Count history_stats starts at 1, not 0

Configuration
2

I assume you are adding up the on and off state flips to get a total and then multiplying that by the tip volume to get the amount of rain?

If so here’s an alternative to using history stats:

(configuration.yaml)

template:
  - trigger:
      - id: count
        platform: state
        entity_id: binary_sensor.aqara_dw_2_open_closed
        to:
          - 'on'
          - 'off'
        from:
          - 'on'
          - 'off'
      - id: reset
        platform: time
        at: '0:00'
    sensor:
      - name: 'Rain per day'
        unit_of_meaurement: 'mm' # or cm
        state_class: measurement # only include this if you want long term statistics 
        device_class: precipitation
        state: >
          {% set mm_per_flip = 0.2 %}
          {% if trigger.id == 'reset' %}
            0
          {% else %}
            {{ this.state | float(0) + mm_per_flip }}
          {% endif %}

Change the mm / flip value to your bucket tip volume.

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