Source of External temperature

I have searched but cannot find the answer. I have had a mionitor installed for about three months but I don’t know where it obtains the external temperature from. The reading has become intermittent recently.
Is there an external sensor is the data from weather data on the web?
The system was put in by my HP installer.

Are you viewing your local portal (IP address or emonhp.local) or EmonCMS.org / Heatpumpmonitor.org?

If you are viewing locally then the installer may have configured a local or web source for temperature (would need to check).

If you are viewing the online portal then this is configured on the back end using met office data sources based on your postcode as far as I am aware.

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