Rotate minor and major label in matplotlib

figure = plt.figure()
axes = figure.add_subplot (1, 1, 1)

axes.plot(m_time, m_temp, linestyle='-', color='orange', label = 'max : '+str(max(m_temp))+'\n'+'min  : '+str(min(m_temp)), linewidth=2)
y_step = matplotlib.ticker.MultipleLocator(base=0.5)
axes.yaxis.set_major_locator(y_step)
plt.xticks(rotation=90)

f_hour_min = mpl.dates.DateFormatter('%H:%M')
f_day = mpl.dates.DateFormatter('%a %d. %b %Y')

#format grid
axes.xaxis.grid(True, which='major', linestyle='solid')
axes.xaxis.grid(True, which='minor')
axes.yaxis.grid(True, which='major')
axes.axis([min(m_time), max(m_time), min(m_temp)-0.5, max(m_temp)+0.5])

#format major labels out
axes.xaxis.set_major_formatter(f_day)
day_tick = mpl.dates.DayLocator()
axes.xaxis.set_major_locator(day_tick)
major_labels = [tick.label1 for tick in axes.xaxis.get_major_ticks()]
for label in major_labels:
    label.set_rotation(90)
    label.set_ha('center')
    label.set_va('bottom')
    label.set_bbox(dict(facecolor='white', edgecolor='black', boxstyle='round,pad=0.5'))
axes.xaxis.set_tick_params(which='major', pad=-10)

#format minor labels out
axes.xaxis.set_minor_formatter(f_hour_min)
min_tick = mpl.dates.MinuteLocator(interval=30)
axes.xaxis.set_minor_locator(min_tick)
minor_labels = [tick.label1 for tick in axes.xaxis.get_minor_ticks()]
for label in minor_labels:
    label.set_rotation(50)
    label.set_ha('right')