The Thiokol engineers had also argued that the low overnight temperatures of 18 °F (−8 °C) the evening prior to launch would almost certainly result in SRB temperatures below their redline of 39 °F (4 °C).
Para insinyur di Thiokol juga berpendapat bahwa semalam suhu rendah (18 °F (-8 °C) pada malam sebelum peluncuran) akan hampir pasti menghasilkan suhu BPRS bawah redline mereka 40 °F (4 °C) .