Select averages/extreme

2003 Jun Jul Aug Sep Oct Nov Dec   2004 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec   2005 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec   2006 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec   2007 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec   2008 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec   2009 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec   2010 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec