January - Bitter* February - Stout March – Bock* April - Wood Aged* May - IPA June - Lager July - Mead* August - Marzen / Oktoberfest September - Specialty/Experimental/Historical Beers* October - Hefeweizen* November - TBD December - TBD
http://www.abc.net.au/science/articles/2008/09/24/2373149.htm?site=science&topic=latest