Although I do not know from experience, in The Care and Breeding of Chameleons Vol. 1 Ferguaon and Vosjoli suggest for Veilds 80-88F during the day and a nightly drop to a low of 74F at night. Using this method the babies are expected to hatch in approximatley 150-190 days. They continue describing three test incubation groups all placed close together:
Group 1: was 80-88F day with a temp drop reaching a low of 74 in the evenings.
Group 2: was constantly at 82
Group 3: was constantly at 92
Group 1, with the nightly temp drop hatched first, then Group 2, hen Group hatched last. Does anyone else know if this is preferable from experience?