1 ticks
ax[row, col].set_yticks([20,30,40,50]) labels = ax[row, col].set_yticklabels(["20$^o$ N","30$^o$ N","40$^o$ N", "50$^o$ N"]) ax[0,2].set_xticks(ax[0,2].get_xticks()[1:-1], ['{0}°'.format(str(int(lon))) for lon in ax[0,2].get_xticks()[1:-1]])