How to mark a measurement as a temperature?

Configuration
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I have a DHT-22 temperature sensor that reports it’s values via a MQTT queue, but when the value is displayed in HA it looks like this rather than the graph of temperatures I was expecting:

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How do I mark it as a value to be graphed?

2

unit_of_measurement: "C"

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unit_of_measurement: '°C'

to be precise (mind the °) …

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4

I’ve tried both the suggestions here & it still just shows as it does in the original post.

Here’s the config:

- platform: mqtt
  state_topic: bruh/sensornode1
  name: "Office Temperature"
  unit_of_measurment: °C
  value_template: '{{ value_json.temperature | round(1) }}'

Currently no quotes round the unit of measurement, but I’ve tried it with & without, double & single quotes …