If your Clue Plus subscription ends, your Oura data will no longer sync with Clue and you won’t be able to view your Oura temperature trend charts.
When you resubscribe to Clue Plus again, any previous Oura data that had synced with Clue during your past subscriptions will be visible once more in your Analysis Tab charts (if it’s within the last six cycles). However there may be some missing data in your charts, from when your Clue Plus subscription was not active and data syncing from Oura to Clue was unable to occur.