the Christian church festival of St Swithin, held on 15 July. According to traditional belief in Britain, if it rains on this day it will continue to rain for 40 days afterwards.
ST SWITHIN’S DAY
Meaning of ST SWITHIN’S DAY in English
Oxford guide to British and American culture English vocabulary. Руководство по британской и американской культуре, Оксфордский английский словарь. 2005