Soil moisture, temperature and relative humidity for subalpine forest permanent plots, 2017 - 2021.

We collected microclimate data for 12 permanent forest plots in subalpine forests and at alpine treeline at Niwot Ridge, Colorado, USA. We collected soil temperature (2015-2020), air temperature (2015-2020), air relative humidity (2015-2020), and soil moisture data (2015-2019). Soil temperature, air temperature, and air relative humidity data were collected year-round, but they are not necessarily continuous during the sample period due to instrument failure. The goal of winter soil temperature data collection was to estimate snow duration. Soil moisture was collected every two weeks from 2015-2019 and continuously from June to October in three sites in 2018 and 2019. See data for periods of sampling and methods for details on sampling interval and instrumentation.