Travelers in the remote areas should be very careful at night or when stopped outside of town. Robbery is common in these areas. Roads may seem well paved but huge potholes, animals, people and large objects can be found around blind corners. There are televisions and big reclining seats and absolutely frigid air conditioning. The autobus is simply the best way to get around Mexico.
Air travel is pricey and major airports are only in the bigger cities.
Trains are romantic but in Mexico are always slower and more expensive than busses, frequently late, and often filthy. Same general conditions apply to Central Plateau. Along the Gulf of Mexico and Caribbean coasts, some rain can occur in December and January. Daytime temperatures in the 80's along the coasts all year around. Inland city temperatures get progressively milder according to altitude.