Regression of regional atmospheric pressure onto summer phenology changes. Regression of regionally-averaged, normalized, quarterly spring (April–June) (top row) and summer (July–September) (bottom row) 700 hPa height onto the three phenology metrics defining the summer warm period at each grid location in the study area. The units of the regression are in days. The inserts in each figure provide the spatial pattern of the associated p value of the coefficient. DOI: https://doi.org/10.1525/elementa.240.f12