  We present results obtained in QCD with two flavors of non-perturbatively
improved Wilson fermions at finite temperature on $16^3 \times 8$ and $24^3
\times 10$ lattices. We determine the transition temperature in the range of
quark masses $0.6<m_\pi/m_\rho<0.8$ at lattice spacing a$\approx$0.1 fm and
extrapolate the transition temperature to the continuum and to the chiral
limits.
