This report is a follow-on to ARP1420 and AIR1419 documents issued by the SAE S-16 Committee on spatial total-pressure distortion. These previous documents addressed only total-pressure distortion and excluded temperature distortion. The subject of inlet temperature distortion is addressed in this report with some background and identification of the problem area. The status of past efforts is reviewed and an attempt is made to define where we are today. Deficiencies, voids, and limitations in knowledge and test techniques for temperature distortion are identified. Suggested approaches to fill these voids and a proposed temperature distortion methodology are presented. Successful techniques, employed to date, are reviewed and recommendations for future research work are indicated.