Mean temperature (°C * 10), coldest quarter, 1960-1990, smoothed using a focal mean function with a circular,10km^2 moving window.Source: Hijmans, R.J., S.E. Cameron, J.L. Parra, P.G. Jones, and A. Jarvis. 2005. Very high resolution interpolated climate surfaces for global land areas. International Journal of Climatology 25: 1965-1978.