The data are here.
The dataset includes the following variables:
Max, min, mean temperature (Celsius)
Relative Humidity (%)
Pan evaporation (mm/day)
Hours of Sun (hrs/day)
Potential Evapotranspiration (mm/day)
NOTE: There appears to be erroneous data for Las Brujas. The pan evaporation and potential evapotranspiration data are identical for the time period Jul 1974 - Jun 1987.
More information about the Instituto Nacional de Investigación Agropecuaria (INIA) and the Grupo de Agroclima y Sistemas de Información (GRAS) can be found here.