Calculate average of three max values of hourly power sensor

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I have a sensor which stores power (kWh) used per hour.

sensor
sensor680×696 30.9 KB

I would like to get the max value per date in current month, then calculate the average of the three max values (unique dates) per month.
Here is a python script showing what I’d like to accomplish:

max_value_per_date = []
for date in january:
	date_values = []
	for hour in date:
		date_values.append(sensor.strombruk_time[hour])

	max_value_per_date.append(max(date_values))

three_max_values_in_month_dates = max_value_per_date.sort()[-3:]
average = three_max_values_in_month_dates  / 3
return average

Anyone know if this is possible and how I calculate this in home assistant?