template.yaml

# Choose which sensor type(s) - this first one is simple and relies only on simple sensors or derivative sensors

- sensor:
    - name: LED Clock Data
      unique_id: led_clock_data
      state: "OK"
      attributes:
        # The numbered attributes (0 to 9) are info screens
        1:>
          {%- if states('sensor.inside_temperature') not in ['unavailable', 'unknown'] -%}
            {{ states('sensor.inside_temperature') | float | round(0) }}~C
          {%- endif %}

# This style is for a sensor that relies on at least one service call (ie. for weather) - you can still use simple/derivative sensors

- trigger:
    - platform: time_pattern
      minutes: /5
  action:
    - service: weather.get_forecasts
      data:
        type: hourly
      target:
        entity_id: weather.openweathermap_hourly
      response_variable: hourly
  sensor:
    - name: LED Clock Data
      unique_id: led_clock_data
      state: "OK"
      attributes:
        # The numbered attributes (0 to 9) are info screens
        0: >
          to{{ hourly["weather.openweathermap_hourly"].forecast[0].temperature | round(0) | default('NA') }}
        1:>
          {%- if states('sensor.inside_temperature') not in ['unavailable', 'unknown'] -%}
            ti{{ states('sensor.inside_temperature') | float | round(0) }}
          {%- endif %}

# Note that for 1: Inside temperature, it checks to see if it is available, otherwise it is blank - and the clock will skip over blanks!