Relative humidity was monitored in winter and summer. In the winter, the mean daily low and high RH did not differ significantly between the two window treatments (Table 2). Summer microclimate monitoring included both treatment windows as well as nearby, un-manipulated site reference measurements. There was no significant difference in mean daily high RH among the two treatment windows or site reference sample sites (Table 2). Treatment did have a significant effect on summer mean daily low RH (Table 2), however, the post-hoc test found no significant differences in summer mean daily low RH between UV-filtered and UV-transmitted. Summer daily low RH was significantly higher in the site reference plot than in the UV-filtered window (adjusted = 0.033).