import iris

temp = iris.load_cube(iris.sample_data_path('air_temp.pp'))
print temp.summary(shorten=True)

import iris.quickplot as qplt
import matplotlib.pyplot as plt

plt.figure(figsize=(10, 10))
qplt.contourf(temp)
plt.gca().coastlines()
plt.show()

import iris.quickplot as qplt
import matplotlib.pyplot as plt

plt.figure(figsize=(11, 11))

cs = qplt.contourf(temp)
cbar = cs.colorbar

cbar.set_ticks([250, 270, 290])

plt.gca().coastlines()

plt.show()