Suntime

From Tardis Wiki, the free Doctor Who reference

Suntime was one of two seasons, the other being Icetime, on Ribos. It lasted for approximately thirty-two Levithian years. This was due to Ribos having a highly elliptical orbit around its sun. At this time the planet was hot.

The Ribosians believed that the season was caused by the Sun Gods, who they thought were fighting over Ribos with the Ice Gods. (TV: The Ribos Operation)