Mean isothermality ((Mean diurnal range / temperature annual range) * 100); °C * 10, 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. http://www.worldclim.org/current