Frost warning via weather forecast

[123 (Taras)]

Should you be interested in a way to get tomorrow’s forecasted maximum or minimum temperatures from OpenWeatherMap, Petro posted a three-line template here:

Beginner's templating question

you can do this with generators and without the namespace btw {% set start = (now().replace(hour=0,minute=0,second=0).timestamp() * 1000) | int %} {% set end = start + 86400000 %} {{ state_attr('weather.openweathermap', 'forecast') | selectattr('datetime', '>', start) | selectattr('datetime','<=', end) | map(attribute='temperature') | list | max }} not as easy to read but for learning purposes. Personally, I find generators easy to work with once you get the hang of them.

It would be trivial to make it into a frost warning sensor.

NOTE
Any solutions based on the DarkSky API are now subject to the following limitations:

• If you already have a DarkSky API key, the API service will terminate at the end of 2021.
• If you do not currently have a DarkSky API key, you are no longer able to get one.