The standard enthalpy of formation $\left(\mathrm{\Delta }{H}_f^{\circ }\right)\text{ at }398\mathrm{K}$ for methane, ${\mathrm{CH}}_4\left(g\right)$ is $74.8\mathrm{kJ}{\mathrm{mol}}^{-1}$ The additional information required to determine the average energy for $\mathrm{C}-\mathrm{H}$ bond formation would be 

the dissociation energy of hydrogen molecule, ${\mathrm{H}}_2$

latent heat of vaporisation of methane

the first four ionization energies of carbon and electron gain enthalpy of hydrogen.

the dissociation energy of ${\mathrm{H}}_2$ and enthalpy of sublimation of carbon