Annual tree growth is tightly regulated by climate. As air temperature increases, evaporative demand also increases, changing the dynamics of water availability in forest ecosystems. By correlating tree growth with precipitation, temperature, climatic water deficit, and vapor pressure deficit, we show that higher temperatures decrease tree growth across all spatial scales and regions. We use a novel dataset of Douglas-fir chronologies from 122 sites distributed throughout all mountain regions and a broad range of climate regimes in the western United States. By sampling throughout “clim
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