A series of full-scale measurements in the real environment were made to assess the magnitude and variability of wind-induced convective heal transfer from a raised heated surface mounted directly on to the pitched roof of a domestic size building. The heated plate had dimensions similar ro those of a typical flat-plate solar collector (1.81 x 0.89 m(2)), giving a Reynolds number range of approximately 1 x 10(5) to 5 x 10(5). The measured forced convective heat transfer coefficient h(w) was correlated against the wind speed V and the wind direction prevailing at the site of the building during the periods of measurement. For a range of wind directions it was found that both power and linear relationships between h, and V adequately represented the experimental results. Some sheltering effects were observed when the heated plate was leeward to the prevailing wind direction. Values of h(w) measured in this study were in good agreement with data derived from previous wind tunnel and field work.