Time-series boxplot in pandas

Question

How can I create a boxplot for a pandas time-series where I have a box for each day?

Sample dataset of hourly data where one box should consist of 24 values:

Answer 1

(Not enough rep to comment on accepted solution, so adding an answer instead.)

The accepted code has two small errors: (1) need to add numpy import and (2) nned to swap the x and y parameters in the boxplot statement. The following produces the plot shown.

import numpy as np
import pandas as pd
import seaborn
import matplotlib.pyplot as plt

n = 480
ts = pd.Series(np.random.randn(n), index=pd.date_range(start="2014-02-01", periods=n, freq="H"))

fig, ax = plt.subplots(figsize=(12,5))
seaborn.boxplot(ts.index.dayofyear, ts, ax=ax)