high_low.py

import json

with open('history_data.json') as json_file:
    data = json.load(json_file)
    day_min_max = []
    min = 0
    max = 0
    day = 0
    leap_counter = 0
    for idx, hour in enumerate(data):
        if idx % 24 == 0:
            if idx != 0:
                day_min_max.append({'date': day, 'high_temp': max, 'low_temp': min})
                day += 1
                if leap_counter % 4 == 0:
                    if day == 366:
                        leap_counter += 1
                    day = day % 366
                else:
                    if day == 365:
                        leap_counter += 1
                    day = day % 365
            min = hour["main"]["temp_min"]
            max = hour["main"]["temp_max"]
        if hour["main"]["temp_min"] < min:
            min = hour["main"]["temp_min"]
        if hour["main"]["temp_max"] > max:
            max = hour["main"]["temp_max"]
    with open('historical_day_data.json', 'w+') as outfile:
        json.dump(day_min_max, outfile)