The offshore wind industry is growing into a more established sector with 5 GW installed capacity in UK waters. This is set to increase further in the UK and across Europe. With the development of the sector there has been an increased demand for, and ability to provide, better data. One method of obtaining data on wind resource is mathematical modelling. This does not replace the requirement for site specific measurements and monitoring. The Crown Estate identified the potential for improvement in understanding of the UK’s offshore wind resource that could be gained from such an update and the benefit that this could bring to the sector.Following a competitive tendering process The Met Office was awarded a contract by The Crown Estate to produce the UK Offshore Wind Dataset 2015.The new wind dataset has been produced at 110m above sea level at horizontal resolutions of 4.4km (over the Renewable Energy Zone (REZ) Waters). The dataset is based on 30 years of modelled 4.4km data (December 1984 - November 2014).