Freezing weather notification

[sveggeth]

I'm trying to make a notification occur at 7am if the temperature dropped below 0c for over 30mins overnight.
This is my automation, where am I going wrong?
When I run the automation the notification occurs as expected.
`alias: freezing
description: ''
trigger:

• platform: state
  entity_id: weather.home
  attribute: temperature
  from: '-20'
  to: '0'
  for:
  hours: 0
  minutes: 30
  seconds: 0
  condition:
• condition: time
  after: '00:00'
  before: '07:00'
  weekday:
  • mon
  • tue
  • wed
  • thu
  • fri
  • sat
    action:
• wait_for_trigger:
  • platform: time
    at: '07:00'
• service: notify.alexa_media_bedroom_echo_clock
  data:
  data:
  type: tts
  message: dee ice the car it was freezing last night
  target: alexa_media_bedroom_echo_clock
  mode: single
  `
  Thanks for any help offered