Released the first Tuesday in the September that precedes the year printed on its cover, The Old Farmer's Almanac has been published continuously since 1792, making it the oldest continuously published periodical in North America.
The first Old Farmer's Almanac (then known as The Farmer's Almanac) was edited by Robert B. Thomas, the publication's founder.
There were many competing almanacs in the 18th century, but Thomas's upstart was a success. In its second year, distribution tripled to 9,000. The initial cost of the book was six pence (about four cents).
To calculate the Almanac's weather predictions, Thomas studied solar activity, astronomy cycles and weather patterns and used his research to develop a secret forecasting formula, which is still in use today. Other than the Almanac's prognosticators, few people have seen the formula. It is kept in a black tin box at the Almanac offices in Dublin, New Hampshire.
Thomas also started drilling a hole through the Almanac so that subscribers could hang it from a nail or a string.
Thomas served as editor until his death on May 19, 1846. As its editor for more than 50 years, Thomas established The Old Farmer's Almanac as America's "most enduring" almanac by outlasting the competition.
According to wikipedia