I think travelers miss a lot by automatically barring Mexico May to November. Navegator can comment about the air being significantly less polluted in the big Enchilada. Elevations of 5,000 ft or higher are significantly cooler and drier.
The big difference on the coast is that washed-out winter green scenery becomes vibrant green. There is less threat of an actual hurricane strike than on the Baja peninsula. In Las Penas August temps for surface seawater commonly reaches 86F.
Stores are just jam packed with tropical fruit. And I'll bet the Talleyho Family are just loving that. Many times zapote borrachos become available in the MEGA. Another fruit to try is the YACA or LLACA. Tomorrow I'll be in an area where I speak Spanish and they answer in English. Goodbye tropics for two weeks :(