Fine Spatio-temporal Resolution Temperature and Humidity iButton Data at the Colorado State University Mountain Campus, August 25 to September 28, 2018

Seventeen iButton sensors were installed along an elevational transect from the top of a lateral moraine (2804 m.a.s.l.) on the west side of the Colorado State University Mountain Campus (CSU-MC) across the South Fork of the Cache la Poudre River (2745 ma.s.l.) to the base of the lateral moraine on the west side of the CSU-MC. This transect was approximately on the north side of the trail from the Homestead Bridge toward Sky Ranch. Twelve (T01 to T12) were thermochron iButton sensors that measured temperature only, with a 0.5°C temperature and 10-minute temporal resolution. Five (T21 to T25/ RH21 to RH25) were hygrochron iButton sensors that measured temperature at 0.0625°C and 20-minute resolution, and relative humidity at 0.04%RH and 20-minute resolution. All sensors were suspended by a fob in a double-set of ordinary white kitchen funnels employed as radiation shields. A medium (12.7 cm tall and 12 cm in diameter) funnel was placed inside a large (15.2 cm tall and 14 cm diameter) outside funnel. The inside funnel had about twelve 0.64 cm diameter holes drilled into it. Each shielded sensor was placed approximately 2-m above the ground on the north side of an evergreen trees. Data were downloaded every two weeks by removing the sensor from the fab and inserting into a USB dongle. Data measured during downloading were removed as temperatures warmed during handling (0.1% of the data). All missing and removed data were assigned values of -9999. One hygrochron was in an area that receives fog/excessive dew, and recorded relative humidity greater than 100% for 26 of the 1446 20-minute measurements. Locations are UTM coordinates in UTM 13N WGS84 datum obtained using a Garmin eTrex 10 Global Positioning System. The sensor elevation was extracted from National Elevation Dataset 10-m digital elevation model.