Using maximum latewood density data from a network of coniferous trees, annually resolved series of average summer half-year (April?September) temperatures have been reconstructed for three regions of North America: Alaska and the Yukon (ALAYUK), the Mackenzie valley (MACKVA), and Quebec and Labrador (QUEBLA). The reconstructions primarily express temperature variability on interannual-to-decadal timescales and extend over the period from AD 1760. These reconstructions represent an extension of the mean climate history for these regions of over 100 years. The ALAYUK series shows relatively wann summers dominating the 1770s and 1820s. The 1760s, 1810s, 1860s, and 1890s were cold; 1810 was the coldest summer over the whole region, though [...]
