Soil temperature is measured in 0.00, 0.25, 0.50, 0.75, 1.00, 1.25, 1.50, 1.75, 2.00, and 2.50 meters below the surface in a grassland, just east of the runway. The site is called 'Grassland'. Temperature is recorded every hour. Measurements were initiated in september 2012. Blank cells are missing data. Temperature is measured with Geo-Precision thermistor strings.