How do I concatenate json zip files in Python? - json

Question

I have a file with, containing 61 zipfiles which each contain 17280 zip files.
The file exists of sensordata for the months April and May and the 61 zipfiles exist of the sensordata per day for these months. The 17280 zip files contain the data for these days per 5 seconds.
I wrote a code to open the data per day in Jupyter Notebook, but I want to open them per month. Here is my code for opening the data per day:
path = 'test_tudelft'
data = pd.DataFrame() # verzameling van alle data
for zip_filename in os.listdir(path): # loop over de zipbestanden
with zipfile.ZipFile(os.path.join(path, zip_filename)) as zf: # open een zipbestand
for file in zf.filelist: # loop over de ingepakte bestanden
# data = pd.concat((data, pd.read_json(zf.open(file), lines=True))) # lees de nieuwe data en voeg samen
data_new = pd.read_json(zf.read(file).decode('utf8')[2:-1], orient='index').T
data = pd.concat((data, data_new)) # lees de nieuwe data en voeg samen
data = data.reset_index(drop=True) # unieke index per bestand
This code works to make plots of the data per day, but I would like to plot the data per month. How can I change my code to open the zipfiles in the zipfiles?