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Climate data for D1 chart recorder from 1952-10-1 to 1982-12-31, daily

Data set creator(s): Mark Losleben

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INSTAAR, University of Colorado
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(720) 369-3550

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Data Usage Summary
  • Data Use Policy

    1. Use our data freely. All Niwot LTER data products (except some recent data sets for which metadata but not data are available) are released to the public and may be freely copied, distributed, edited, remixed, and built upon under the condition that you provide acknowledgement as described below.

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Climatological data were collected from a Niwot Ridge climate station (D1 at 3743 m) throughout the year. Parameters measured were temperature, relative humidity, solar radiation, precipitation, and wind speed. The station was initially instrumented with a thermohygrograph (regularly calibrated and checked with maximum and minimum thermometers and psychrometers), which was equipped with a Bourdon tube (to measure temperature) and a banjo-spread hair element (to measure relative humidity). The thermohygrograph was situated in a white, all wood, louvered Stevenson screen which is oriented with the door facing north. The station was initially instrumented with a standard 8-inch precipitation gauge installed with the rim 1 m above ground. This gauge was not shielded prior to October 1964. A recording precipitation gauge was installed in 1965. An Alter shield and snow fence were placed around the gauge to give more accurate precipitation measurements during windy conditions. 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, a pen moved up via a spring mechanism and recorded on a rotating chart. Solar radiation was recorded on a bimetalic strip mechanical actinometer. Ninety percent of solar radiation from 360 to 2000 nm was transmitted through the instrument's glass dome. The station was initially instrumented with a totalizing anemometer (2 m height). Wind speed (peak gust) was subsequently measured with a 3-cup, AC-generating anemometer that continuously recorded onto an Esterline Angus strip chart recorder. Wind direction was recorded as a pen position on a continuously recording strip chart. The thermohygrograph, rain gauge, and actinometer all used wind-up or battery-driven clock drives that rotated the recording chart on a right cylindrical drum with a fixed period between 24 h and 861 h depending on the gears used. These clock mechanisms were virtually identical and therefore completely interchangeable among the instruments.


Study site was D1 (located on the crest of the ridge approximately 2 km east of the Continental Divide). Original data are stored with the NWT LTER data manager and at the Mountain Research Station.

Date Range:

1952-10-1 to 1982-12-31




air temperature, relative humidity, wind speed, wind direction, solar radiation, precipitation

Location: D1 chart recorder

At a glance:

D1 site
Elevation: 3750 m


Location Group: D1

Found within: Niwot Ridge (USFS - UNESCO Biosphere Reserve)
Located in: USFS - UNESCO Biosphere Reserve
(Click to learn more about these locations)

More data from: D1

Core Data Set: No
Discipline: Climatology/meteorology

Data Citation

Losleben, Mark. 2018. Climate data for D1 chart recorder from 1952-10-1 to 1982-12-31, daily.

CU Boulder

This material is based upon work supported by the National Science Foundation under Cooperative Agreement #DEB-1637686. Any opinions, findings, conclusions, or recommendations expressed in the material are those of the author(s) and do not necesarily reflect the views of the National Science Foundation.

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