Aono, Y. and Saito, S. 2010. Clarifying springtime temperature reconstructions of the medieval period by gap-filling the cherry blossom phenological data series at Kyoto, Japan. International Journal of Biometeorology 54: 211-219.
Japanese scientists working with historical data and documents determine that the extended Medieval Warming had temperatures exceeding current temps by at least one-half degree. Their research also confirms that the Medieval Warming was global in nature, not just a northern Europe climate condition as speculated by IPCC Climategate scientists. Thanks to Marc Morano and the Idsos.