 2009 | 18 March | 19 October | |
| 2010 | 29 March | 11 October | |
| 2011 | 1 April | 3 October | |
| 2012 | 2 April | 13 October | |
| 2013 | 6 March | 5 October | First breeding on Ramsey in an artificial box |
| 2014 | 8 April | 17 November | Single pair nested on Ramsey |
| 2015 | 4 April | 20 October | |
| 2016 | 25 March | 28 October | Winter record of a single bird at Tenby 29-31 January |
| 2017 | 12 March | 13 November | |
| 2018 | 19 March | 3 October | |
| 2019 | 18 March | 9 October | |
| 2020 | 21 March | 26 October |
