Microclimate
Temperature and relative humidity were measured in winter and summer in order to test for the effects of UV-filtering and UV-transmitting windows on microclimate. Neither the winter mean daily low temperature nor the mean daily high temperature significantly differed between the UV-filtering and UV-transmitting windows (Table 1). Similarly, the winter mean daily low RH did not differ significantly between the two window treatments (Table 1). However, mean daily high RH was significantly higher under UV-filtering windows (Table 1).
Summer microclimate monitoring included both treatment windows as well as nearby, un-manipulated site reference measurements. There was no significant difference in mean daily low temperatures or mean daily high temperatures among the two treatment windows or site reference plots (Table 1). Summer mean daily high RH was higher in the site reference plot (Table 1), although there were no significant differences across any of the treatment groups. Field treatment did, however, have a significant effect on mean daily low RH (highest in site reference plots; P = 0.032, Table 1).