Table 5: Comparison of East River (ER), Valles Caldera (VC), and Niwot Ridge (NR) ET both over the summer (June-August, mm) as well as annual ET (mm/year), precipitation cumulative for the water year (mm), and average summer temperature (K). Annual 2017 ET is measured from April 2017 when the tower was installed through the end of the water year (September 30, 2017).