Thermal screening masses of the conserved vector current are calculated both in a weak-coupling approach and in lattice QCD. The inverse of a screening mass can be understood as the length scale over which an external electric field is screened in a QCD medium. The comparison of screening masses both in the zero and non-zero Matsubara frequency sectors shows good agreement of the perturbative and the lattice results. Moreover, at $Tapprox 508mathrm{MeV}$ the lightest screening mass lies above the free result ($2pi T$), in agreement with the $mathcal{O}(g^2)$ weak-coupling prediction.
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