Anecdotally, from my weather station here on the Upper North Shore in Sydney, this has been the Year without a Summer. Mean temperatures for December, January and February were 18.6C, 21.5C and 21.6C, significantly lower than 2010/11 (21.7, 23.9, 24.1) and 2009/10 (22.9, 23.9, 23.4).