Beginning in 1996, four newly constructed flexible pavements in Tennessee were instrumented with automated weather stations and various in situ devices to measure temperature and moisture conditions throughout the pavement system. Since their completion, falling weight deflectometer (FWD) tests have been performed periodically to assess the seasonal changes in pavement response. The collected data were analyzed to establish correlations between the pavement layer moduli (backcalculated from the FWD results by using MODULUS, Version 5.0) and the asphalt layer temperature. The use of the BELLS3 model to relate asphalt temperature to air and surface temperatures is also explored.