A fast and simple method for estimating the rotational temperature from the partially resolved (3, 0) hand of the first positive system of N-2 (B-3 Pi(g)-A(3) Sigma(u)(+)) has been developed by numerical simulation of the (3, 0) band profile, polynomial linear least-square fitting, and polynomial interpolation. The sensitivity of the proposed method is based on the temperature dependence of the relative population of the 3 Pi(Omega)] substates. Simple polynomial formulas allow calculation of the rotational temperature in the rang of 200-1500 K from the (3, 0) band profile after reading the subband head peak values. This method has been tested on the experimental (3, 0) band emission recorded in N-2 pulsed rf discharges.