Home Assistant Average Indoor Temperature Sensor

average_indoor_temperature.yaml

- sensor:
  - unique_id: sensor.indoor_temperature_average
    name: "Average Indoor Temperature"
    unit_of_measurement: "°C"
    device_class: temperature
    state_class: measurement
    state: >
      {%- set input_group = expand('group.sensors_temperature_indoor') -%}
      {%- set temperatures = input_group|map(attribute='state')|map('float',undefined)|select('defined')|list -%}
      {%- if temperatures|length() <= 0 -%}
        unavailable
      {%- else -%}
        {{ (temperatures|sum() / temperatures|length())|round(2) }}
      {%- endif -%}
  trigger:
    - platform: state
      entity_id: group.sensors_temperature_indoor
    - platform: event
      event_type: event_template_reloaded
    - platform: homeassistant
      event: start