A decade ago when we began to evaluate different regions for walnut production, we commissioned a study of the local weather conditions in Santa Rosa County and the area surrounding Las Catitas. Included in the study are the Evapotranspiration reference values for the area. We invite you to read the complete study, but the highlights are as follows:
Annual rainfall averages 6.8 inches (173 mm).
Supplemental irrigation is required for cultivation.
The area averages 1350 chill hours and 800 Richardson Cold Units per year.
Relative humidity ranges from 35-65%.