"Wet seasons" or "cool seasons" don't apply everywhere, and "equinoctial seasons" blur into Winter. "Isothermal seasons"?
How about transitional seasons?
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"The tropical seasons are broken up into just two: the wet season and the dry season." - Don't they have Spring and Fall? – Cees Timmerman May 28 '14 at 9:58
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Correct, because a yearly season is not simply marked by Earth's angle regarding the sun. – Cees Timmerman May 28 '14 at 10:54
Equinoctial seasons is the most accurate; I checked the texts Google Ngrams found and all but "equinoctial seasons" were more about the weather than the time of year. "Isothermal seasons" was not found.
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