At sea level the value of g is minimum at :

g value is minimum at the equator and keep on increasing as we move towards the equator.

${\mathrm{g}}^{\text{'}}=\mathrm{g}\left(1-\frac{{\mathrm{\omega }}^2{\mathrm{Rcos}}^2\mathrm{\lambda }}{\mathrm{g}}\right) \mathrm{where} \mathrm{\lambda } \mathrm{is} \mathrm{the} \mathrm{lattitude} \mathrm{angle}.$