Climatic surfaces were generated using the software Anusplin v.4.36 (Hutchinson, 2006), which implements the methods described in Hutchinson (1995). 
We modelled monthly data for a time period of 50 years (1950-2000) of precipitation (P), mean temperature (T), mean maximum temperature (M) and mean minimum temperature (m) 
obtained from a total of 930 weather stations in Chile, Bolivia, Peru and Argentina. We used the stations reported by Hajek & di Castri (1975), Amigo & Ramírez (1998), 
Faoclim dataset (FAO 2001), Rivas-Martínez et al. (2003) and Luebert & Pliscoff (2006). Interpolations were fitted with the second-order spline method 
using elevation as an independent variable (Hutchinson 2006) at 1 km spatial resolution.

References

Amigo, J. & Ramírez, C. (1998) A bioclimatic classification of Chile: woodland communities in the temperate zone. Plant Ecology 136: 9–26.

FAO (2001) FAOCLIM 2.0 A world-wide agroclimatic database, Food and Agriculture Organization of the United Nations, Rome.

Hajek, E.R. & di Castri, F. (1975) Bioclimatografía de Chile, Dirección de Investigación, Vice-Rectoría Académica, Universidad Católica de Chile, Santiago.

Hutchinson, M.F. (2006) Anusplin vesion 4.36 user guide, Australian National University, Centre for Resource and Environmental Studies, Canberra.

Hutchinson, M. F. (1995) Interpolating mean rainfall using thin plate smoothing splines. International journal of geographical information systems 9: 385-403

Luebert, F. & Pliscoff, P. (2006) Sinopsis bioclimática y vegetacional de Chile, Editorial Universitaria, Santiago.

Rivas-Martínez, S., Penas, A., Luengo, M.A. & Rivas-Sáenz, S. (2003) Worldwide bioclimatic classification system, Backhuys Publishers, Leiden.