import matplotlib.pyplot as plt
#---Some code to read in the data
# ...

#-----Get a A4 sized landscape figure
fig=plt.figure(figsize=(11.69,8.27), dpi=100)

#----2*3 Subplots-------------
for ii in range(6):
    ax=fig.add_subplot(2,3,ii+1)

    #---Basemap contourf of data
    baseIsofill(var[ii],ax,'local')
    ax.set_title('(a)',loc='left')


#plt.tight_layout()
plt.tight_layout(pad=2.0,h_pad=6.5,w_pad=4.5)
plt.show()