Thirty-year running average correlations between: (A) tree-ring index and cumulative annual precipitation (year, year+year₋₁) and tree-ring index and July and November precipitation; (B) tree-ring index and July and the previous year’s August (t − 1) mean temperature. Horizontal dotted lines are statistical critical values (α = 0.05) using Bonferroni correction (α′ = α / 31 = 0.0016). Pmm = annual precipitation; Tmean = mean temperature. Tmax = month maximum temperature. The x axis shows the first year of the 30-y period.