Climate variables recorded during the growing season 2007 within the treeline ecotone. (a) Mean daily air temperature. (b) Mean daily soil temperature. (c) Mean daily sum of precipitation (Mt. Patscherkofel summit) and mean relative air humidity averaged over the 3 sites within the treeline ecotone. In (a, b) study sites are denoted by thick and thin solid lines for timberline and treeline, respectively, and dotted lines for the krummholz-site.