Statistic sensor reset/clear at midnight for daily min & max temperature

Configuration
8

The following Trigger-based Template Sensor reports the highest daily temperature (based on whatever temperature sensor you specify).

- trigger:
    - platform: time
      at: '00:00:00'
    - platform: state
      entity_id: sensor.outdoor_temperature
  sensor:
    - name: 'Today Max Temp'
      unit_of_measurement: '°C'
      device_class: temperature
      state: >
        {% set t_new = states('sensor.outdoor_temperature') | float(-99) %}
        {{ [t_new, this.state | float(-99)] | max if trigger.platform != 'time' else t_new }}
      attributes:
        temperature_updated: "{{ now() | as_local }}"

It’s initial value will be unknown. It will begin reporting a value when the temperature sensor’s value changes. At midnight (start of a new day) it sets its value to whatever is the temperature sensor’s current value.

A similar Trigger-based Template Sensor can be created for reporting the daily minimum temperature (replace the template’s max filter with min).

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