seaborn x label date format align day of week abbreviation

Question

How can I align the day of week abbreviations to be on the same level? Currently, it is alternating.

import pandas as pd
import seaborn as sns; sns.set()

df = pd.DataFrame({'dt':['2020-01-01', '2020-01-02', '2020-01-03', '2020-01-04'], 'foo':[10, 15, 8, 13]})
df['dt'] = pd.to_datetime(df['dt'])
display(df)

ax = sns.lineplot(x='dt', y='foo', data=df)

import matplotlib.dates as mdates
date_form = DateFormatter("%a %d-%m")
ax.xaxis.set_major_formatter(date_form)
ax.xaxis.set_major_locator(mdates.DayLocator(interval=1))
plt.xticks(rotation=90, horizontalalignment='center', fontsize=28)
''

Answer 1

The simplest way to align the start of the tick labels would be to rotate the other way around:

plt.xticks(rotation=-90, ha='center', fontsize=28)

Alternatively, the tick labels can be vertically aligned to the bottom, but then they need to be shifted down. The exact distance depends on font, fontsize and text length:

plt.xticks(rotation=90, ha='center', va='bottom', fontsize=28)
plt.tick_params(axis='x', which='major', pad=150)

Still another option is to choose a monospace font. Note that with a usual font, a 'W' takes up much more space than an 'i'. If such a monospace font is desired, "courier new" is one of best-looking options.

plt.xticks(rotation=90, horizontalalignment='center', fontsize=28, family=['courier new', 'monospace'])