First + Last Dates of Migrant Birds (1 Viewer)

Since starting the Commic Tern thread on the Q&A forum, this lead me to thinking about first arrival and last departure dates of migrant bird species in the UK. Since this is often an important means of measuring annual phenological events and to some degree out of personal interest, I was wondering if anyone would happen to have any sources or links to such data. Any help much appreciated,

Many thanks,

Many county bird reports include first-arrival and last-departure dates for regular migrants, but I don't know whether these data are collated anywhere at national level.

eg, Avon Bird Report and Somerset Birds tabulate both dates annually. Avon Bird Report also gives the forty-year average for both dates, whilst Somerset Birds gives the ten-year average for first-arrival date only.

PS. BTO: Bird migration timeline.

Thanks Richard for the link :t: I'll keep looking for further records.

Cheshire also uses a 10 year average.

CB