How to add data from multiple files to a single plot figure?

Thank you in advance for your help! (Code Below) (Link to 1st piece of data) (Link to data I want to add)

I am trying to import data from a second CSV (above) and add a second line to this plot based on that CSVs data. What is the best approach to doing this? (Images below)

The squiggly lines on the plot represent the range of data.

import pandas as pd
import numpy as np
import matplotlib.pyplot as plt
import warnings
warnings.filterwarnings('ignore')

raw_data = pd.read_csv('all-deep-soil-temperatures.csv', index_col=1, parse_dates=True)
df_all_stations = raw_data.copy()

selected_soil_station = 'Minot'
df_selected_station = df_all_stations[df_all_stations['Station'] == selected_soil_station]
df_selected_station.fillna(method = 'ffill', inplace=True);
df_selected_station_D=df_selected_station.resample(rule='D').mean()
df_selected_station_D['Day'] = df_selected_station_D.index.dayofyear
mean=df_selected_station_D.groupby(by='Day').mean()
mean['Day']=mean.index

maxx=df_selected_station_D.groupby(by='Day').max()
minn=df_selected_station_D.groupby(by='Day').min()
mean['maxx20']=maxx['20 cm']
mean['minn20']=minn['20 cm']

plt.style.use('ggplot')
bx = mean.plot(x='Day', y='20 cm',color='black')
plt.fill_between(mean['Day'],mean['minn20'],mean['maxx20'],color='blue',alpha = 0.2);
bx.set_xlabel("Day of the year")
bx.set_ylabel("Temperature in Celsius")
bx.set_title("Soil Temp, Air Temp, and Snow Depth for " + str(selected_soil_station))

What I have:

enter image description here

What I want to have:

enter image description here



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