Swithun (Swithin) of Winchester - Capsule summary of his life. Popular folklore has it that if it rains on St. Swithin's Day (15 July), it will rain for 40 days. - http://www.saintpatrickdc.org/ss/0715.htm#swit
St. Swithun - Some legendary material about this ninth-century bishop. - http://www.britannia.com/bios/swithun.html
Swithin - Famous as a missionary and for his knowledge of Scripture. - http://www2.evansville.edu/ecoleweb/glossary/swithin.html
St. Swithin - Or Swithun. Bishop of Winchester, d. 862. Short entry in the Catholic Encyclopedia. - http://www.newadvent.org/cathen/14357c.htm