The Farmers’ Almanac says people from the Great Lakes to northern New England should get out their long johns and dust off their snow shovels because it’s going to be cold and snowy this winter. The 196-year-old publication’s new edition, which goes on sale this week, bases its forecast on secret formula and a mysterious meteorologist, both of which it goes to great lengths to protect. In an election year, the almanac dubs its forecast “a nation divided” because there’s a dividing line where winter returns for much of the east, with milder weather west of the Great Lakes. The Maine-based Farmers’ Almanac is not to be confused with the New Hampshire-based Old Farmer’s Almanac. Both issue annual forecasts, with the Old Farmer’s Almanac scheduled for next month.