Correlations available in the literature to predict hourly ambient temperature are climate specific. Based on extensive meteorological database, correlations to predict hourly ambient temperature in terms of maximum and minimum temperatures of the day have been developed. The applicability of the present correlation has been examined for a wide range of locations, along with its comparison with other correlations developed earlier for a specific set of locations. The performance of the present correlation has been found to be superior to the performance of the existing correlations. Monthly average hourly ambient temperature values predicted with the present correlation agree with the data values within r.m.s differences of 0.26% when the ambient temperature is in K and the absolute error has been found to be 0.75.