The levelized costs of energy (LCoE) of wavepower is still not fully competitive with other sourcesof renewable energy. However, wave energy is partlyin a different phase than other renewable energy typesand could thus contribute to a better predictability andsmoothed power output. This work focuses on co-locationof wave and wind power by investigating the intermittencyof wind and waves power based on measured historicaldata from several hundreds of locations worldwide. Employingwind power curves and wave power matrices, thesites are evaluated based on several different metrics. Theresults indicate that there are several spots where wavepower has a much lower intermittency than wind powerproviding reliable energy supply. Best sites for co-locationin terms of energy yield was found in North-WesternEurope. However, both wind and wave production have thesame seasonal variability in these sites. Only a handful ofsites found in California showed the possibility of seasonalpower smoothing using the combination of wind and wave.