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.