Ales are brewed with “top-fermenting” yeasts at closer to room temperature than Lagers, generally 17-24C (although generic ale yeast can handle up to 30C). Usually ferment ales for 2-3 weeks at the lower temperatures (18-20 degrees), or 7-10 days in warmer weather (26-28 degrees). Ales encompass the broadest range of beer styles including bitters, pale ales, porters, stouts, barley wines, trappist, lambic, and alt. The British Isles are famous for their ales and it is a popular style with homebrewers.