Water-vapor measures, Mt. Lemmon area

Daytime atmospheric water-vapor measures were continued for Mt. Lemmon, the Catalina Observatory, and Tucson. As before (LPL Comm. No. 158), the three sets are closely related in terms of their altitude differences, with the average empirically-determined scale-height value, 2.3 km. During the winter and spring of 1971 observations were made for more than 90% of the days. The measures are listed in tables and for comparison, the 1969-70 data published in LPL Communication No. 158 are given. The averages for the stations are also shown.