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Infilled climate data for C1, Saddle, D1 from 1990-1-1 to 2013-12-31, hourly

Data set creator(s): Keith Jennings; Timothy Kittel; Noah Molotch

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For methodology questions, contact Hope Humphries
INSTAAR, University of Colorado
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Boulder, CO 80309-0450
(303) 492-2594

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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.

    2. Give proper acknowledgement. Publications, models and data products that make use of these data sets must include proper acknowledgement, including citing data sets in a similar way to citing a journal article. See The following acknowledgment should accompany any publication or citation of these data: Logistical support and/or data were provided by the NSF supported Niwot Ridge Long-Term Ecological Research project and the University of Colorado Mountain Research Station

    3. Let us know how you will use the data. The data set creators and Niwot LTER would appreciate hearing of any plans to use the data set. Consider consultation or collaboration with data set creators.

    4. Although efforts have been made to ensure that these data are of the highest quality, the possibility of errors exists. Plase notify the data manager of any errors at


This serially complete dataset includes hourly, quality-controlled, infilled meteorological data for three sites at the Niwot Ridge LTER: C1, Saddle, and D1, representing subalpine, alpine, and high-alpine environments, respectively. Raw observations of air temperature, relative humidity, wind speed, and incoming shortwave radiation were subjected to a rigorous hierarchical quality control and infilling protocol to make a robust, continuous dataset. Incoming longwave radiation was estimated using air temperature, relative humidity, and incoming shortwave radiation. Precipitation data were accessed from the Niwot Ridge LTER quality controlled datasets and Kittel et al. (2015). Precipitation values from C1 and Saddle were then corrected for gage undercatch (C1) and overcatch (Saddle) based on observations of snow accumulation at the Niwot SNOTEL station and snow pits located near the met stations (D1 precipitation data were not corrected as there were no available observation of snow accumulation). Daily precipitation values were temporally disaggregated to the hourly time step of the dataset.
This dataset was originally created to force a physics-base snow model and is suitable for use in other research models that require hourly forcing data. Please contact the dataset's creators or the LTER data manager if you have any questions regarding the data or its applicability/suitability to your project.
Disclaimer: These data come as-is with no warranty. The user must decide whether or not to use different variables and time periods within the dataset and whether further processing is warranted. In general, the data quality is higher and there are fewer infilled values from 2000 to 2013. The higher number of infilled entries before 2000 may preclude the 1990–1999 period from being used in a given analysis. This is particularly true for relative humidity and incoming solar radiation. The Niwot Ridge LTER is not responsible for the methodological choices made by those using the data.
For cross-validation statistics on the infilling procedure and further information on the protocol, please see Jennings et al. (2017) in The Cryosphere: Observations and simulations of the seasonal evolution of snowpack cold content and its relation to snowmelt and the snowpack energy budget. (DOI for paper will be added when available)


C1: latitude 40.036336, longitude -105.543542, elevation 3022 m
Saddle: latitude 40.05421, longitude -105.589042, elevation 3528 m
D1: latitude 40.059798, longitude -105.616393, elevation 3739 m

Date Range:

1990-1-1 to 2013-12-31




air temperature, relative humidity, wind speed, incoming shortwave radiation, incoming longwave radiation, precipitation

Location: C1 • Saddle • D1

At a glance:

C1 site
Elevation: 3048 m

Saddle site
Elevation: 3500 m

D1 site
Elevation: 3750 m


Location Group: C1, Saddle, 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: C1, Saddle, D1

Core Data Set: No
Discipline: Climatology/meteorology, Hydrology, Atmospheric science
Award Or Grant: DEB1027341, DEB1637686

Data Citation

Jennings, Keith. Kittel, Timothy. Molotch, Noah. 2017. Infilled climate data for C1 Saddle D1 from 1990-1-1 to 2013-12-31, hourly.

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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