During the grueling journey, Perham said he tackled 50 foot (15 meter) waves, gale force winds and technical problems.
"It's definitely the hardest part of the trip being on your own because there is no one there to help you, and you do miss the physical contact," he told the BBC.
Perham's team says he finished the trip in a 50-foot (15-meter) racing yacht Totallymoney.com at approximately 9.55 a.m. The teen set off in November 2008.
Perham is a few months younger than Zac Sunderland, a 17-year-old from Thousand Oaks, California. He had grabbed the youngest solo crown in July when he completed a similar trip in 13 months.
To mark Thursday's achievement, the Guinness Book of World Records created a new category for Perham -- youngest sailor to circumnavigate the globe unsupported.
Guinness' closest record to Perham's -- youngest sailor to circumnavigate the globe unsupported and without stopping -- is now held by Jesse Martin of Melbourne, Australia. He completed the trip when he was 18 years and 104 days old.
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