The annual mean temperature for the lands less than 1000 meters in
elevation, which make up most of the state, is between 20 deg. and 25 deg. C.;
and the difference in monthly means is 5 deg. C.
In the areas above 1000 meters, the annual mean is between 15 deg. and 20 deg.
C., and the difference in the monthly means is 15 deg. C.
The maximum temperature recorded in the state is 45 deg. C. in the region
of Ciudad Victoria, between the Sierra Madre Oriental, the Sierra San
Carlos, and the Sierra de Tamaulipas. Minima recorded are between O deg.
and 5 deg. C. on the southeastern coast, O deg. to -5 deg. C. between 98 deg. 20' long.
and 99 deg. 00' long., and -5 deg. to -10 deg. C. in the Sierra Madre Oriental.