This type of climate is characterized by the coolest month having a
temperature of between -3 deg. and 18 deg. C. In the northeastern and central
parts of Tamaulipas, including the Sierra de Tamaulipas, Ciudad
Victoria, Gomez Farias, Rancho Pano Ayuctle, and Llera, the average
temperature of the warmest month is less than 22 deg. C.; the winters are
dry and not rigorous, and the wettest month has ten times as much rain
as the driest. In the Sierra San Carlos the average temperature of the
warmest month is less than 22 deg. C., and the rainy season is in the
autumn.