2018-02-09 · Area of study. The study was done in Ol-joro-Orok sub-county, in central Kenya. The area lies between 0° 09’ S and 36° 24′ E covering an area of about 359 km 2 and about 2359 m above sea level. The average minimum and maximum temperature for the last 24 years ranges 5–8 °C and 20–23 °C, respectively, while annual rainfall over the same period averages