Test Reference Year-type (TRY) weather data
It is usually accepted to use climatic data from other places, if these are not farer than 50 km and within 100 m of elevation.
More information on selecting weather data appropriate for energy simulation is described in this paper Drury B. Crawley. 1998. "Which Weather Data Should You Use for Energy Simulations of Commercial Buildings?" in ASHRAE Transactions, pp. 498-515, Vol. 104, Pt. 2. Atlanta: ASHRAE.