Boeing 767 -300 cf6-80
brw 150 tonnes
climb to FL 370
ISA +10> clb / 18 minutes over 115 miles
ISA +10> clb 2/ (reduced climb) 21 minutes over 132 miles
ISA +15 clb / (fulll climb ) 20 minutes over 130 miles
ISA +15 clb 2 / 24 minutes over 151 miles
ISA +20 clb / 23 minutes over 155 miles
ISA +20 clb 2 / 27 minutes over 179 miles
clb2 represents a 20% thrust deduction to 10,000 feet decreasing linearly to Max climb thrust at FL 300
I think it is then fair to say that a 5'C rise in temperaure equals a 20% or greater loss of thrust available, and visa versa.