Based on the Yeshiva at which I currently teach, as well as on other places which I have researched, starting in the mid-thirties for teaching half a day is pretty common.
Some places do offer full-time jobs, with other classes or responsibilities in the afternoons.
Not all Yeshivos (perhaps not even most) give regular raises.
An important variable which can affect the real value of the salary is whether the school pays on time.
Of course tuition, health insurance and other benefits are factors that vary from school to school.