Convective heat-transfer measurements were taken on a NACA 0012 airfoil with leading-edge distributed roughness simulating ice-accretion roughness. Roughness heights of 0.35 and 0.75 mm were used and tests were conducted at three tunnel turbulence levels and three Reynolds numbers. Convective heat-transfer coefficients approached three times the clean airfoil values over the roughness at a Reynolds number of 2.25x10⁶. Results with tunnel turbulence values as high as 0.95% had little effect on the convective heat transfer prior to boundary-layer transition. Downstream of the roughness the heat transfer was in general less than the predicted turbulent value. A method for measuring the turbulence level in an icing tunnel spray cloud with a conventional hot wire is presented. Preliminary results from the NASA Icing Research Tunnel showed that the elevated turbulence levels with the spray cloud on are due to the nozzle air pressure and the presence of the water has only a small effect.