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CanvasJS accepts only numeric or dateTime in x-values and numeric in y-values. Assigning numeric values to time and temperature values of point array $point = array("time" => $row['time'] , "temperature" => $row['temperature']); , should work fine in your case.

If this doesn’t solve your issue, kindly create a sample project reproducing the issue you are facing and share it over Google-Drive or Onedrive along with the sample database, so that we can look into your code, understand it better and help you out.

Priyanka M S
Team CanvasJS