Climate data for A1 chart recorder, 1952 - 1970.

Climatological data were collected from a ridgetop climate station east of Niwot Ridge (A1 at 2195 m) throughout the year. Parameters measured were temperature, relative humidity, solar radiation, and precipitation. The station was initially instrumented with a thermohygrograph (regularly calibrated and checked with maximum and minimum thermometers and psychrometers), standard 8-inch precipitation gauge installed with the rim 1 m above ground, totalizing anemometer (approximately 0.7 m above the general level of tree crowns), and maximum and minimum soil thermometers at approximately 15 and 30 cm depth. A recording precipitation gauge was installed in 1965. The installation in the clearing was positioned so that the gauge rim subtended an angle of 45 degrees to the tree crowns although the most effective angle is 30 degrees according to Leaf (1962).