These data were cited in the following: Marr, J.W. 1967. Data on mountain environments. I. Front Range, Colorado, sixteen sites, 1952-1953. University of Colorado Studies, Series in Biology 27, 110 pp. Marr, J.W., A.W. Johnson, W.S. Osburn, and O.A. Knorr. 1968. Data on mountain environments. II. Front Range, Colorado, four climax regions, 1953-1958. University of Colorado Studies, Series in Biology 28, 169 pp. Marr, J.W., J.M. Clark, W.S. Osburn, and M.W. Paddock. 1968. Data on mountain environments. III. Front Range, Colorado, four climax regions, 1959-1964. University of Colorado Studies, Series in Biology 29, 181 pp. Precipitation data were collected from a ridgetop climate station east of Niwot Ridge (B-1 @ 2591 m) throughout the year using a chart recorder. Initially, instrumentation consisted of an 8-inch metal rain gauge with the receiving rim about 3 feet above the ground and measurements were made on an approximately weekly basis. More recently, instrumentation consisted of a Fergusson-type weighing rain gauge. Precipitation was caught in a bucket containing ethylene glycol (to melt snow) and light oil (to prevent evaporation). As the weight of the bucket increased, the pen moved up via a spring mechanism and recorded on a rotating chart. Precipitation was recorded on a continuous basis. NOTE: The LTER data portal display does not display important maintenance/log information or other EML metadata features. Please be sure to view the EML file (a text file that contains XML tags) which is included in the zip archive (click on "Download zip archive") pertaining to each dataset. The EML file name will have the following format: knb-lter-nwt.[3 digit dataset number].[version number].xml. Most web browsers can parse the EML so it's easier to read.