How to filter a dataframe of dates by a particular month/day?

Using pd.to_datetime & dt accessor

The accepted answer is not the “pandas” way to approach this problem.
To select only rows with month 11, use the dt accessor:

# df['Date'] = pd.to_datetime(df['Date']) -- if column is not datetime yet
df = df[df['Date'].dt.month == 11]

Same works for days or years, where you can substitute dt.month with dt.day or dt.year

Besides that, there are many more, here are a few:

• dt.quarter
• dt.week
• dt.weekday
• dt.day_name
• dt.is_month_end
• dt.is_month_start
• dt.is_year_end
• dt.is_year_start

For a complete list see the documentation