Over centuries, ground water has been an important source of water. So, awareness about its temporal

and spatial variability, in different zones, is necessary, and Geostatistics is a vital technique for this

purpose. In this study, 76 wells (water year of 1382-1383) and 71 wells related to Gonabad plains were

prepared and their descriptive statistic, trend and semivariogram were separately evaluated for each

season. Then, prediction maps were organized. Temporal variability of water table for each season and its

spatial variability for different places were calculated. South-north trend and southeast-northwest

anisotropy were observed for all seasons. Every season except winter had exponential model with major

and minor range of 20 and 15 km, respectively. Winter in different years had spherical model with major

(23 to 28 Km) and minor (15 km) range too. The highest uncertainty belonged to some places that have

the greatest distance from each other.