Alerts via ntfy.sh with a "pipe freeze alert" when the temperature in the next 3 days falls below a threshold

weather_alert.py

#!/usr/bin/env python3

import json
from datetime import datetime
import requests

latitude = 25.2510383
longitude = 55.2936404
threshold = -4
ntfy_url = "https://ntfy.sh/mytopic"

def main():
    api_url = f"https://api.open-meteo.com/v1/forecast?latitude={latitude}&longitude={longitude}&hourly=temperature_2m&timezone=America%2FNew_York&forecast_days=3"

    response = requests.get(api_url)
    data = response.json()

    timestamps = data["hourly"]["time"]
    temperatures = data["hourly"]["temperature_2m"]

    alert_timestamp = False
    alert_temperature = 100    
    current_time = datetime.utcnow()
    
    for timestamp, temperature in zip(timestamps, temperatures):
        timestamp_datetime = datetime.fromisoformat(timestamp)

        if timestamp_datetime > current_time and temperature < alert_temperature:
            alert_timestamp = timestamp_datetime
            alert_temperature = temperature

    if alert_temperature <= threshold:            
        data = f"Lowest temperature is {alert_temperature}°C at {alert_timestamp}. Be sure to let the water drip from the faucet to prevent pipes from freezing.".encode(encoding='utf-8')
        headers = { 
           "Title": f"Pipe freeze alert, {alert_temperature}°C!".encode(encoding='utf-8'),
           "Tags": "cloud_with_snow,cold_face",
           "Priority": "high"
        }
        requests.post(ntfy_url, data=data, headers=headers)
        print(data)
        print(f"Sent high priority alert to {ntfy_url}")
    else:
        data = f"Lowest temperature is {alert_temperature}°C at {alert_timestamp}. That's fine, no need to worry about the pipes.".encode(encoding='utf-8')
        headers = { 
           "Title": f"Lowest temperature is {alert_temperature}°C, all good".encode(encoding='utf-8'),        
           "Tags": "+1",
           "Priority": "low"
        }
        requests.post(ntfy_url, data=data, headers=headers)
        print(data)
        print(f"Sent low priority message to {ntfy_url}")

if __name__ == "__main__":
    main()