How to get "Starter" that uses high external temp as trigger?

[GP99]

I am trying to "start" an automation based on high (or low) external temperatures.  I am using Google Home to manage the Nest thermostats in my house.   I know that bouncing around with a house temp is frowned on.  Even so, I have been running a manual "automation" where I start heating 1 hour before the daily high external temp at my zip code and run until the inside thermostat hits a predetermined set point.  How do I get a "start" for automation based on varying daily high temperature for the zip code entered in my Google Home profile?

[moralesvicente]

Hello GP99, 

Thanks for reaching out to the Google Community Forum. I understand you want to start automation based on high or low external temperatures with your Nest Thermostat. It’s a pleasure to share more information. 

Routines let you automate tasks for your smart home devices, making daily life easier for everyone in your household. To learn more about how automation works, I suggest checking out this article: Create and manage Routines, and set the preferences that you want to use.

Please let me know if this suggestion is helpful. 

Best regards, 

Daniel